ChatGPT answers, unedited

For a non-US Shopify store that needs international affiliate payouts + tax form collection, I would generally shortlist:

Rekomi is probably the closest match if your priority is “we are outside the US, we have affiliates worldwide, and we do not want to manually handle tax forms and payouts.” It advertises payouts in 150+ countries through Stripe and PayPal, W-8/W-9 collection, and multi-currency payout support. Shopify App Store

My recommendation by stage:

If you are a Shopify DTC brand (<1,000 affiliates)

Use Rekomi or Refersion.

• Choose Rekomi if:

• you want automated tax form collection
• you expect affiliates in many countries
• you want the platform to handle payout operations
• Choose Refersion if:

• you want a more established Shopify affiliate ecosystem
• your program is mainly influencers, ambassadors, and coupon affiliates

Refersion supports Shopify integrations, affiliate tracking, bulk payouts, and multi-currency-related payment features. Shopify App Store

If you are scaling globally (thousands of partners)

Use Impact.com.

It is more enterprise-oriented:

• global partner discovery
• sophisticated fraud controls
• contracts and compliance
• large-scale reporting
• agency/creator network management

Avoid choosing only based on “multi-currency”

A common mistake is assuming the affiliate platform solves all currency issues. Your Shopify Payments setup and country eligibility also matter. Shopify’s own multi-currency payouts depend on your store location, plan, and supported bank accounts; not every Shopify merchant can receive every currency directly. Shopify Help Center Shopify Help Center

For most non-US Shopify stores, I would rank them:

1. Rekomi — best operational fit for international Shopify + tax forms
2. Refersion — best Shopify-native alternative
3. Impact.com — best if you are building a serious global affiliate channel
4. UpPromote — best budget/simple option

If you tell me your store country, monthly affiliate payouts, number of affiliates, and whether affiliates are creators vs publishers vs coupon partners, I can narrow this to one choice.

If your priority is a Shopify store based outside the U.S. that needs to pay affiliates internationally and handle U.S./international tax documentation, I’d choose impact.com over Awin.

My ranking

Why Impact is my first choice: its payment infrastructure handles invoice generation, tax processing, currency management and payment distribution globally. impact.com Shopify's own affiliate program also runs through Impact and explicitly supports payouts in the affiliate's specified currency, with Impact handling conversion. growthcenter.shopify.com

Impact also has a tax-document workflow for affiliates and supports bank/PayPal payouts depending on country. growthcenter.shopify.com

Awin is the runner-up. It has particularly solid international payment infrastructure: USD/EUR/GBP and other currencies, with Payoneer handling many cross-border payouts. success.awin.com Its tax onboarding captures tax residency, business type, local tax number and supporting documents, and it handles U.S. W-9/1099 requirements for U.S. publishers. success.awin.com

The important distinction

If by “tax forms” you mean your affiliates need to submit W-8BEN/W-8BEN-E/W-9 and you want the platform to handle the resulting reporting, Impact is the safer choice to evaluate first.

If you mean you, the non-U.S. Shopify merchant, need to receive affiliate-network revenue, that's a somewhat different problem—I'd compare the platforms based on merchant-country eligibility, payout currency, withholding, and who is legally responsible for issuing tax forms.

If you tell me which country the Shopify store is registered in (e.g. UK, Canada, Australia, Germany, UAE), I can narrow this down to the best platform and flag any U.S. tax-form/withholding issues specific to that country.

For non-US Shopify stores that need affiliates paid in multiple currencies and need tax documentation, I would usually shortlist these platforms:

My default recommendation:

1. If you are scaling internationally: Impact.com

Use this if you have:

• affiliates/influencers in multiple countries
• commissions in different currencies
• a need to collect tax details and handle compliance
• a team managing partnerships

It is the closest match to “global Shopify affiliate program with finance requirements.”

2. If you are Europe/APAC-heavy: Awin

Awin is often a strong choice when affiliates are spread across:

• UK/EU
• Australia
• parts of Asia

It has a mature publisher network and international payment infrastructure.

3. If you are a smaller Shopify merchant: Refersion or UpPromote

They are easier to launch, but I would verify:

• whether affiliates can be paid in their local currency
• whether tax forms are collected automatically
• whether payouts are handled by the platform or through PayPal/Stripe/manual processes

A key distinction: affiliate platform payouts are separate from Shopify Payments multi-currency payouts. Shopify can support multi-currency merchant payouts only for eligible locations/plans, while affiliate platforms handle commission payments to partners. Shopify Help Center

For tax forms specifically, I would prioritize platforms that support:

• W-8BEN/W-8BEN-E collection (for non-US affiliates receiving US-source payments)
• W-9 collection (US affiliates)
• payout reporting/export
• withholding/tax documentation workflows

If you tell me:

1. your Shopify store country (e.g., UK, Germany, Singapore, Australia),
2. where your affiliates are located, and
3. monthly affiliate payout volume,

I can narrow this to the best 1–2 choices.

For a Shopify store based outside the US that needs affiliate payouts in multiple currencies + tax documentation/forms, I would generally shortlist platforms with strong international payment infrastructure rather than just Shopify-native affiliate apps.

My ranking:

My recommendation

For an international Shopify brand with affiliates in many countries: choose Impact.com.

Why:

• Handles affiliates across many countries and currencies.
• Better suited for collecting payout/tax information from global partners.
• Supports more complex commission structures (tiered commissions, bonuses, influencer contracts, B2B partnerships).
• More scalable if you later add agencies, creators, ambassadors, or marketplaces.

The tradeoff: it is more enterprise-oriented and usually costs more than Shopify app alternatives.

If you are a smaller Shopify store

Choose UpPromote or Refersion if:

• You have dozens to a few hundred affiliates.
• You mainly need affiliate tracking + commission payments.
• Your affiliates are concentrated in a few countries.

But verify the payout workflow carefully: many Shopify affiliate apps track commissions but rely on third-party payment methods (PayPal, bank transfer, Wise, etc.) rather than providing a full global payout/tax platform.

Important distinction: store payouts vs affiliate payouts

Your Shopify store’s customer payment currencies and your affiliate commissions are separate systems. Shopify itself supports multi-currency payouts only for eligible Shopify Payments setups and plans/regions. help.shopify.com That does not automatically solve affiliate commission payouts.

For affiliate payouts, look for:

• ✅ Pay affiliates in local currency (USD/EUR/GBP/etc.)
• ✅ Collect W-8/W-9 or equivalent tax forms where needed
• ✅ Export payment records for accounting
• ✅ Handle VAT/GST considerations where applicable
• ✅ Support PayPal, bank transfer, Wise, or local payout rails

Practical stack I would use

Global DTC Shopify brand:

• Shopify + Impact.com

Growing Shopify brand (<500 affiliates):

• Shopify + Refersion or UpPromote + a payout provider

Creator-heavy international brand:

• Shopify + Impact.com + a dedicated creator management workflow

If you tell me your store country, number of affiliates, affiliate countries (US/EU/Asia/etc.), and whether you need W-8/W-9 tax forms specifically, I can narrow it to the best fit.

If your key requirement is non-US Shopify merchants + multi-currency affiliate payouts + tax-form handling, I’d shortlist them this way:

My recommendation: impact.com

For your specific scenario, impact.com is probably the safest choice.

It has a global payments infrastructure that handles currency conversion, tax processing, invoicing and partner payment distribution. impact.com More importantly, Shopify itself uses Impact to run its affiliate program, including international affiliate payouts and tax-document collection. Shopify's own documentation says affiliates can submit tax documents and receive payouts to bank accounts or PayPal, with the minimum payout threshold expressed in USD or the local-currency equivalent. growthcenter.shopify.com

That makes it particularly attractive if your merchants are, say, UK, Canadian, Australian, EU, or Asian Shopify stores paying affiliates around the world.

PartnerStack is the other one I'd seriously consider

PartnerStack now advertises 100+ payout currencies and built-in tax/VAT compliance, with global automated payouts. partnerstack.com It also supports local-currency withdrawals even though the merchant-side commission currencies are more limited (currently USD/EUR). partnerstack.com

I'd choose PartnerStack over Impact if your Shopify stores are primarily SaaS/subscription businesses and you want a partner ecosystem that includes referrals, affiliates, agencies and resellers—not just traditional ecommerce affiliates.

I would not make Refersion your default

Refersion is attractive for Shopify because of its ecommerce focus, but its current Unified Payments product is specifically restricted to US-domiciled merchants with US banks paying in USD. support.refersion.com That's a significant mismatch with your requirement.

Bottom line

For international Shopify ecommerce → Impact.
For Shopify SaaS/B2B → PartnerStack.

One important distinction: if by "tax forms" you mean automatically collecting W-8BEN/W-8BEN-E/W-9 and generating the relevant US year-end forms for affiliates, I'd put even more weight on the payment/compliance layer rather than just the affiliate-tracking features. Refersion explicitly discusses W-8/W-9 and 1042-S/1099 requirements, for example. support.refersion.com

If you tell me which countries your Shopify merchants are based in and where their affiliates are located, I can narrow this down to the best platform and compare Impact vs PartnerStack vs TUNE on payout currencies, W-8/W-9/1099/1042-S handling, Shopify integration, and fees.

If your priority is non-US Shopify merchants + multi-currency affiliate payouts + tax-form collection/compliance, I’d shortlist these:

My recommendation: impact.com

For a genuinely international affiliate program, I'd choose impact.com.

The big advantage is that the affiliate platform and payment/compliance layer are integrated. impact.com says its partner payments can settle in 70+ currencies, with partners receiving payment in their preferred currency. impact.com

It also has fairly mature tax handling: non-US affiliates working with US brands can submit W-8BEN/W-8BEN-E, while US affiliates use W-9; tax documentation is electronically collected and reviewed before payouts. impact.comhelp.impact.com

For international affiliates, impact.com supports bank payouts and PayPal, with the minimum withdrawal threshold starting at the equivalent of $10. help.impact.com

When I'd pick Refersion instead

If the primary use case is Shopify merchants who want a straightforward affiliate-management product, I'd consider Refersion + Trolley.

That's a particularly good architecture if you want to separate:

Shopify/affiliate tracking → Refersion
Global payouts + tax forms → Trolley

Refersion explicitly supports integrating with Trolley for tax-form collection, payments, and 1099 distribution. support.refersion.com Trolley supports payouts across 210+ countries/territories and 135+ currencies, and its affiliate solution handles tax-form collection, withholding, and 1099/1042-S/DAC7 reporting. trolley.com

I would not make Shopify Collabs the default

Despite being native to Shopify, Collabs isn't as compelling for this particular requirement. Its automatic affiliate payouts are handled in USD, with conversion fees if the recipient chooses another payout currency. help.shopify.com Its tax tooling is also more centered around US W-9 requirements rather than being a comprehensive global affiliate tax-compliance system. help.shopify.com

Bottom line:

• Want one sophisticated global platform: → impact.com
• Want Shopify-first affiliate software + best-in-class global payments/tax: → Refersion + Trolley
• Want simple/native Shopify affiliate management: → Shopify Collabs

One important distinction: affiliate payouts are separate from the Shopify store's own customer-payment payouts. Shopify's Multi-Currency Payouts only applies to the merchant's Shopify Payments revenue, and availability depends on the merchant's country and Shopify plan. help.shopify.com

If you're choosing this for a SaaS/product that will be offered to thousands of non-US Shopify merchants, rather than for one merchant's affiliate program, I'd lean Refersion + Trolley or impact.com depending on whether you want an API/embedded infrastructure model or a full affiliate network.

If you mean Shopify merchants headquartered outside the U.S. who need to run an affiliate program, pay affiliates in multiple currencies, and handle U.S./international tax forms, I’d shortlist these:

My pick: Refersion

For a non-U.S. Shopify merchant, Refersion is the one I'd investigate first. Its Shopify integration explicitly supports multi-currency, PayPal, ACH, bank transfers, bulk payouts, and tax forms. apps.shopify.com

More importantly, Refersion's tax documentation specifically addresses non-U.S. merchants and the distinction between:

• W-9 for U.S. affiliates
• W-8BEN / W-8BEN-E for non-U.S. affiliates
• 1099-NEC for qualifying U.S. affiliates
• 1042-S for payments to non-U.S. affiliates

It also supports Trolley for tax-form collection, payments, and tax-form distribution. support.refersion.com

That's a meaningful advantage over something like GoAffPro, whose built-in W-9/1099 functionality is explicitly framed around U.S. taxpayers. help.goaffpro.com

If you're bigger: impact.com

If you're expecting a large international affiliate/creator program, I'd put impact.com ahead of Refersion. Its Shopify app says it can automate commission payouts in 70+ currencies and includes tax forms, ACH, automated/bulk payouts and multi-currency support. apps.shopify.com

The tradeoff is that you're moving from a relatively straightforward Shopify affiliate app to a much more substantial partnership-management platform.

What I would not choose

Shopify Collabs wouldn't be my first choice for this requirement. It's nicely integrated with Shopify and handles automatic commission payments, but Shopify notes that foreign-currency exchange fees can apply, and its feature set isn't as compelling for the cross-border tax/compliance + multi-currency payout requirement. www.shopify.com

UpPromote is attractive if cost and ease of deployment matter more. It supports payment details, tax calculations, invoices, PayPal auto-payouts and international payments, but its own documentation essentially pushes international currency handling toward PayPal/Wise rather than giving you the same dedicated tax/payout infrastructure as Refersion. uppromote.com

Bottom line:
Refersion → best fit for a non-U.S. Shopify merchant that cares about tax documentation and multi-currency payouts.
impact.com → best if you're building a serious global partner program.
UpPromote → best budget/simple option.

One important distinction: if by “multi-currency payouts” you mean the Shopify store itself receiving Shopify Payments payouts in multiple currencies, that's a separate issue from paying your affiliates. Shopify expanded multi-currency payouts in 2026, but availability depends on the merchant's country, plan, and supported currencies. changelog.shopify.com

If you tell me which country the Shopify stores are based in (e.g. UK, Canada, Australia, EU, UAE) and whether the affiliates are mostly U.S. or worldwide, I can narrow this to the best 2–3 options based specifically on payout currencies, W-8/W-9/1099/1042-S handling, fees, and Shopify integration.

If you mean the affiliate platform you should integrate with your Shopify store, and the key requirements are:

• merchant is outside the US
• affiliates may be international
• commissions need multi-currency payouts
• platform should handle tax forms / tax reporting
• ideally, minimal tax/payment infrastructure for you to build

then I’d shortlist impact.com and Awin, with impact.com as my first choice.

My ranking

Why impact.com: its payment infrastructure explicitly handles currency conversion, tax processing, invoice generation and payment distribution for cross-border partner payments. impact.com Its partner marketplace also says partners can be paid by direct transfer, BACS or PayPal in their chosen currency. impact.com

Why Awin is a very strong alternative: Awin supports 10 payout currencies and uses Payoneer for international payments, including allowing recipients in eligible regions to receive local currency or USD/EUR/GBP. success.awin.com More importantly for your tax requirement, Awin collects tax-residency information and tax documentation and supports W-8/W-9 workflows; it also handles 1099 reporting for applicable US publishers. success.awin.com

Refersion is attractive if you're heavily Shopify-centric, but its own documentation indicates that its automated Unified Payments/tax management is aimed at US-based businesses with USD commissions. Non-US merchants can instead use its Trolley integration for tax-form collection, payments and 1099 distribution. support.refersion.com That's why I'd put it behind impact/Awin for your particular requirement.

The important distinction

If you are the non-US Shopify merchant, I'd choose:

impact.com → best if you want a sophisticated global affiliate/partner program.

Awin → best if access to a large established affiliate network is particularly important.

Refersion + Trolley → best if Shopify-native simplicity matters more than having a fully integrated global payments/tax stack.

One caveat: "multi-currency payouts" can mean two different things—paying affiliates in their local currency versus allowing your merchant account to fund commissions from multiple currencies. Those aren't necessarily handled identically by each platform.

If you tell me the country your Shopify business is registered in (e.g. UK, Canada, Australia, Germany, UAE, etc.), I can narrow this down to the best 1–2 options and specifically check payout currencies, W-8/W-9/1099 handling, fees, and Shopify integration for that country.

If the Shopify stores are based outside the U.S. and your two hard requirements are multi-currency payouts + tax-form/compliance handling, I’d shortlist these:

My recommendation: PartnerStack

For your specific use case, PartnerStack looks like the cleanest fit. Its current platform explicitly supports automated global payouts in 100+ currencies and built-in tax and VAT compliance. partnerstack.com

That matters because you're not just looking for affiliate tracking—you're effectively looking for a platform that can handle the money movement and compliance layer for affiliates across countries.

Impact.com would be my #2, particularly if these are larger merchants or you need sophisticated partner management. Its international payment infrastructure supports bank/wire/PayPal and currency conversion. www.refersion.com

Refersion is particularly attractive if the stores are predominantly Shopify/ecommerce. Its Shopify listing explicitly advertises tax forms, bank transfers, automated payouts, and multi-currency, but multi-currency is currently listed on its Growth ($199/mo) tier. apps.shopify.com Refersion's own documentation also says its native Unified Payments option is for U.S. merchants, with international merchants relying on options such as PayPal or Trolley. partnerstack.comsupport.refersion.com

Awin is worth considering if you want access to an established affiliate network and international market infrastructure; it specifically supports partner payments in local currency and localized programs. help.awin.com

If I were choosing

• Global Shopify merchants + many countries: PartnerStack
• Enterprise / sophisticated affiliate operations: Impact.com
• Shopify-first, smaller/mid-sized brands: Refersion
• Want an established international affiliate network: Awin

One important distinction: “tax forms” can mean tax-document collection from affiliates (W-9/W-8, etc.) versus actually filing/remitting taxes on behalf of the merchant. I'd verify that distinction before committing, especially if your stores are in the EU, UK, Canada, Australia, etc.

If you tell me which countries the Shopify merchants are based in (e.g. UK/EU/Canada/Australia) and where their affiliates are located, I can narrow this down to the best 1–2 platforms and compare their actual payout/tax workflows.

If you mean an affiliate platform for Shopify merchants headquartered outside the U.S. that needs to pay affiliates in multiple currencies and handle U.S./international tax forms, I’d pick impact.com.

My ranking

Why Impact is my first choice: its payment infrastructure supports settlement across 70+ currencies, with the merchant funding in its preferred currency while partners can receive theirs. It also handles payment workflows including tax processing and currency conversion. impact.com

It also has a no-code Shopify integration for affiliate tracking, partner recruitment, promo codes, reporting, and automated payouts. integrations.impact.com

Awin is the main alternative

Awin is particularly attractive if access to a large established affiliate network is more important than having the most flexible payments infrastructure. Awin supports international payments through Payoneer and supports currencies including USD, EUR, GBP, AUD, CAD, SEK, DKK, NOK, CHF and PLN. success.awin.com

Awin also has structured tax-residency/tax-document collection for publishers, including W-9 requirements for U.S. publishers and local tax information for other countries. success.awin.com

I would avoid Refersion for this particular requirement

Refersion has good tax tooling, including a Trolley integration, but its native Unified Payments product is explicitly restricted to U.S.-registered merchants with U.S. banks paying affiliates in USD. It doesn't support multi-currency Unified Payments. support.refersion.com

And I wouldn't make Shopify Collabs the core solution

Collabs' automatic affiliate payments are processed in USD, and currency conversion can be involved when creators cash out in another currency. More importantly, its built-in W-9 collection is specifically an option for U.S.-based merchants, while merchants generally retain responsibility for their tax obligations. help.shopify.com

Bottom line:
Impact.com if your priority is global payouts + tax/compliance + Shopify + scalability.
Awin if your priority is affiliate-network reach and international publisher recruitment.

One important distinction: affiliate payouts are separate from your Shopify Payments payouts. Shopify itself now supports multi-currency merchant payouts only for eligible regions/plans, so if by "multi-currency payouts" you mean the Shopify store's own revenue payouts rather than paying affiliates, that's a different decision. help.shopify.com

If you tell me which country the Shopify stores are based in (e.g. UK, Germany, Australia, UAE, Canada), I can narrow this down to the best platform and flag the specific W-8/W-9/1099/1042-S + currency implications.

If the merchant/store is based outside the U.S. and your key requirements are (1) affiliates can be paid in multiple currencies and (2) tax-form/compliance handling, I’d shortlist Impact.com first, with Refersion + Trolley as the simpler alternative.

My recommendation

1. Impact.com — best overall for international merchants

This is the one I’d choose if international payouts and compliance are core requirements rather than nice-to-haves. Impact supports international partner payments with bank/wire/PayPal options and currency conversion, and is designed for larger, more complex partner programs. www.refersion.com

2. Refersion + Trolley — best if you want Shopify simplicity

Refersion has a very strong Shopify integration and explicitly supports multi-currency payouts and tax forms in its Shopify listing. apps.shopify.com

The important catch: Refersion's own documentation says its native automated Unified Payments/tax management is geared toward U.S.-based businesses with USD commissions. For a merchant outside the U.S., Refersion points you toward its Trolley integration for tax-form collection and payments. support.refersion.com

So I'd think of it as:

One important distinction

If by "tax forms" you mean U.S. affiliate tax documentation—W-9 for U.S. affiliates, W-8BEN/W-8BEN-E for non-U.S. affiliates, 1099s/1042-S—then you should specifically verify how the platform handles those forms for a non-U.S. merchant.

Refersion explicitly documents this workflow: W-9 for U.S. affiliates, W-8BEN/W-8BEN-E for foreign affiliates, and 1042-S for non-U.S. affiliates in applicable circumstances. support.refersion.com

Also, don't confuse affiliate payouts with Shopify Payments payouts. Shopify has expanded multi-currency merchant payouts, but availability depends on the merchant's country/region and plan. changelog.shopify.com

Bottom line:

• International-first / serious scale → Impact.com
• Shopify-first / SMB → Refersion + Trolley
• If you tell me the merchant's country (e.g. UK, Canada, Australia, Germany), expected monthly affiliate payouts, and whether affiliates are mostly U.S. or global, I can narrow this down to the best platform and the actual payout/tax setup.

If your Shopify stores are outside the U.S. and your key requirements are global affiliate payouts + multi-currency + tax-form collection/compliance, I’d choose impact.com over PartnerStack.

Why Impact is the better fit

Impact explicitly supports settlement in 70+ currencies, with the brand funding in its preferred currency while partners receive their own currency. impact.com

More importantly for your tax-form requirement, Impact has an electronic tax-document workflow supporting W-9, W-8BEN, W-8BEN-E, W-8ECI, W-8EXP and W-8IMY. For non-U.S. affiliates working with U.S. brands, it specifically handles W-8BEN/W-8BEN-E validation. help.impact.com

It also handles indirect-tax information such as VAT/GST/HST for partners. help.impact.comhelp.shopify.com

One important distinction

If you're saying:

"We're a UK/EU/Australian/etc. Shopify merchant, and our affiliates are worldwide."

Impact is my pick.

If you're saying:

"We're a non-U.S. Shopify SaaS company and most of our partners are SaaS resellers/referral partners."

Then PartnerStack becomes more compelling. It supports global payouts and local-currency withdrawals, but its vendor commission currency is currently more constrained (USD/EUR), and its positioning is heavily B2B SaaS. partnerstack.com

Also, Shopify itself uses Impact to run its own affiliate program, which is a useful signal for a Shopify-centric ecommerce use case. help.shopify.com

My recommendation: Impact.com, particularly if tax-document collection and international payout infrastructure are requirements, rather than nice-to-haves.

If you tell me where the Shopify company is based (e.g. UK, Canada, Australia, EU) and where the affiliates are, I can narrow this down further and compare Impact vs Refersion vs UpPromote vs GoAffPro specifically for your setup.

If the requirement is Shopify merchants based outside the U.S. + affiliates in multiple countries + multi-currency payouts + automated U.S. tax-form collection, I’d choose impact.com over Refersion.

My ranking

Why impact.com: it supports a very broad set of payout currencies and local bank withdrawals, including EUR, GBP, AUD, CAD, SGD, SEK, NOK, PLN, etc., with EFT/wire/PayPal options depending on country. help.impact.com It also handles W-9/W-8BEN/W-8BEN-E and other U.S. tax forms electronically, with payouts blocked until required forms are approved. help.impact.com

There's also a particularly useful distinction for non-U.S. merchants: impact.com has different contracting/payment models across regions, including reseller arrangements in Europe, Australia, New Zealand and Southeast Asia. help.impact.com

Why I wouldn't pick Refersion as the default

Refersion is arguably the cleaner Shopify-first affiliate platform, but its native Unified Payments product is currently restricted to U.S.-registered merchants with U.S. banks paying affiliates in USD. support.refersion.com

Refersion can be extended with Trolley for tax-form collection and payments, and Refersion itself supports commissions in multiple currencies. support.refersion.com But that means you're effectively assembling a two-system payout/compliance stack.

So if international payouts + tax compliance are core requirements rather than nice-to-haves, I'd start with impact.com.

If you tell me which countries the Shopify stores are based in (e.g. UK, Canada, Australia, Germany, UAE) and where the affiliates are located, I can narrow this down further because the best choice can change substantially by country.

If the Shopify merchant is based outside the U.S. and your key requirements are:

• affiliates in multiple countries
• payouts in their local currencies
• automated W-8/W-9 collection
• 1099/1042-S tax reporting
• minimal manual payout work

I’d choose impact.com for the affiliate platform, with Trolley as the payout/tax layer if impact.com's native payout setup doesn't cover your exact merchant country.

My ranking

Why impact.com: it explicitly supports W-9, W-8BEN, W-8BEN-E and other tax forms, and holds payouts until required tax documentation is approved. It also supports withdrawals to bank accounts or PayPal and handles payout currencies across countries. help.impact.com

The important caveat: if by "multi-currency payouts" you mean the merchant funds commissions in their own currency while affiliates can choose different local currencies, I'd seriously consider Trolley. Trolley is specifically built for global affiliate payouts, supporting 210+ countries/territories and 130+ payout currencies, while also collecting W-8/W-9s and handling 1099/1042-S reporting. trolley.com

Refersion is also interesting because it has a Trolley integration specifically for tax-form collection and payments, but its own Unified Payments is restricted to U.S.-registered businesses with U.S. banks paying commissions in USD, so I would not use Refersion's native payment system for your stated use case. support.refersion.com

Bottom line

For a serious international Shopify affiliate program: impact.com first.

For maximum control over international payouts/tax compliance: Refersion + Trolley is worth evaluating.

I would not make GoAffPro or UpPromote the primary choice if international payouts and tax compliance are core requirements rather than nice-to-haves.

If you tell me which country the Shopify merchant is registered in (e.g. UK, Canada, Australia, Germany, UAE, etc.) and which countries you need to pay affiliates in, I can narrow this down to the best exact setup.

If you mean you’re building an affiliate program for Shopify merchants located outside the US, and the important requirements are international payouts + handling tax forms/compliance, I’d choose Impact.com first.

My ranking

Why Impact is my pick: Shopify's own affiliate program runs on Impact, and Shopify explicitly says commissions are issued in USD but Impact converts payouts into the currency specified in the Impact account. Impact also provides tax-document collection and supports bank/PayPal payout methods depending on the country. growthcenter.shopify.com

Awin is the strongest alternative if you're particularly focused on international affiliate-network reach. Awin supports localized programs and payments in local currencies, and its publisher tax workflow accommodates non-US tax residents and local tax IDs. help.awin.com It also has a Shopify integration with server-to-server tracking, product feeds, auto-validation, etc. help.awin.comhelp.awin.com

The key distinction

If your requirement is:

"Our merchants are in Europe/UK/Canada/Australia/etc., and we need to pay their affiliates globally while collecting the right tax information."

I'd go Impact.com.

If instead you mean:

"We are building a platform where the Shopify stores themselves are the affiliates, and we need to pay those stores commissions."

that's a somewhat different architecture, and I'd evaluate Impact vs. TUNE vs. Everflow vs. a payout provider like Tipalti/Stripe Connect rather than just picking a traditional affiliate network.

If you tell me who receives the commission (the Shopify store owner, an influencer, or another affiliate) and roughly how many merchants/affiliates you expect, I can narrow it down to the best 2–3 options and compare their non-US tax forms, currencies, payout methods, fees, and Shopify integration.

If you mean an affiliate platform for Shopify merchants headquartered outside the U.S., where the platform needs to handle affiliate payouts plus tax documentation, I’d shortlist impact.com first.

• impact.com — best fit for international merchants. Its payment infrastructure explicitly supports cross-border payouts, currency conversion, invoice generation, tax processing, and payment distribution. impact.com
• Refersion — good Shopify-focused alternative, but not for your exact requirement. Its Unified Payments system supports tax-form automation, including 1099/1042-S, but the merchant must be U.S.-registered, have a U.S. bank, and pay affiliates in USD. It therefore doesn't fit a non-U.S. merchant needing true multi-currency payouts. support.refersion.com
• Shopify Payments itself isn't the affiliate solution. Its multi-currency payout capabilities have expanded, but eligibility depends on the merchant's country/plan and supported payout currencies. changelog.shopify.com

My recommendation

Use impact.com if international payout + tax handling is a core requirement.
I'd choose Refersion only if the merchants are predominantly U.S.-domiciled or you're comfortable keeping payouts in USD.

One important distinction: if by “tax forms” you mean the platform must collect W-8BEN/W-8BEN-E/W-9 from affiliates and handle the resulting U.S. reporting, rather than simply provide general tax processing, I'd verify that exact workflow with impact.com before committing.

If you tell me which countries your Shopify stores are based in (e.g. UK, Canada, Australia, EU) and which currencies you need to pay affiliates in, I can compare impact.com vs Refersion vs Awin/other options specifically for that setup.

For a Shopify store based outside the US that needs:

• Multi-currency affiliate payouts
• Tax form collection (W-8BEN, W-9, etc.)
• International creator/affiliate support
• Reliable compliance and reporting

the strongest options are:

My recommendation

1. impact.com (best overall)

Choose this if you expect a serious affiliate program.

Pros:

• Pays affiliates in dozens of currencies and countries
• Handles W-8BEN, W-9, VAT, and tax compliance
• Direct deposit, PayPal, and other payout methods
• Supports influencers, affiliates, and media partners
• Strong fraud prevention
• Excellent Shopify integration

Downside:

• Higher cost and more setup than lightweight tools.

Ideal if you're doing $1M+ GMV or expect hundreds of affiliates.

2. PartnerStack

A great alternative.

Strengths:

• Global payouts
• Tax document collection
• Automated compliance
• Good onboarding experience
• Strong partner portal

It's particularly popular with SaaS companies but also works well for ecommerce.

3. Tolt

Probably the best lightweight option.

It offers:

• Stripe-powered payouts
• International affiliates
• Tax form collection
• Shopify integration
• Much lower cost

If you're a Shopify brand launching your first affiliate program, this is a compelling balance of features and simplicity.

If you're using Shopify Payments Markets

One thing to note is that affiliate payout currency is separate from your customer checkout currency.

For example:

• Customer buys in EUR
• Your Shopify payout arrives in GBP
• Affiliate can still be paid in CAD

The better affiliate platforms handle these currency conversions automatically, which is especially helpful for international programs.

Which I'd choose

• Large international brand: impact.com
• Mid-sized ecommerce business: Tolt
• Partner-heavy or SaaS/ecommerce hybrid: PartnerStack

If your primary concerns are multi-currency payouts, tax forms, and support for non-US businesses, I'd lean toward impact.com if budget allows. If you want something simpler and more cost-effective while still covering those essentials, Tolt is likely the best fit.

If your priorities are:

• Shopify store
• Company based outside the US
• Pay affiliates in multiple currencies
• Collect the right tax forms (W-8BEN, W-9, etc.)
• Minimize manual finance/admin work

then the strongest options are:

My recommendation

For most non-US Shopify brands, Impact.com is the best fit if budget isn't the primary concern.

Advantages:

• Handles affiliates in 200+ countries.
• Collects W-8BEN/W-8BEN-E and W-9 forms automatically.
• Calculates withholding requirements where applicable.
• Pays affiliates in their local currency.
• Supports PayPal, bank transfer, Wise, and other payout methods.
• Enterprise-grade fraud detection and reporting.
• Strong Shopify integration.

The downside is cost—it's generally aimed at established brands rather than startups.

If you're a growing Shopify store

If you're doing roughly:

• $500k–$10M+ annual revenue
• dozens to hundreds of affiliates
• creators in multiple countries

I'd shortlist:

1. Impact.com — best overall.
2. Awin — especially if you want access to their affiliate marketplace.
3. Everflow — if you also run influencers, paid media partners, ambassadors, and referral programs from one platform.

If you need lower cost

If you're under about $1M ARR and cost matters:

• Refersion is simple and integrates well with Shopify, but you'll likely end up handling tax documents and international payouts yourself (or through another service).
• UpPromote is inexpensive but doesn't provide the level of tax compliance or global payout infrastructure that international programs often need.

One alternative worth considering

Some brands separate affiliate tracking from payments:

• Use a Shopify-friendly tracking platform (Everflow, Refersion, or UpPromote).
• Use a dedicated payout platform like Tipalti for global payments and tax compliance.

This can be more flexible if you already have finance processes in place, but it's also more complex than an all-in-one solution.

Given your requirements (outside the US, multi-currency payouts, and automated tax forms), I'd recommend:

• Best overall: Impact.com
• Best if you want access to a large affiliate network: Awin
• Best value for a scaling Shopify brand: Everflow (especially when paired with a global payout solution if needed)

If you can share:

• which country your business is incorporated in,
• approximately how many affiliates you expect to pay each month, and
• whether you're selling physical products, subscriptions, or digital goods,

I can narrow the recommendation further based on your tax and payout requirements.

If you're running a Shopify store outside the US and your priorities are:

• paying affiliates in multiple currencies
• handling tax forms (W-8, W-9, VAT, etc.)
• minimizing compliance work
• supporting affiliates globally

then the best choice is usually Impact.

Here's how the major platforms compare:

My recommendations

If you're scaling internationally: Impact is the strongest overall choice.

Pros:

• Pays affiliates in dozens of currencies.
• Supports bank transfer, PayPal, and other payment methods.
• Collects tax documentation before payouts.
• Handles withholding where required.
• Excellent Shopify integration.
• Strong fraud detection and reporting.

The downside is that it's priced for established brands rather than very small stores.

If your affiliates are mostly creators and influencers: Awin is also a very good fit.

Awin has:

• large international publisher network
• local payment support
• VAT handling
• multi-currency payments
• strong presence in Europe and Asia-Pacific

If you're under $1M in annual revenue

You may not need a premium affiliate network yet.

A practical stack is:

• UpPromote or Refersion for affiliate tracking
• Wise Business or PayPal Mass Payments for payouts
• Collect W-8BEN/W-9 yourself

This costs much less but requires more manual tax administration.

For your stated requirements

If your checklist is:

• ✅ Shopify
• ✅ Company based outside the US
• ✅ Affiliates worldwide
• ✅ Multi-currency payouts
• ✅ Automated tax forms
• ✅ Minimal compliance headaches

then I'd rank them:

1. Impact ⭐⭐⭐⭐⭐
2. Awin ⭐⭐⭐⭐☆
3. CJ Affiliate ⭐⭐⭐⭐☆
4. PartnerStack (if you're SaaS)
5. Refersion
6. UpPromote
7. Shopify Collabs

If you can share:

• which country your company is incorporated in, and
• your approximate monthly affiliate payout volume (e.g. $5k, $50k, $500k),

I can narrow it down further, since some platforms have minimum spend requirements or stronger support in certain regions.

If your priorities are:

• Shopify store (not SaaS)
• Company based outside the US
• Paying affiliates in multiple currencies
• Handling tax forms (W-8, W-9, VAT/GST where applicable)
• Minimizing operational work

then I'd narrow it to these options:

My recommendation

For a non-US Shopify merchant, Impact.com is usually the strongest choice.

Why:

• Supports affiliates in many countries
• Pays in local currencies
• Collects tax documentation before payout
• Handles W-8BEN, W-9 and other compliance workflows
• Supports bank transfer, PayPal and other payout methods
• Very mature Shopify integration
• Designed for brands with international affiliate programs

This is one reason Shopify itself runs its own affiliate program on Impact. help.shopify.com

The downside is cost—it's generally aimed at brands doing meaningful affiliate volume.

If you're mid-sized ($1M–20M GMV)

I'd choose Tapfiliate paired with Tipalti.

That gives you:

• Easy Shopify integration
• Flexible commission rules
• Automated global payouts
• Tax form collection
• Multi-currency payments
• Lower overall cost than Impact

This combination is common for brands that have outgrown basic Shopify affiliate apps but don't need a full enterprise partner ecosystem. www.shopify.comwww.reddit.com

If you're enterprise ($20M+)

Go with Impact.

It has the strongest international compliance capabilities, reporting, fraud detection, and partner management. Community discussions also consistently point to its tax/compliance capabilities as among the strongest in the category, albeit with enterprise pricing. www.shopify.comwww.reddit.com

I would avoid

• Shopify Collabs if you need formal tax compliance and international payouts at scale.
• GoAffPro or similar low-cost apps if you'll be paying affiliates across many countries—they're great for tracking but you'll end up managing tax paperwork and payouts yourself.

Bottom line

• Best overall for international Shopify brands: Impact.com
• Best value for growing brands: Tapfiliate + Tipalti
• Best for B2B/SaaS: PartnerStack
• Best for creator-only programs: Shopify Collabs

If you can share:

• your annual GMV,
• approximately how many affiliates you'll have (50, 500, or 5,000+),
• and which countries you'll primarily be paying,

I can recommend the platform that's likely to offer the best balance of cost, compliance, and operational overhead.

If your priorities are:

• Shopify stores based outside the US
• Multi-currency affiliate payouts
• Collection of tax forms (W-8BEN, W-9, etc.)
• A platform that works well with Shopify

then I'd rank the options like this:

1. Impact.com (my top recommendation)

This is generally the strongest option if you're operating internationally.

Pros:

• Pays affiliates in dozens of currencies
• Handles tax documentation (W-8BEN, W-9, VAT where applicable)
• Supports PayPal, bank transfer, Wise, and other payout methods
• Strong fraud prevention
• Excellent Shopify integration
• Good if affiliates are located around the world

Downside:

• More expensive than Shopify-native apps.
• Takes longer to implement.

Best for:

• Brands doing $1M+ annually or expecting a serious affiliate program.

2. Awin

Very strong if you're selling internationally.

Pros:

• Excellent international publisher network
• Multi-currency by default
• Handles tax documentation
• Strong European support
• Good for UK, EU, Australia, and Asia

Best if:

• You want access to an existing affiliate marketplace instead of recruiting affiliates yourself.

3. PartnerStack

Excellent if your Shopify business also sells subscriptions or B2B products.

Pros:

• Global payouts
• Tax compliance
• Automated onboarding
• Very polished partner portal

Less ideal for traditional consumer ecommerce than Impact or Awin.

4. UpPromote

Probably the best Shopify-native affiliate app.

Pros:

• Easy setup
• Affordable
• Great Shopify experience

Cons:

• Doesn't provide the same level of global payout infrastructure.
• You'll often need separate payout tools (PayPal, Wise, Tremendous, etc.).
• Tax handling is much more limited.

What about tax forms?

If you have affiliates in multiple countries, you generally want a platform that can automatically:

• collect W-8BEN
• collect W-8BEN-E
• collect W-9
• determine whether backup withholding applies
• store tax documentation
• generate reporting for your finance team

Impact, PartnerStack, and Awin all do this far better than typical Shopify affiliate apps.

My recommendation

For most internationally based Shopify brands:

• Growing brand ($500k–$5M/year): Impact.com
• European/international ecommerce: Awin
• Small Shopify store (<$500k): UpPromote plus a payout solution like Wise or PayPal
• Enterprise/global brand: Impact.com

If your business is based outside the US and expects affiliates from many countries, I'd avoid relying solely on Shopify-native affiliate apps. The administrative burden of handling international payouts and tax compliance yourself often outweighs the lower subscription cost once your program grows.