How to Pay Foreign Contractors: Withholding, Forms, and 1042-S

Paying a foreign contractor comes down to four things done in order: confirm where the work is physically performed, collect the right IRS form before you send money, verify the person is genuinely a contractor rather than an employee in disguise, and then choose a transfer method that matches your volume. If the contractor does all the work outside the United States, the payment is foreign-source income and you generally owe no U.S. withholding. If any of the work happens on U.S. soil, a portion of the payment becomes U.S.-source and pulls you into withholding and year-end reporting.

Where the Work Is Performed Decides Withholding

Federal tax law ties withholding to the source of the income, not the contractor’s nationality or the location of your business. Compensation for personal services performed outside the United States is foreign-source income under the tax code.¹ The place where the contractor physically does the work controls the classification, regardless of where you signed the contract or where the payment is sent.²

A developer in Berlin building your app from Germany is earning foreign-source income. A consultant running campaigns from Tokyo is earning foreign-source income. The 30% withholding under Section 1441 applies only to U.S.-source payments, which for services means work performed inside the United States.³

When a contractor splits time between countries, the IRS requires you to allocate the income on a time basis. Multiply the total compensation by the fraction of days worked in the United States over the total days of service.² Only the U.S.-source slice triggers withholding. A contractor who flies in for a two-week planning session and works remotely from abroad the rest of the year generates U.S.-source income only for those two weeks.

Collect the Right IRS Form Before You Pay

Before you send any money, get a withholding certificate on file. This is your protection against absorbing a tax bill later. Individual foreign contractors give you a Form W-8BEN. Contractors operating as business entities, such as corporations or partnerships, give you Form W-8BEN-E.⁴ The contractor completes it, but you’re the one who pays if it’s missing.

The form captures the contractor’s legal name, permanent address, and a taxpayer identification number. Foreign contractors generally provide the tax ID issued by their home country. If a contractor is claiming treaty benefits and has no foreign tax ID, they typically need a U.S. Individual Taxpayer Identification Number (ITIN) instead.⁵ An ITIN is also required for a contractor participating in a U.S. partnership that conducts business domestically, regardless of any treaty claim.

Treaty Claims and Reduced Rates

A substantial part of the W-8BEN is dedicated to claiming benefits under an income tax treaty between the United States and the contractor’s country of residence. The default withholding rate on U.S.-source income paid to a foreign person is 30%.³ A valid treaty claim can reduce that rate or eliminate withholding entirely. Many treaties provide full exemptions for independent personal services when the contractor has no permanent establishment in the U.S. The specific rate depends on the treaty and the type of income.

Without a valid W-8BEN on file, you have no basis to withhold anything less than 30%. And the withholding agent is personally liable under federal law for any tax that should have been withheld but wasn’t.⁶ Collect the form before the first payment.

How Long the Form Lasts

A W-8BEN is valid from the date it’s signed through the last day of the third following calendar year, unless something changes that makes the information incorrect. A form signed in March 2026 expires on December 31, 2029.⁵ If the contractor moves countries or changes a treaty claim, you need a new form right away. Set a renewal reminder.

Electronic signatures are accepted, but with conditions. A typed name in the signature line is not enough. The electronic signature must include a time and date stamp and a statement confirming the form was electronically signed by an authorized person.⁵ Many digital contract platforms meet these standards; verify yours does before relying on it.

Confirm the Person Is Actually a Contractor

Calling someone a contractor doesn’t make them one. The IRS applies the same classification test to foreign workers that it uses at home, weighing three categories of evidence: behavioral control, financial control, and the type of relationship.⁷

Behavioral control asks whether you direct not just what the contractor delivers but how they do it. Dictating their hours, requiring your tools and software, or supervising their methods pushes toward employment. Financial control looks at who bears business expenses, whether the contractor can work for others, and how payment is structured. Invoicing for project milestones reads differently from a biweekly paycheck. The relationship factor considers written agreements, whether you provide benefits, and whether the work is core to your business or a discrete project.⁷

No single factor is decisive. The IRS weighs the full picture. Companies expanding internationally routinely trip on this by hiring a “contractor” abroad, issuing a company email, setting fixed schedules, and folding the person into daily operations. That pattern invites reclassification, which brings back taxes and penalties in the U.S. and can trigger liability under the foreign country’s employment laws as well.

Banking Details You Need Before Sending Funds

Gather the contractor’s payment details precisely. International transfer errors are slower and more expensive to fix than domestic ones. You need the contractor’s full legal name exactly as their bank has it, the bank’s official name, and the physical address of the branch holding the account.

Most international transfers require a SWIFT code, also called a Business Identifier Code, an eight- or eleven-character string identifying the bank and its country.⁸ For contractors in Europe and many other regions, you’ll also need the International Bank Account Number (IBAN) identifying the specific account. Confirm whether the contractor wants payment in U.S. dollars or their local currency. That choice affects the exchange rate and the final amount landing in the account after conversion fees. Get everything in writing before the first transfer.

Ways to Send the Payment

The right method depends on volume, frequency, and how much compliance work you want to handle in-house.

Bank wire transfers. Your commercial bank’s portal accepts the SWIFT code, IBAN, and recipient details directly. Wires are reliable and widely accepted, though per-transaction fees add up with frequent payments. Processing usually takes one to five business days depending on the corridor.
Digital payment platforms. Services like Wise, Payoneer, and PayPal let you link a business account and invite contractors to set up profiles. They often offer better exchange rates and lower fees than traditional wires, and they simplify recordkeeping by tying payments to the profiles you’ve already set up.
Global payroll services. For businesses paying multiple foreign contractors across countries, these platforms automate currency conversion, local compliance checks, and scheduling. They cost more but reduce error risk at scale.

Whichever route you take, save the confirmation. Wire transfers generate a federal reference number; digital platforms produce a transaction ID. These are your proof of payment for audits and disputes.

Year-End Reporting If Any Payment Was U.S.-Source

If everything the contractor did was performed abroad, you generally have no 1042-S filing obligation for those payments. If any part of the compensation was U.S.-source, reporting is mandatory.

Form 1042-S

File Form 1042-S for each foreign contractor to whom you paid U.S.-source income during the calendar year. The form reports the gross income, the withholding rate applied, and the tax withheld. Copies go to both the IRS and the contractor by March 15 of the following year. Late-filing penalties scale with how late you are and cap at higher totals for larger businesses, with a separate penalty of up to $340 per form for failing to furnish a copy to the contractor.⁹

Form 1042

Along with the individual 1042-S forms, file Form 1042, the annual return that aggregates all payments to foreign persons and reconciles total taxes withheld for the year.¹⁰ The IRS uses it to cross-check individual 1042-S filings against the withholding you actually deposited. Keep transaction logs through the year so the totals match your bank records without a scramble in March.

The E-File Threshold

If your business files 10 or more information returns of any type during the year, you must file Form 1042-S electronically.¹¹ That count combines all your information returns, not just 1042-S forms, so even a few foreign contractor payments can put you over the line when combined with domestic 1099s.

The compliance load here is real but predictable. Good documentation before the first payment, organized records through the year, and the March filings become routine.

1
Office of the Law Revision Counsel. 26 U.S. Code 862 – Income From Sources Without the United States
2
Internal Revenue Service. Source of Income – Personal Service Income
3
Office of the Law Revision Counsel. 26 USC 1441 – Withholding of Tax on Nonresident Aliens
4
Internal Revenue Service. About Form W-8 BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting (Individuals)
5
Internal Revenue Service. Instructions for Form W-8BEN
6
Office of the Law Revision Counsel. 26 U.S. Code 1461 – Liability for Withheld Tax
7
Internal Revenue Service. Independent Contractor (Self-Employed) or Employee?
8
Swift. Business Identifier Code (BIC)
9
Internal Revenue Service. Instructions for Form 1042-S (2026) – Section: Penalties
10
Internal Revenue Service. About Form 1042-S, Foreign Person’s U.S. Source Income Subject to Withholding
11
Internal Revenue Service. Instructions for Form 1042-S (2026) – Section: General Instructions