Paying International Contractors: W-8BEN, Withholding, and 1042-S

When you hire a contractor based outside the United States, the rules for paying international contractors do not run through Form 1099-NEC. That form is for US persons. Payments to a nonresident alien or a foreign entity get reported on Form 1042-S instead, and if any of the work is performed on US soil, you generally have to withhold 30% of that portion and send it to the Treasury unless a tax treaty lowers the rate.¹ Whether you owe anything at all comes down to two questions: is the contractor a US person or a foreign person, and where do they physically sit while doing the work.

US Person or Foreign Person

The distinction that decides which form you use is tax status, not geography. A US citizen working from Berlin is still a US person. A Canadian citizen working from Toronto is a foreign person. A Canadian citizen who has spent enough time in the US to meet the substantial presence test may qualify as a resident alien, which makes them a US person again.

If your contractor turns out to be a US person living abroad, the domestic rules apply straight through. You collect a Form W-9, and if you pay them $600 or more during the year for services, you issue a Form 1099-NEC.² No 30% withholding, no Form 1042-S, no sourcing analysis. The W-8 and W-9 forms are designed to sort this out; ask the contractor to complete whichever one matches their status, and let their answer decide the path.

Everything else in this article assumes you have confirmed the contractor is a foreign person.

Where the Work Is Performed Drives Everything

For personal services, the IRS sources income based on the physical location where the work happens, not where the contractor lives or where you send payment.³ That single rule splits foreign contractors into two very different compliance pictures.

All Work Done Outside the US

When a foreign contractor does all their work from another country, the income is foreign-sourced. Foreign-sourced income paid to a foreign person is generally not subject to US withholding or information reporting. You pay the contractor the full amount, withhold nothing, and file no Form 1042-S. You should still collect a Form W-8BEN to document the contractor’s foreign status, but the payment itself creates no US tax event.

This is where most US businesses with overseas remote contractors land. The compliance burden is minimal, provided the contractor never sets foot in the US to do any of the contracted work.

Any Work Done Inside the US

If the contractor performs any part of the services while physically in the US, that portion becomes US-sourced income, and US-sourced income paid to a foreign person triggers withholding and reporting you cannot skip. You need to figure out what percentage of the total contract value corresponds to work done on US soil and apply the rules to that amount.

Say you pay a foreign contractor $10,000 and they spend one week working at your US office out of a ten-week project. Roughly $1,000 is US-sourced, subject to withholding and reportable on Form 1042-S. The remaining $9,000 stays foreign-sourced and typically carries no US tax obligation. Getting an accurate breakdown of where work was performed is your responsibility as the payer, so build that tracking into the contract from day one.

The Paperwork You Actually Need

Foreign contractors do not fill out a W-9. That form is reserved for US persons, including US citizens, resident aliens, and domestic entities.² Foreign contractors provide a form from the W-8 series, and which one depends on whether you are paying an individual or an entity.

Form W-8BEN for Individuals

A nonresident alien individual gives you Form W-8BEN to certify foreign status.⁴ The form collects name, permanent address, country of citizenship, and either a foreign tax identification number or a US Individual Taxpayer Identification Number. A contractor claiming treaty benefits on non-services income (royalties, dividends) uses the treaty-claim section of Form W-8BEN and must provide either a foreign TIN or an ITIN. Without one of those numbers, the treaty claim is invalid and you withhold at the full 30%.⁵

A completed W-8BEN stays valid from the date of signing through the last day of the third calendar year that follows. A form signed in June 2026 remains good through December 31, 2029. If anything on the form changes before that, the contractor must send an updated version.⁵

Form W-8BEN-E for Entities

When the contractor is a foreign corporation, partnership, or other entity, the equivalent form is W-8BEN-E.⁴ It is longer and more complex because the entity must also declare its status under the Foreign Account Tax Compliance Act. Most independent contracting firms are not financial institutions and will classify as an active or passive non-financial foreign entity, which is the simpler path through the form.

Form 8233 for Treaty Claims on Services Income

This one trips up plenty of payers. When a nonresident alien contractor wants to claim a tax treaty exemption specifically on compensation for personal services performed in the US, the correct form is Form 8233, not the W-8BEN.⁶ IRS Publication 515 is explicit: “Independent nonresident alien contractors use Form 8233 to claim an exemption from withholding under a tax treaty.”⁷

The W-8BEN establishes foreign status and handles treaty claims on passive income. Services income runs on a separate channel. If your contractor lives in a treaty country and qualifies for an exemption on independent personal services, they submit Form 8233 directly to you, and you forward a copy to the IRS. Until you hold a valid Form 8233, you withhold at 30% regardless of any treaty the contractor believes applies.

No Valid Form, No Exceptions

If you do not have a valid W-8 form (or Form 8233, where applicable) at the time you make the payment, you must treat the contractor as undocumented and withhold at 30% on all US-sourced payments.⁸ There is no grace period, and you cannot fix it retroactively by collecting the form later. The withholding obligation attaches when the payment leaves your hand.

The 30% Withholding

Federal law requires anyone paying US-sourced income to a nonresident alien to withhold a tax equal to 30% of the gross payment.⁹ You deduct this from the contractor’s payment and send it to the Treasury. If the contractor is owed $5,000 for US-sourced work, you pay them $3,500 and deposit $1,500 with the IRS.

Treaty Reductions

Many US tax treaties reduce or eliminate the 30% withholding on independent personal services income. Terms vary by country. Some treaties exempt services income entirely as long as the contractor has no permanent establishment in the US and their stay is under 183 days. Others reduce the rate without eliminating it.⁷ The contractor claims the reduction on Form 8233. Do not apply a reduced rate before a valid, completed form is in your file.

Depositing the Tax

Withheld tax must be deposited electronically through EFTPS or IRS Direct Pay. Failing to deposit electronically can trigger a 10% penalty on its own.¹⁰ How fast you have to deposit depends on how much has piled up. If you accumulate $2,000 or more, the deposit is due within 3 business days after the end of the quarter-monthly period in which you hit that threshold (quarter-monthly periods end on the 7th, 15th, 22nd, and last day of each month). If you have between $200 and $1,999 at month-end, you have 15 days after month-end. If the total is under $200 at year-end, you can pay it with Form 1042 by March 15 of the following year.¹¹ Most businesses paying one or two foreign contractors sit in the lower tiers, but frequent or large payments can push you into the 3-business-day rule quickly.

Year-End Reporting: Forms 1042-S and 1042

Compensation paid to nonresident aliens is reported on Form 1042-S, not on Form 1099-NEC.¹ You prepare a separate Form 1042-S for each foreign contractor who received US-sourced income during the year, reporting the gross amount paid, the tax withheld, and the basis for any treaty-based exemption. Give a copy to the contractor and file one with the IRS by March 15 of the following year. A Form 1042-S is required even when no tax was withheld because a treaty eliminated the obligation.¹²

Form 1042 is the annual summary that reconciles everything. It reports the total US-sourced income you paid to all foreign persons, the total tax you were required to withhold, and the total you actually deposited. The totals on Form 1042 must match the combined totals from all your Forms 1042-S. Form 1042 is also due March 15.¹

If you file 10 or more information returns of any type during the calendar year, you must e-file your Forms 1042-S.¹³ The threshold used to be 250 and dropped to 10 starting in 2024, so far more small businesses are caught now than under the old rule. Starting with 2026 Forms 1042-S (due March 15, 2027), the IRS requires electronic filing through the Information Returns Intake System (IRIS).¹²

What It Costs to Get This Wrong

The penalty structure hits from several sides at once.

Late filing of Form 1042-S is tiered by how late you are. Within 30 days of the deadline, it is $60 per form, up to $698,500 per year ($244,500 for small businesses). More than 30 days late but by August 1, it rises to $130 per form, up to $2,095,500 per year ($698,500 for small businesses). After August 1 or not filed at all, $340 per form, up to $4,191,500 per year ($1,397,000 for small businesses). Intentional disregard costs $690 per form or 10% of the total reportable amount, whichever is greater, with no annual cap.¹² A separate penalty applies for failing to furnish the correct Form 1042-S to the contractor by March 15; that penalty runs $310 per failure for the 2024 filing year, with higher amounts for intentional disregard.¹⁴

The bigger exposure is failure to withhold. As a withholding agent, you are personally liable for tax you were required to withhold but didn’t. Pay a foreign contractor $10,000 for US-sourced work and neglect to withhold the $3,000 you owed, and the IRS can collect that $3,000 from you. The contractor already has the money and may be unreachable in another country. You cannot deduct it from a future payment if the relationship has ended.

On top of that, individual officers or responsible persons within a business who willfully fail to collect and remit withheld taxes face a trust fund recovery penalty equal to the full amount of the unremitted tax.¹⁵ This penalty runs against the person, not just the business. Late deposits also trigger separate penalties under IRC 6656 that grow the longer the deposit is overdue.

1
Internal Revenue Service. Reporting Payments to Independent Contractors
2
Internal Revenue Service. Instructions for the Requester of Form W-9 (Rev. March 2024)
3
Internal Revenue Service. Source of Income – Personal Service Income
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 (Rev. October 2021)
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Internal Revenue Service. About Form 8233, Exemption From Withholding on Compensation for Independent (and Certain Dependent) Personal Services of a Nonresident Alien Individual
7
Internal Revenue Service. Publication 515 (2026), Withholding of Tax on Nonresident Aliens and Foreign Entities
8
Internal Revenue Service. NRA Withholding
9
Office of the Law Revision Counsel. 26 USC 1441 – Withholding of Tax on Nonresident Aliens
10
Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System
11
Internal Revenue Service. Instructions for Form 1042 (2025)
12
Internal Revenue Service. Instructions for Form 1042-S
13
Internal Revenue Service. Topic No. 801, Who Must File Information Returns Electronically
14
Internal Revenue Service. Penalties Related to Form 1042-S
15
Office of the Law Revision Counsel. 26 USC 6672 – Failure to Collect and Pay Over Tax, or Attempt