Paying contractors abroad means W-8BEN, 1042-S, withholding, and treaty rates. Here's how US companies get the paperwork, rates, and reporting right.
What you actually owe when you pay someone abroad
Paying a contractor in another country is not the same as paying one in Ohio. The money leaves your bank, but the tax obligation does not leave with it. You may have to withhold part of the payment, report it to the IRS, and send the contractor a form at year end.
Get it wrong and the cost lands on you, not the contractor. The IRS can hold the payer liable for unpaid withholding, plus interest and penalties, even when the contractor already spent the money.
So the first decision is not which form to file. It is whether the person you are paying counts as a contractor or an employee under US rules, because that answer changes everything downstream.
Contractor or employee: the test that decides your forms
The IRS looks at behavioral control, financial control, and the relationship between the parties. If you direct when and how the person works, reimburse their expenses, and they have no other clients, the IRS may treat them as an employee no matter what the contract says.
Misclassifying a foreign worker as a contractor does not save money. It creates back employment taxes, penalties, and in some countries a permanent establishment risk for your company.
When the relationship is genuinely independent, you are paying a nonresident alien for services. That is when the W-8BEN and the 1042-S enter the picture.
The W-8BEN is your proof of foreign status
Before you pay a foreign contractor, collect a Form W-8BEN from the individual, or W-8BEN-E from a company. This form tells you the person is not a US taxpayer and, critically, claims any tax treaty benefit they are entitled to.
The form has no IRS filing requirement. You keep it in your records. But you cannot apply a reduced treaty rate without a valid, signed, current W-8BEN on file.
W-8BEN forms expire. Individuals must refresh theirs every three calendar years, or sooner if their circumstances change. A stale form means you withhold at the default rate, even if a treaty would have cut it.
Withholding: the default rate and the treaty exception
Payments to a foreign contractor for services are generally US-source income only when the work is performed in the United States. If your contractor works from Lisbon or Manila, the income is usually foreign-source and no US withholding applies.
The trap is remote work performed while physically in the US, even for a few weeks. That portion can become US-source and subject to withholding.
When withholding does apply, the default rate for nonresident aliens is 30 percent. A tax treaty between the US and the contractor's country of residence can reduce or eliminate it. The rate depends on the specific treaty article for independent personal services, and not every treaty covers every type of service.
Payments of US-source income to a nonresident alien are subject to withholding at 30 percent unless a treaty provides a lower rate.
Read the treaty, not a summary of it. Two countries with similar treaties can have different service articles.
Form 1042-S reports what you paid
By March 15 of the following year, you file Form 1042-S for each foreign contractor who received US-source income subject to withholding, and you send a copy to the contractor. You also file Form 1042 to report the tax you withheld and deposited.
Even a zero withholding rate needs reporting when the payment is US-source and reportable. Skipping the form because no tax was withheld is a common and expensive mistake.
If the contractor provided a valid W-8BEN and the income is foreign-source, there is generally nothing to report to the IRS. Document why, so the decision survives an audit.
What changes when the contractor is a company, not a person
A foreign corporation billing you for services gets a W-8BEN-E instead of a W-8BEN. The treaty analysis is different, and some treaties deny benefits to shell companies with no substance in the residence country.
If the contractor operates through a foreign entity, confirm the entity is the beneficial owner of the payment. Paying a foreign corporation that is merely a pass-through to a US person can shift the withholding obligation back to you.
This is where a form-by-form matrix by country earns its keep. The right form, the right treaty article, and the right rate are three separate questions.
Build the compliance flow before the first payment
Manual chasing of W-8BENs does not scale past a handful of contractors. Set the sequence once and run every new hire through it.
- Collect the W-8BEN or W-8BEN-E during onboarding, before any payment is scheduled.
- Determine the source of the income based on where the work is performed.
- Check the treaty article and apply the reduced rate only when the form supports it.
- Withhold, deposit, and record the amount against the contractor's profile.
- File 1042-S and 1042 by the deadline, and send the contractor their copy.
- Refresh W-8BEN forms before they expire.
Avos handles steps one and four in the same place it runs the payroll: contractor forms and withholding calculations live alongside the payment run, so the form and the money never drift apart.
Keep the evidence, not just the numbers
An audit does not ask whether you meant well. It asks for the signed form, the treaty basis, the source determination, and the deposit record. Keep all four for each contractor, for as long as the statute of limitations runs.
Store forms encrypted and tied to the person, not to a shared drive. When a contractor leaves, their record should still be retrievable without digging through email.
Compliance for international contractors is not one filing. It is a chain of decisions, and every link has to hold. Build the chain once, then let the payroll system carry it.
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