Foreign Source Income

Foreign source income is income the US source rules assign to a place outside the United States. The concept matters most for payments to foreign persons, because a nonresident alien is generally taxed by the US only on US-source income. When a contractor abroad does all the work abroad, the fee is foreign source, which means it sits outside NRA withholding and is not reported on Form 1042-S. The IRS confirms this on its page on foreign source income, Form 1042-S reporting not required. For US companies paying remote contractors, this is the rule that keeps most cross-border payments simple.

What Makes Income Foreign Source

Source is determined by income type under the source of income rules in Internal Revenue Code section 861 and the surrounding provisions. For personal services, the IRS rule is that “the source of income from labor or personal services is determined by where the services are performed, not where the contract is made, the place of payment, or the residence of the payer.” So a contractor working from Lisbon earns foreign source income even though a US company pays them from a US bank under a US-law contract.

This is the opposite face of US-source FDAP income. The same fee is FDAP either way, but it only enters the US withholding regime if it is US-source. Performed abroad, it is foreign source and outside the regime.

Why It Is Outside US Withholding

The IRS position is that “foreign source income (including U.S. source income that is not FDAP) is generally not subject to NRA withholding under IRC section 1441(a)” and that a withholding agent is generally not required to withhold on payments of income from foreign sources. The logic is direct:

1. A nonresident alien is taxed by the US only on US-source income.
2. Foreign source income is, by definition, not US-source.
3. So it is generally not US-taxable, NRA withholding does not reach it, and there is no 1042-S obligation.

The practical result for a US payer is that paying a contractor who works entirely in their home country usually involves no US withholding and no Form 1042-S at all. The payer is still a withholding agent in role, but there is nothing to withhold on a foreign-source payment.

Documentation Still Matters

No withholding does not mean no paperwork. To support the foreign-source, no-withholding position, the payer should hold:

• A valid Form W-8BEN from a foreign individual, or Form W-8BEN-E from a foreign entity, establishing the payee is a foreign person.
• Records showing where the services were performed, so the foreign source of the income is defensible.

The IRS notes that a withholding agent should obtain proper documentation, such as Form W-8BEN, to establish that the payee is foreign and the income is foreign source. Without that file, an agent cannot defend the position if the IRS asks why no withholding occurred and no 1042-S was filed.

Split Engagements

The clean case is all-abroad work. The complication is mixed work. If a foreign contractor performs part of the engagement in the US and part abroad, only the US-performed portion is US-source. That portion may need withholding and a 1042-S, while the foreign-performed portion stays foreign source. A US payer should track work location, not just total fee, to split the two correctly. The narrow commercial-traveler exception under section 861(a)(3) can keep very short, low-dollar US presence out of US-source treatment, but its thresholds are small.

Common Pitfalls

• Assuming a US payer means US-source. Where the payer sits is irrelevant for personal services. Work location controls.
• Withholding on foreign-source income. Applying 30 percent to a contractor who works entirely abroad over-withholds on income the US does not tax.
• Filing 1042-S on foreign-source payments. These are not reportable on 1042-S. Filing them anyway creates noise and implies US-source treatment.
• No W-8 on file. The foreign-source position needs documentation of foreign status to hold up.

Related Forms and Terms

• Source of Income Rules: the rules that make income foreign source.
• NRA Withholding: the regime foreign source income falls outside of.
• FDAP Income: the same income, taxable only when US-source.
• Form 1042-S: not required for foreign source payments.
• Form W-8BEN: the documentation that supports the foreign source position.

Omnivoo Contract Management records where each contractor performs the work and holds the matching W-8, so foreign source payments stay correctly outside US withholding and 1042-S reporting with the documentation to prove it.