The customer's address is not the ordinary service-source test
For federal income-tax sourcing, compensation for services generally follows where the services are physically performed. A foreign customer, foreign bank, foreign contract currency, or foreign payment destination does not by itself make work performed in the United States foreign-source income. Work performed partly inside and partly outside the United States may require an allocation under the applicable facts and rules. The contract's actual character also matters: royalties, product sales, and services can follow different sourcing provisions.
A U.S. taxpayer generally remains subject to U.S. tax on worldwide income, so identifying foreign-source income does not mean it disappears from the return. Source can instead affect foreign tax credit limitations, treaty analysis, and other international provisions. A customer's home country may apply withholding under its own law using a different framework. That withholding does not automatically establish a U.S. foreign tax credit or change the U.S. source conclusion. Before pricing an overseas engagement, identify who performs the work, where they perform it, and precisely what rights or deliverables the customer purchases.
Model a withheld invoice without assuming a credit
Assume a hypothetical U.S. consulting company invoices a foreign customer $100,000 for an engagement performed entirely by staff working in the United States. The customer withholds $10,000 under a claimed local rule and remits $90,000. The company should not simply report $90,000 of revenue and assume that the withholding solved the remaining tax. Under the assumed service facts, the ordinary U.S. source conclusion is domestic, and the gross contract revenue remains $100,000 before separately analyzing the foreign levy.
If an applicable treaty or local exemption permits relief, the practical response may involve obtaining documentation, challenging the withholding, or seeking a refund. If the tax is genuinely due, foreign tax credit eligibility and limitations require a separate review, including any treaty resourcing provision. At an assumed 25 percent U.S. rate, the gross revenue could produce $25,000 of U.S. tax before expenses and credits. The company cannot safely forecast only $15,000 by subtracting the foreign withholding automatically. A contract gross-up clause or prepayment documentation may materially affect whether the engagement meets its intended margin.
Keep a service-location and withholding file
Retain the statement of work, deliverables, staff assignments, travel dates, work locations, and time records supporting any allocation. Distinguish ordinary business travel from actual performance of the contracted service. If part of a project involves licensing software or other intellectual property, separate the relevant rights and pricing rather than assuming the whole invoice is a service fee. Mixed contracts deserve classification before the first invoice, when the parties can still clarify the commercial terms.
Obtain the foreign withholding certificate, legal basis asserted by the payer, payment date, tax authority, currency, and amount. A customer deduction described only as tax on a remittance advice may be a fee or contract adjustment rather than a creditable income tax. Preserve correspondence about treaty documentation and refund claims. Identify whether the company or another party bears the tax under the contract. Reconcile gross billings, withheld amounts, bank receipts, and currency translation so the books do not hide the levy by reducing sales. That reconciliation gives the preparer the information needed for credit, deduction, refund, or dispute analysis.
Price cross-border work before the cash arrives
The owner should review expected net receipts, withholding procedures, collection timing, and travel costs before signing a foreign engagement. Ask the customer which tax documents are required and when they must be delivered. Administrative failures can create withholding even when relief might otherwise be available. Build enough lead time for the payer's review rather than discovering the requirement after the invoice is approved.
For projects involving work abroad, track actual performance locations throughout the engagement and update the allocation when staffing changes. Permanent establishment, local registration, payroll, value-added tax, and treaty questions may arise separately and should not be treated as resolved by the U.S. service-source rule. Keep those workstreams tied to the same contract facts. The tax forecast should show gross revenue, operating expenses, foreign tax cash, expected relief, and U.S. liability under stated assumptions. That makes an overseas customer a measurable commercial decision instead of relying on the mistaken shortcut that an international payment must be foreign-source and therefore automatically protected from double taxation.
Sources & further reading
Consult the original guidance and its effective dates. These references support the educational discussion; their application depends on the specific facts.