For businesses and financial institutions managing payments to foreign persons, understanding IRS Forms 1042-S and 1042 is crucial for compliance. These forms are used to report certain income and withholding on U.S.-sourced income earned by non-U.S. individuals and entities.
Form 1042-S, Foreign Person's U.S. Source Income Subject to Withholding, is an information return used to report income payments made to foreign persons, as tax withholdings on that income (if any).
A withholding agent must file a Form 1042-S to report amounts paid during the preceding calendar year that are subject to reporting, as well as the corresponding amounts withheld. They key attributes that must be reported on form 1042-S include:
Withholding agents must complete a separate form 1042-S for each recipient of income, each income type paid to the same recipient, and each amount to which a separate tax rate was applied. The specific requirements of this form makes it one of the more difficult annual information returns to complete.
The form 1042-S requires that the Chapter 3 and Chapter 4 status be provided for the income recipient:
The necessity of providing both a Chapter 3 status code and a Chapter 4 status code for the recipient, along with corresponding tax rate information and exemption codes, underscores the complexity of Form 1042-S. Even when a payment is clearly subject only to Chapter 3 rules (e.g., if it is not a withholdable payment), the Chapter 4 exemption code and Chapter 4 rate must still be filled out to explicitly document that Chapter 4 withholding does not apply. This double-status documentation ensures the IRS has a clear audit trail regarding compliance with both primary international withholding regimes.
Beginning with the 2026 Form 1042-S, withholding agents must report the applicable Chapter 3 exemption code in Box 3a whenever a reduced withholding rate applies. This replaces the previous practice of reporting "00" whenever tax was withheld, even at a lower treaty or Internal Revenue Code rate. To support this change, the descriptions for two primary exemption codes have been expanded:
The updated instructions clarify that Box 3a is now used when withholding is applied at a reduced rate or when the payment is fully exempt, while Box 4a is used specifically when the tax rate reported in Box 4b is 0.00%.
Form 1042, Annual Withholding Tax Return for U.S. Source Income of Foreign Persons, is the accompanying annual tax return that must be filed by every withholding agent that filed Form 1042-S for the year. This form summarizes the income paid and tax withheld under Chapter 3 or Chapter 4 as reported on the forms 1042-S filed for the year.
FDAP income is the primary class of income subject to reporting and withholding for foreign persons. FDAP income includes anything that would be included in gross income for the recipient, such as interest, dividends, rents, royalties, and compensation.
Generally, an amount subject to Chapter 3 withholding is FDAP income from sources within the United States, most commonly referred to as US-sourced income. Income is typically considered US-Sourced if the property or services producing the income are located or performed in the United States.
FDAP income includes specific types of payments such as:
Amounts that are not generally considered FDAP income include:
Withholding agents must adhere to a strict deadline for filing Forms 1042 and 1042-S with the IRS, as well as furnishing copies of Form 1042-S to recipients:
Electronic Filing Requirement: If a withholding agent is a financial institution (whether U.S. or foreign) or is required to file at least 10 information returns during the year, they must file Form 1042-S electronically using the FIRE System. For Form 1042, electronic filing is required for financial institutions, partnerships with over 100 partners, or agents who must file 10 or more information returns in a calendar year.
Not sure where you stand? Work through our Readiness Checklist for Filing Forms 1042/1042-S to see what’s ready, what needs attention, and where to focus before year end.
If you have any questions about filing your 1042 and 1042-S forms, reach out to our expert team today. At Taxbit, we can help you with streamlining intake, validation, reporting, and IRS e-filing.