Form 1042

Who files Form 1042

The instructions put the filing duty on the withholding agent, defined as any US or foreign person that “has control, receipt, custody, disposal, or payment of any item of income of a foreign person that is subject to withholding.” For a platform paying foreign contractors, that is the platform, whoever collected the W-8BEN.

The first trigger on the instructions’ list is the one that matters here: you must file Form 1042 if you are required to file Forms 1042-S under chapter 3 or 4, “whether or not any tax was withheld or was required to be withheld.” Pay for services is US-source only when the work is performed in the United States, so a platform whose foreign contractors all work from abroad usually has no Form 1042-S and no Form 1042. The first onsite week changes that.

The instructions also make the withholding agent personally liable for any tax it was required to withhold, plus interest and penalties. If you should have withheld and did not, and the contractor does not pay the tax either, you and the contractor are both liable, although the tax is collected only once.

Deposits during the year

Form 1042 is filed once a year, but the tax it reports is deposited as you go. The Instructions for Form 1042 set the frequency by how much withheld tax is sitting undeposited. If at the end of any quarter-monthly period (the 7th, 15th, 22nd and last day of the month) undeposited tax is 2,000 USD or more, deposit it within 3 business days. If at the end of a month it is at least 200 USD but less than 2,000 USD, deposit it within 15 days after the end of the month. If at the end of the year it is less than 200 USD, pay it with Form 1042 or deposit it by March 15.

Deposits must be made electronically through EFTPS or IRS Direct Pay, in US dollars, and the instructions warn that failing to deposit electronically can bring a 10% penalty. Publication 515 adds that a deposit for one calendar year must be made separately from a deposit for another year and from any other type of tax.

The return separates liability from deposits. Lines 1 through 60, the Record of Federal Tax Liability, show the tax liability for the quarter-monthly period in which each payment was made, not the date you deposited it.

How Form 1042 reconciles to your Forms 1042-S

Section 2 of Form 1042 is a reconciliation, and the instructions say it must be completed even if you withheld nothing under chapter 4. Line 62a should equal the sum of the gross income amounts in box 2 of your Forms 1042-S that are payments of US-source FDAP income. Line 63a should be the tax you actually withheld, before adjustments for later repayments or catch-up withholding.

The instructions also require one Form 1042 consolidating all Form 1042-S recipient information, “regardless of the number of different clients, branches, divisions, or types of income.” You round to whole dollars on the return, adding the cents first and rounding only the total.

A worked example. In 2026 a platform pays two foreign contractors for onsite work in New York. Contractor A has only a W-8BEN, so on a 3,000 USD payment on May 20 the platform withholds 30%, 900 USD, and transfers 2,100 USD. Contractor B is paid 3,000 USD for onsite work covered by an accepted Form 8233, so nothing is withheld.

The platform files two Forms 1042-S, each showing 3,000 USD of gross income in box 2, one with 900 USD withheld and one with the treaty exemption. The 900 USD never reaches 2,000 USD at a quarter-monthly check, but it is at least 200 USD at the end of May, so it is deposited within 15 days after May ends. On Form 1042, the 900 USD liability goes on the line for the May period ending on the 22nd, and Section 2 shows 6,000 USD of gross income, matching the two box 2 amounts, and 900 USD withheld.

If both contractors had accepted Forms 8233, the platform would deposit nothing and still file both Forms 1042-S and a Form 1042 showing 6,000 USD of income and zero tax.

Filing, e-filing and penalties

Mail or e-file Form 1042 by the 15th day of the third month after the calendar year ends, March 15, moving to the next business day when the date falls on a weekend or holiday. For 2026 payments that is Monday, March 15, 2027, the same day the Forms 1042-S are due to the IRS and to each recipient. Form 7004 gives more time to file but, the instructions note, “does not extend the time for payment of tax.”

Publication 515 lists three cases in which e-filing is required: a withholding agent that is a financial institution, one that must file 10 or more information returns in a calendar year as described in Regulations section 301.6011-2, and a partnership with more than 100 partners. That count is of information returns as the regulation describes them, not only Forms 1042-S, so check it against everything you file for the year.

Penalties are figured on unpaid tax. Filing late costs 5% of the unpaid tax for each month or part of a month, up to 25%, and paying late usually costs one-half of 1% a month, also capped at 25%. The instructions also allow penalties for negligence, substantial understatement and fraud.

Form 1042 versus Form 945

A Stripe Connect platform that pays both US and foreign contractors can end up with two annual withholding returns, and they do not overlap.

Form 945, Annual Return of Withheld Federal Income Tax, reports federal income tax withheld from nonpayroll payments, including backup withholding: the 24% a payer withholds from a US payee who has not provided a correct taxpayer identification number on a Form W-9. Its instructions say not to report on Form 945 “withholding that is required to be reported on Form 1042.” Form 945 for 2025 was due February 2, 2026, and you do not file one for a year in which you have no nonpayroll tax liability.

Form 1042 covers the foreign side: tax withheld on US-source income paid to foreign persons, documented on Forms W-8 or 8233. It is due March 15, and the duty to file follows the Forms 1042-S, not the withholding, so a zero year still needs a return.