Form 1042-S Reporting: Withholding Agents, Form 1042 and IRIS

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Form 1042-S reporting is the per-recipient half of the Internal Revenue Service’s annual withholding cycle for U.S. source income paid to foreign persons. A withholding agent issues one Form 1042-S, Foreign Person’s U.S. Source Income Subject to Withholding, for each recipient, each type of income and each tax rate applied, files it with the IRS and furnishes it to the recipient by 15 March of the year after the payment. Form 1042, the Annual Withholding Tax Return for U.S. Source Income of Foreign Persons, is due the same day and ties the agent’s period-by-period liability to every Form 1042-S and to the year’s deposits.

The two forms are checked against each other. The Form 1042 instructions tell agents to reconcile them to avoid unnecessary IRS correspondence, and the Form 1042-S instructions warn that the IRS may disallow a recipient’s refund or credit claim if the attached copy differs from the copy filed. The filing route is moving as well: the IRS generally requires electronically filed 2026 Forms 1042-S, due 15 March 2027, to be submitted through the Information Returns Intake System (IRIS), but provides an IDES alternative for eligible foreign filers whose authorised users have neither a U.S. Social Security number (SSN) nor an individual taxpayer identification number (ITIN), and the IRS set 19 November 2026 as the last day to file information returns through FIRE.

Edition-specific figures below come from the 2026 Instructions for Form 1042-S, the 2025 Instructions for Form 1042 and Publication 515 (2026). Later editions appear at IRS.gov/Form1042 and IRS.gov/Form1042S.

Related reading: Form 8966 Reporting: FATCA Filers, IDES and the 31 March Deadline

The operative dates in the annual cycle:

  • During the year: deposits of withheld tax through EFTPS or IRS Direct Pay, on a rhythm set by the undeposited balance.
  • 15 March of the following year: Form 1042 filed, Forms 1042-S filed with the IRS and furnished to recipients. A Saturday, Sunday or legal holiday moves the date to the next business day.
  • Extensions: six months for Form 1042 (Form 7004, filing only), 30 days for the IRS copies of Form 1042-S (Form 8809) and a one-time extension of up to 30 days, subject to IRS approval, for recipient copies (Form 15397).
  • 1 August: the step at which the penalty for a late but correct Form 1042-S reaches its top per-form rate.
  • 15 September of the following year: the extended Form 1042-S date for a partnership that withholds on a foreign partner’s prior-year share after 15 March, under proposed regulations filers may rely on.

Two withholding regimes of the Internal Revenue Code sit underneath. Chapter 3, whose core withholding rules are sections 1441 and 1442, covers withholding on nonresident aliens and foreign corporations; for Form 1042-S purposes the instructions define it to exclude sections 1445 and 1446. Chapter 4 (sections 1471 to 1474) is the regime known as FATCA. The Privacy Act notice in the Form 1042 instructions names sections 1441, 1442, 1446 (for publicly traded partnerships) and 1471 to 1474 as the provisions that require withholding agents to report and pay over the tax. The IRS issues both forms.

The filing rules are in the Treasury Regulations. Regulations section 1.1461-1(b) requires the annual return on Form 1042 on or before 15 March, and section 1.1461-1(c) requires one copy of each Form 1042-S to be filed with the IRS by the same date, with paragraph (c)(2) defining the amounts subject to reporting. The chapter 4 counterparts are Regulations section 1.1474-1(c) for Form 1042 and section 1.1474-1(d) for Form 1042-S, where paragraph (d)(2)(i) defines a “chapter 4 reportable amount”. Regulations section 301.6011-15 generally requires electronic filing of Form 1042 by a withholding agent, other than an individual, estate or trust, that must file at least 10 returns of any type during the calendar year in which Form 1042 is required to be filed. It separately requires electronic filing by withholding-agent partnerships with more than 100 partners, directs financial institutions to section 301.1474-1, provides for hardship waivers and applies to taxable years ending on or after 31 December 2023.

Form 1042 also carries the 2% section 5000C tax on specified federal procurement payments, section 877A withholding on payments to covered expatriates, and certain section 1445 and 1446 withholding by qualified investment entities, publicly traded partnerships and their nominees. Liability is personal: the withholding agent is liable for any tax required to be withheld, plus interest and penalties. Under chapter 3, where the agent fails to withhold and the foreign payee does not pay its own U.S. tax, both are liable and the tax is collected once; if the payee pays, the agent still owes interest and penalties.

Some mechanics rest on proposed rather than final regulations. Proposed regulations issued on 18 December 2018 (REG-132881-17, 83 FR 64757) may generally be relied on under section 7805(b)(1)(C) until final regulations are issued, and the instructions use them for subsequent-year withholding by partnerships and trusts and for a longer overwithholding adjustment window. Both are reliance options; neither set of instructions makes them mandatory.

Who must report on Forms 1042 and 1042-S: withholding agents, capacities and the one-return rule

The filer is the withholding agent, defined in the Form 1042-S instructions as any person, U.S. or foreign, that has control, receipt or custody of an amount subject to chapter 3 withholding and can disburse or pay it, or that makes a withholdable payment under chapter 4. The term expressly covers qualified intermediaries (QIs), nonqualified intermediaries (NQIs), withholding foreign partnerships and trusts (WPs and WTs), flow-through entities and U.S. branches treated as U.S. persons. For chapter 4, the Form 1042 instructions add participating FFIs and registered deemed-compliant FFIs to the extent they must withhold. A person can be a withholding agent with nothing to withhold.

Is the payment an amount subject to reporting?

Reportable amounts are U.S. source amounts paid to foreign persons, including persons presumed foreign, that are reportable under chapter 3 or chapter 4, even where nothing is withheld because of a treaty or Code exception, or because withheld tax was repaid. The core is fixed, determinable, annual or periodical (FDAP) income, plus certain timber, coal and iron ore gains and contingent payments for patents and similar property, and any payment on which chapter 4 withholding is applied or required. Deposit interest has its own rule: the 2026 instructions require reporting of section 871(i)(2)(A) interest of $10 or more on a deposit at a U.S. office paid to a nonresident alien individual resident in a country identified in Rev. Proc. 2024-42 (or any superseding revenue procedure that is in effect for the 2026 reporting year), and permit a payer to report all such interest.

Zero withholding does not take a payment out of scope. The instructions require a Form 1042-S where no chapter 3 tax was withheld because a treaty or the Code exempted the income, including income effectively connected with a U.S. trade or business. Outside the regime are, among others, interest and original issue discount on obligations payable 183 days or less from issue (subject to the deposit interest rule) and withholdable payments not otherwise reportable for chapter 3 where chapter 4 withholding was not applied. An individual paying outside a trade or business with no withholding required, such as portfolio interest on a personal loan, files nothing.

Does a Form 1042-S obligation pull in Form 1042?

Always. Every agent required to file Form 1042-S must also file Form 1042, whether or not tax was withheld, and even when the Forms 1042-S are e-filed. Form 1042 is also required for an agent that files Forms 1042-S to report to a recipient the tax withheld by its own withholding agent, that pays gross investment income to foreign private foundations taxed under section 4948(a), or that is a QI, WP, WT, participating FFI or reporting Model 1 FFI claiming a collective refund under its IRS agreement.

In which capacity, and under which EIN?

The instructions require a single Form 1042 that consolidates all Form 1042-S recipient information for both chapters, regardless of the number of clients, branches, divisions or types of income. Capacity breaks that rule: an entity acting as a QI for designated accounts and as an NQI for others files one Form 1042 per capacity, and a U.S. branch of a participating FFI reporting under chapter 4 files its own. A financial institution holding a global intermediary identification number (GIIN) still needs an employer identification number (EIN), and one filing for a branch other than its U.S. branch cannot use the U.S. branch’s EIN.

Branch status splits withholding from reporting. A U.S. branch that agrees to be treated as a U.S. person gets that treatment only for deciding whether it must withhold; for information reporting it stays a foreign person, and payments to it go on Form 1042-S. Foreign withholding agents file on the same terms, and Publication 515 states that every withholding agent, U.S. or foreign, files Forms 1042 and 1042-S.

What the report contains: Form 1042-S boxes and the four sections of Form 1042

Form 1042-S: one slip per recipient, income type and rate

A separate Form 1042-S is required for each recipient, each income type paid to that recipient (set by the income code in box 1) and each amount taxed at a different rate. A U.S. financial institution, or a U.S. branch of an FFI, paying the same income type to several accounts of one recipient at its U.S. office files a form per account. For foreign joint owners, the agent may issue a single form made out to the owner whose status set the rate, but must furnish a separate form to any owner that asks for its own; no form may name two joint owners.

Each form carries a unique form identifier: numeric, exactly 10 digits, never the recipient’s U.S. TIN or foreign TIN, unique to each original form for the year and reusable in a later year. An amendment repeats the identifier, checks “Amended” and carries a one-digit amendment number, starting at “1”.

Boxes What goes there Rule to watch
1 Two-digit income code (Appendix A) Most specific code; code 23 (other income) only when no other fits
2 Gross income paid in the year, including tax withheld Cannot be zero, except on an amendment zeroing out an earlier amount
3 Chapter indicator, “3” or “4” One per form; “3” where nothing was withheld under either chapter
3a, 3b Chapter 3 exemption code and tax rate For 2026, reduced chapter 3 withholding rates below 30% generally require the applicable exemption code, including reduced statutory rates. If the tax rate in box 3b is due to backup withholding, leave box 3a blank. For section 5000C payments (income code 44), enter exemption code 00 in box 3a and rate 02.00 in box 3b
4a, 4b Chapter 4 exemption code and tax rate Generally completed; a 00.00 rate in box 4b requires the applicable chapter 4 exemption code in box 4a. Exception: boxes 4a and 4b need not be completed for payments subject to section 5000C withholding
5, 6 Withholding allowance and net income Only income codes 16 to 20 and 42, with a treaty exemption up to a fixed amount
7a to 7d Tax withheld; escrow, subsequent-year partnership and pool-revision checkboxes Box 7a completed in all cases, “-0-” if nothing was withheld
8 to 11 Other agents’ withholding, overwithheld tax repaid, total credit, tax paid from own funds Box 10 adds 7a, 8 and 9; box 11 stays out of box 10
12a to 12m Withholding agent’s EIN, status codes, name, GIIN, country, FTIN and address Both status codes are generally required. For section 5000C payments, however, chapter 3 and chapter 4 status-code boxes need not be completed. The withholding agent’s EIN must not be truncated
13a to 13p Recipient’s name, country, address, U.S. TIN, status codes, GIIN, FTIN, LOB code, account number, date of birth Date of birth as YYYYMMDD
14a, 14b Primary withholding agent’s name and EIN Completed when box 8 is used
15, 15a to 15m Pro-rata checkbox; intermediary or flow-through entity details Required where documentation came with that entity’s Form W-8IMY
16a to 16e Payer’s name, TIN, GIIN and status codes Only where the payer differs from the box 12 agent
17a to 17c State income tax withheld State data only

Chapter 3 codes describe the type of recipient or agent (12 for a qualified intermediary, 15 a corporation, 16 an individual, 21 an unknown recipient). Chapter 4 codes describe FATCA status, such as 01 for a U.S. withholding agent that is a financial institution, 05 for a participating FFI and 42 to 49 for recalcitrant and similar pools. The chapter 3 pooled codes 27 to 32 are reserved for a QI, qualified securities lender, WP or WT; a U.S. withholding agent must not use them, and the instructions warn that an inappropriate recipient code may generate a notice.

Pools multiply the slip count. In Example 2 of the instructions, a U.S. agent pays dividends to a QI that is a participating FFI and does not assume primary withholding responsibility. The QI’s withholding statement puts 95% in a chapter 3 pool at 15% and 5% in a chapter 4 pool of recalcitrant account holders at 30%. The agent files two forms naming the QI: one with “3” in box 3, exemption code 04, rate 15.00, chapter 4 exemption code 15 and status codes 12 and 05; one with “4” in box 3, chapter 3 exemption code 12, chapter 4 rate 30.00 and status codes 12 and 49.

Where the presumption and intermediary-reporting rules require a Form 1042-S for an unidentified recipient, report “Unknown Recipient” and the applicable unknown-recipient status codes, and leave recipient country box 13b blank. For amounts subject to chapter 3 or chapter 4 withholding reported to an unknown recipient, the instructions require that 30% tax be withheld, remitted to the IRS and correctly reported on Form 1042-S. The presumption and payment-classification rules decide whether a payment without documentation is reportable on Form 1042-S and withheld upon at 30%. Country code “UC” identifies Curaçao and must not be used for an unknown country.

Form 1042: liability, totals, reconciliation and two flags

The header carries the agent’s name, EIN (or QI-EIN, WP-EIN or WT-EIN), both status codes whatever the payments, an amended-return box and a final-return box. A U.S. financial institution uses chapter 4 code 01 where its U.S. home office made payments on the form, otherwise code 50 (foreign branch of a financial institution) unless a more specific code fits.

  • Section 1, Record of Federal Tax Liability, lines 1 to 60: liability for each quarter-monthly period ending on the 7th, 15th, 22nd and last day of the month, with monthly totals. The heading says not to show deposits here, and no line may be negative.
  • Lines 61 to 64: the count of Forms 1042-S (paper and electronic), gross amounts on Forms 1042-S and Forms 1000, tax withheld by the agent and by others, adjustments, tax paid from own funds, and total net liability split into adjustments (64a), chapter 3 (64b), chapter 4 (64c) and the section 5000C tax (64d).
  • Lines 65 to 71: deposits in the calendar year (65a) and the subsequent year (65b), prior-year credit, credits for other agents’ withholding (67a and 67b), balance due or overpayment, and the credit-or-refund election with direct deposit details.
  • Section 2, Reconciliation of Payments of U.S. Source FDAP Income, lines 1 to 6: income withheld upon under chapter 4, income reportable but not withheld upon by reason (recipient status, excluded nonfinancial payment, grandfathered obligation, effectively connected income), and the variance against all Forms 1042-S. It is completed even with no chapter 4 withholding.
  • Sections 3 and 4: checkboxes for potential section 871(m) transactions and for payments by a qualified derivatives dealer (QDD), which needs a Schedule Q (Form 1042) for each QDD even at zero liability.

Units and signs are fixed. Amounts are in U.S. dollars, rounded to whole dollars (under 50 cents down, 50 to 99 cents up), keeping cents until a sum is totalled. Rates are entered as two digits, a point and two digits, so 4% is “04.00”. Repayments of overwithholding appear in parentheses in box 9 and on line 63c(1); the instructions’ arithmetic is $600 in box 7a, $120 in box 8 and ($50) in box 9 for $670 in box 10.

Form 1042-S reporting deadlines: 15 March, extensions and the deposit rhythm

Both returns are annual and cover the calendar year in which the income was paid. Form 1042, the IRS copies of Form 1042-S and the recipient copies are all due on 15 March of the following year; a Saturday, Sunday or legal holiday (in the District of Columbia or where the return is filed, for Form 1042-S) moves the date to the next business day. The calendar year now running is reported by 15 March of the next year, and electronically filed 2026 Forms 1042-S generally use IRIS, with an IRS-authorised IDES route for qualifying foreign filers whose authorised users lack an SSN or ITIN.

Item Extension route Length and limits
Form 1042 Form 7004, by the Form 1042 due date Automatic six months; does not extend payment
Form 1042-S, IRS copies Form 8809, by the Form 1042-S due date Automatic 30 days; a second 30 days possible, not automatic
Form 1042-S, recipient copies Form 15397, by fax One-time extension of up to 30 days, subject to IRS approval; Form 15397 must be received by the original recipient-furnishing due date

Form 7004 has a narrow reach. Publication 515 says it extends only the date for filing with the IRS, and not the date for furnishing statements to recipients, and the Form 1042 instructions add that interest runs on unpaid tax from the original due date even under an extension. Publication 515 also requires Form 8809 requests covering more than one withholding agent or payer to be submitted electronically.

Undeposited tax Deposit due
$2,000 or more at the end of a quarter-monthly period Within 3 business days after the period ends
At least $200 but under $2,000 at month end Within 15 days after month-end, unless a quarter-monthly deposit of $2,000 or more was made earlier that month. In that case, an end-of-month balance below $2,000 is carried forward to the next month, except in December
Under $200 at year end With Form 1042, or deposited by 15 March of the following year

Deposits go through EFTPS or IRS Direct Pay, and not using them may draw a 10% penalty. Business days exclude weekends and District of Columbia legal holidays, and standard EFTPS deposits must normally be scheduled by 8 p.m. Eastern time on the day before the due date. However, the Form 1042 instructions permit same-day EFTPS business-tax payments of $1 million or less submitted before 3 p.m. Eastern time on a business day, and describe a same-day wire alternative through the Federal Tax Collection Service. Where a December deposit of $2,000 or more was made under the quarter-monthly rule, an end-of-December balance under $2,000 is remitted with Form 1042 by 15 March.

For Form 1042, late filing costs 5% of the unpaid tax per month or part month, up to 25%, and late payment usually costs one-half of 1% per month, also capped at 25%. Publication 515 prices late deposits at 2% (1 to 5 days), 5% (6 to 15 days), 10% (16 days or more) and 15% where the deposit is not made within 10 days after the first IRS notice demanding payment. The 2026 Form 1042-S instructions set these per-form penalties for returns filed with the IRS:

When the correct Form 1042-S is filed Per form Annual maximum (small business)
Within 30 days after the due date $60 $698,500 ($244,500)
More than 30 days late, by 1 August $130 $2,095,500 ($698,500)
After 1 August, or not filed correctly $340 $4,191,500 ($1,397,000)
Intentional disregard Greater of $690 or 10% of the total amount of items required to be reported No maximum

A small business here has average annual gross receipts of $5 million or less over the three most recent tax years. Failing to furnish a correct recipient copy carries a parallel penalty of up to $340 per statement under the same ceiling, reduced where the correct statement goes out by 1 August.

Submission of Forms 1042 and 1042-S: MeF, IRIS and the paper route

Form 1042 through Modernized e-File

Form 1042 is e-filed through Modernized e-File (MeF), described for authorized e-file providers in Publication 4163. For Form 1042, the governing electronic-filing test under Regulations section 301.6011-15 generally counts all returns the withholding agent is required to file during the filing calendar year, including information returns, income-tax returns, employment-tax returns and excise-tax returns. It excludes individuals, estates and trusts from that particular requirement and separately covers withholding-agent partnerships with more than 100 partners. Financial institutions are subject to the rules in Regulations section 301.1474-1.

The 10-information-return test under Regulations section 301.6011-2 governs information returns such as Form 1042-S, not the complete Form 1042 return count. The 2025 Instructions for Form 1042 and Publication 515 (2026) describe a narrower information-return test; the final regulation governs the legal threshold. The IRS’s 2025 Form 1042 waiver page broadly directs U.S. and foreign withholding agents to MeF. Its wording must be read with the governing regulations described above, which carry exceptions the page does not reproduce.

The hardship-waiver process applies only to an agent that those regulations legally require to e-file. A hardship waiver is a written request headed “Form 1042 e-file Waiver Request”, sent by fax or mail to the Ogden Submission Processing Center by 15 March, or 45 days before the extended due date. Paper returns go to Internal Revenue Service, P.O. Box 409101, Ogden, UT 84409.

Form 1042-S through IRIS

Form 1042-S must be e-filed by anyone required to file 10 or more information returns in the year, by a partnership with more than 100 partners and by any financial institution, U.S. or foreign, whatever the count. An agent whose originals had to be e-filed e-files its amendments too, and never sends the same returns on paper as well; the instructions warn that duplicates may trigger penalty notices. The hardship waiver is Form 8508, at least 45 days before the due date.

IRIS has two routes. The Taxpayer Portal, documented in Publication 5717, is a free web system for up to 100 returns at a time, keyed in or uploaded as .csv. IRIS Application to Application (A2A), specified in Publication 5718, takes XML from third-party or in-house software.

The IRIS Taxpayer Portal and A2A channels require the appropriate IRIS Transmitter Control Code (TCC). A separate route applies to eligible foreign filers whose authorised users have neither an SSN nor an ITIN. Those filers use the IRS Foreign Filer TCC Registration System to obtain a TCC GIIN and a Foreign Filer TCC, then enrol in the International Data Exchange Service (IDES) to transmit Forms 1042-S and other applicable information returns. A Foreign Filer TCC cannot be used for IRIS. Foreign filers whose authorised users have an SSN or ITIN must instead use the ordinary IRIS TCC application and the applicable IRIS submission channel.

IRIS schema and business-rule packages are distributed through the Secure Object Repository mailbox, which the IRS schema page limits to users with an active e-Services account, a completed and active IRIS Transmitter Control Code application and an IRIS role of Software Developer or a business structure such as State Government Agency. The IRS schema page lists Form 1042-S in the TY2022 to TY2026 packages. IRIS also takes corrections and automatic extension requests. The TCC application and the Portal and A2A routes are shared with other information returns, such as the broker return in our Form 1099-DA reporting guide.

FIRE, the legacy system specified for Form 1042-S in Publication 1187, is scheduled for retirement. The IRS has announced 1 November 2026 as the last day for test filings, 9 November 2026 as the last day for changes to FIRE Information Returns TCC applications and 19 November 2026 at 3 p.m. Eastern time as the last day for information-return filings through FIRE. Following FIRE’s retirement, IRIS replaces FIRE for the information returns previously received through that system, including Forms 1042-S and their corrections. Publication 515 (2026) directs certain prior-year and foreign-filer Form 1042-S submissions to FIRE during the transition, subject to the announced production-filing cutoff of 19 November 2026 at 3 p.m. Eastern time.

For filing season 2027, qualifying foreign filers whose authorised users lack an SSN or ITIN have a separate IRS-authorised IDES route using a Foreign Filer TCC. IRIS does not replace the other applicable information-return submission systems, including AIR for Affordable Care Act information returns, IDES for FATCA Form 8966 and Social Security Administration filing for Forms W-2.

The paper route and recipient copies

Below the e-file thresholds, Copy A of a paper Form 1042-S goes to the IRS with Form 1042-T, Annual Summary and Transmittal of Forms 1042-S, one Form 1042-T per type of Form 1042-S. Copies B, C and D go to the recipient and must match Copy A. Substitute forms follow Publication 1179, one form per page and one per income type. The recipient’s TIN and foreign TIN may be truncated to the last four digits on Copies B, C and D, never on Copy A. Regulations section 1.1461-1(c)(1)(i) allows electronic furnishing of the recipient copy where the agent meets the requirements that paragraph cross-references.

Neither set of instructions, nor Publication 515, sets a file-naming convention for Form 1042-S submissions; IRIS transmission rules sit in Publications 5717 and 5718 and the schema packages. The Form 1042-S instructions tell agents to keep a copy of the returns, or the ability to reconstruct the data, for at least three years after the reporting due date.

Validation of Forms 1042 and 1042-S: the tie-outs and the IRS’s common-error lists

The Form 1042 instructions write the arithmetic checks line by line, the nearest thing the regime has to a published validation rule set. Amounts held in escrow (box 7b) stay out of the tie-out until the year they are deposited.

Form 1042 Must equal
Section 1 monthly totals (lines 5, 10, 15 and so on to 60) Lines 64b, 64c and 64d
Line 61 Number of Forms 1042-S filed, paper and electronic
Line 62a Box 2 FDAP income on all Forms 1042-S, less substitute payments on line 62b
Lines 63a plus 63c(2) Box 7a on all Forms 1042-S
Lines 63b(1) plus 63b(2) Box 8 on all Forms 1042-S
Line 63c(1) Box 9 on all Forms 1042-S
Line 63d Box 11 on all Forms 1042-S
Line 67 Box 8 on all Forms 1042-S the agent files
Section 2, line 4 Line 62c

A non-zero Section 2 variance on line 5 needs an explanation on line 6. Line 64a adjustments stay out of Section 1. The line 67 credit for other agents’ withholding must be supported by attached Forms 1042-S or 1099, and the instructions state that without them the refund or credit will be denied.

Section 1 goes wrong when it is filled from the deposit ledger. It records liability for the period in which the income was paid, whether satisfied by withholding or from the agent’s own funds, and the form heading excludes deposits. An extract of EFTPS payments will not generally reproduce it, because deposits follow the deposit schedule while liability follows payment dates.

The IRS’s “Avoid Common Errors” list describes the generally required information, including the unique form identifier and the applicable fields in boxes 1, 2, 3, 7a, 12a to 12m and 13a to 13h. Additional chapter 3 and chapter 4 fields depend on the payment and recipient status. These general field requirements must be read alongside specific exceptions: for section 5000C payments, the instructions do not require boxes 4a, 4b or either chapter-status-code field. The GIIN requirements for relevant FATCA statuses must also be applied according to the specific recipient or intermediary instructions.

Codes come only from the instructions’ lists and rates only from the Valid Tax Rate Table, without blending, so a payment withheld at two rates becomes two forms. Exemption code 04 (treaty) needs a treaty country in box 13b. The Form 1042 list adds both status codes and the correct EIN on every return.

Rejection codes are a gap in the published guidance. Neither the instructions nor Publication 515 lists IRIS business-rule identifiers or rejection messages for Form 1042-S; those come with the schema package.

Corrections follow two paths. A Form 1042-S already filed with the IRS is corrected by an amended form with the same identifier, the “Amended” box and the next amendment number, and an amended copy given to a recipient must also be filed. A form furnished but not yet filed is corrected by filing an original with the right data, with no amended box or number, and giving the recipient a copy. If the correction changes Form 1042, Form 1042 is amended too: check the box, complete the whole form, sign it and attach an explanation. Form 1042 is never amended to recover prior-year overwithholding.

Caveats and interactions: neighbouring forms, the multiple withholding agent rule and adjustments

Neighbouring returns take several payments that look like Form 1042-S material. Wages on Form W-2 stay off it, except dependent personal services compensation where the beneficial owner claims treaty benefits, and income tax withheld from a nonresident alien employee’s wages goes on Form 941. Partnerships other than publicly traded partnerships report section 1446 withholding on effectively connected taxable income on Forms 8804 and 8805. Where a participating FFI elects backup withholding under section 3406 instead of chapter 4 withholding for certain recalcitrant account holders, that tax goes on Form 945.

The FATCA report is separate again: Publication 515 requires a withholding agent making a withholdable payment to a passive NFFE with substantial U.S. owners, or to a relevant owner-documented FFI, to report the applicable payment and U.S. owners on Form 8966 by 31 March of the following year. An exception applies where the payment is made to an account already reported by an FFI as a U.S. account under its applicable FATCA or intergovernmental-agreement obligations. Forms 1042 and 1042-S may also be required where the payment is reportable under chapter 3. Our Form 8966 FATCA reporting guide covers that filing.

A payment is withheld under chapter 3 or chapter 4, and where both apply chapter 4 takes precedence; the agent may credit chapter 4 withholding against its section 1441, 1442 or 1443 liability. Payments subject to sections 1445 and 1446 sit outside chapter 4 withholding.

The multiple withholding agent rule may remove a Form 1042-S filing obligation only where another withholding agent has filed a return reporting the same amount to the same recipient and the applicable withholding has been performed correctly. The rule does not remove reporting obligations for specified payments to QIs, QSLs, WPs, WTs or U.S. branches treated as U.S. persons, or for agents that must report amounts they themselves withheld. An NQI or flow-through entity that knows, or has reason to know, that another withholding agent has underwithheld must still meet its applicable withholding and Form 1042-S reporting obligations.

In Example 18 of the instructions, a U.S. agent pays a $100 dividend to an NQI for investors A (treaty rate 15%) and B (30%), splitting it equally, and withholds only 15% on the whole payment. The NQI need not file for A. For B, the NQI knows the agent underwithheld, so it withholds the extra 15% and files a Form 1042-S showing $7.50 in box 7, the U.S. agent’s $7.50 in box 8 and $15 in box 10.

Overwithholding has a hard window. Discovered by 15 March of the following year, it can be repaid from undeposited tax or through the reimbursement or set-off procedure, completed before the earlier of filing the Form 1042-S and its due date (generally 15 March). Both current sets of instructions allow reliance on the proposed regulations, which stretch that window to the extended Form 1042-S due date while the form is neither filed nor furnished. Underwithholding can be made up from later payments or property the agent holds, before the unextended Form 1042 due date.

Treaty changes outside the forms feed straight into boxes 3a and 3b. Publication 515 (2026) records that parts of the Russia treaty were suspended from 16 August 2024, so the statutory 30% rate applies to recipients who previously qualified; that the Hungary treaty ceased to apply to taxes withheld at source from 1 January 2024; and that a partial suspension of the USSR treaty as it applies to Belarus, in effect from 17 December 2024 until 31 December 2026 or earlier by mutual agreement, bars treaty claims on interest on trade-financing debt paid to Belarusian residents. The partner-jurisdiction side of FATCA, where Model 1 institutions report locally, is covered in our FATCA reporting guide for Ireland.

The escrow procedure is the last carve-out. An agent that cannot determine the portion of a payment subject to withholding, for example because the source is unknown, may withhold 30% of the whole payment and hold it in escrow; the tax falls due at the earlier of the determination or one year after escrow, and is reported for the year it must be deposited.

Changes to Forms 1042 and 1042-S: IRIS replaces FIRE, the exemption-code rule and the box 13 correction

The 2026 Form 1042-S, the first filed in the 2027 season, brings these changes:

  • IRIS replaces FIRE. Form 1042-S became available for electronic submission through IRIS on 1 January 2026. IRIS is the ordinary electronic-filing route for 2026 Forms 1042-S, with an IRS-authorised IDES alternative for eligible foreign filers whose authorised users lack an SSN or ITIN. For the 2025 reporting year, IRIS and FIRE were both available subject to the applicable transitional filing rules.
  • A chapter 3 exemption code is generally required where withholding is below 30%, including reduced statutory rates. For example, a scholarship withheld at the 14% rate under section 1441(a) now carries exemption code 02 in box 3a. If the reported rate arises from backup withholding, however, box 3a must be left blank. A separate exception applies to section 5000C payments: use income code 44, exemption code 00 in box 3a and rate 02.00 in box 3b.
  • Address fields are split into individual boxes; on the 2026 form the recipient’s address runs from box 13c to 13h, the recipient status codes sit in boxes 13j and 13k and the LOB code in box 13n.
  • Income codes 59 (consent fees), 60 (loan syndication fees) and 61 (settlement payments) stay optional for 2026.
  • The IRS lists a post-release correction dated 14 September 2026 concerning box 13 references in the 2026 Form 1042-S. On the 2026 form, the recipient’s chapter 3 and chapter 4 status codes appear in boxes 13j and 13k, and the limitation-on-benefits code appears in box 13n.

Substitute payment rules have moved too. The Notice 2010-46 credit forward framework for substitute dividends in chains of securities loans or repos ended after 31 December 2024, so no agent, including a qualified securities lender, may claim credit for prior withholding on those payments on line 67b or in box 8. Notice 2024-44 extended specified qualified securities lender (QSL), qualified derivatives dealer (QDD) and section 871(m) transition relief through 2026.

Notice 2026-61, released on 21 September 2026, further extends specified relief through 2028: withholding agents may apply the QSL transition rules to payments made in 2027 and 2028, and specified QDD good-faith and periodic-review relief continues through 2028. The notice also extends the section 871(m) phase-in, generally limiting covered transactions to delta-one transactions through 2028, subject to the anti-abuse rule. The discontinued credit-forward framework is not reinstated. The notice announces that the Treasury and the IRS intend to amend the regulations, so the relief rests on the notice until those amendments are made. Notice 2025-63, released on 23 October 2025, announced that the Treasury and the IRS intend to issue proposed regulations sourcing certain borrow fees by the recipient’s residence, with reliance allowed for securities lending and sale-repurchase transactions entered into before those regulations are published; a QI or similar agent relying on it for a collective refund attaches the Forms 1042-S received and a statement of reliance.

Form 1042 e-filing has arrived slowly. The requirement first applied to 2023 forms filed in 2024, but Notice 2024-26 exempted all withholding agents from e-filing Form 1042 in calendar year 2024 and foreign agents in 2025, and the IRS later extended the exemption to U.S. agents for 2025 filings. The 2025 form added direct deposit lines 71b to 71d. An early-release draft of the 2026 Form 1042, created on 13 April 2026 and marked not for filing, keeps the four-section layout and numbered lines of the 2025 form; the final 2026 form and instructions are the editions to check before the 2027 season.

Frequently Asked Questions

A REIT declares a dividend in December and pays it in January. Which year’s Form 1042 carries it?

The prior year’s, in the instructions’ example. Section 857(b)(9) treats the dividend as paid on 31 December. If the REIT withholds when it pays in January under the underwithholding procedures, it reports the liability on the prior-year Form 1042 and designates the deposit to that year; in the 2025 example the deposit had to be made by 16 March 2026, that year’s Form 1042 due date.

We found overwithholding in May. Can we still repay the recipient and adjust Form 1042?

Generally not. For overwithholding discovered after 15 March, the instructions say not to adjust the prior-year liability or deposits and not to repay the beneficial owner, unless the agent is a QI, WP, WT, participating FFI or reporting Model 1 FFI making a collective refund claim. The proposed-regulation window helps only up to the extended Form 1042-S due date and while the form is unfiled and unfurnished. Otherwise the recipient claims the tax back on Form 1040-NR or Form 1120-F, or by amended return if one was already filed.

One joint owner asks for its own Form 1042-S after we filed in the other owner’s name. What now?

The instructions say the agent should amend the filed form to allocate the payment and tax withheld among the joint owners, and provide copies of the amended forms to each recipient. The amounts and tax across all the forms cannot exceed what was actually paid and withheld.

A paying agent files our Forms 1042-S. Whose details go where?

The agent is an authorized agent only if five conditions hold: a written agreement; Form 8655 if it files Form 1042 in its own name; its books, records and relevant personnel available to the payer; the payer staying fully liable without asserting defences; and, where it files Form 1042 in its own name, the agent reported in boxes 12a to 12m and the payer in boxes 16a to 16e.

A section 305(c) deemed distribution produced no cash. When does the liability go on Form 1042?

In the instructions’ example, a deemed distribution on 15 August 2025 is withheld from the next interest payment on 15 February 2026. The liability goes on line 59 of the Form 1042 for the year of the deemed distribution, the tax withheld in the next year on line 63c(2) and the deposit on line 65b.

A payment was withheld at 30% under chapter 4, but a treaty would have given 15% under chapter 3. Can the slip show that?

Yes. The instructions allow a chapter 3 exemption code and rate in boxes 3a and 3b showing the rate that would apply if the payment were later found exempt from chapter 4, with “4” kept in box 3, to help the beneficial owner with a refund claim. The default alternative is chapter 3 exemption code 12 (payee subjected to chapter 4 withholding).

Key Takeaways

  • For IRIS filing, obtain the appropriate IRIS TCC before the filing season opens and choose the Taxpayer Portal for small batches or A2A for XML feeds. Eligible foreign filers whose authorised users lack an SSN or ITIN instead require a Foreign Filer TCC and IDES enrolment to transmit their information returns.
  • Count Forms 1042-S by recipient, income code and rate before year end; the count feeds line 61 and, with other information returns, the 10-return e-file test.
  • Build Section 1 of Form 1042 from payment dates and prove it against lines 64b to 64d before comparing it with the EFTPS history.
  • Issue the 10-digit unique form identifier at origination and store it with the slip; every amendment repeats it.
  • If recipient copies may be late, submit Form 15397 by fax so the IRS receives it by the original furnishing deadline, and obtain approval for an extension of up to 30 days. Do not treat submission alone as an automatic extension. Forms 7004 and 8809 do not extend the recipient-furnishing deadline.
  • Map reduced chapter 3 withholding rates below 30% to the applicable box 3a exemption code, including reduced statutory rates. Where the rate results from backup withholding, leave box 3a blank. For section 5000C payments, use exemption code 00 in box 3a and tax rate 02.00 in box 3b.
  • Recheck treaty-rate slips for Russian, Belarusian and Hungarian recipients against the Publication 515 treaty notices before using exemption code 04.

Sources and References

Before 15 March: the slip population, the Form 1042 tie-out and the IRIS credentials

The payment population is classified by recipient, income code, chapter and rate so that each Form 1042-S exists once under its identifier; Section 1 is built from payment dates and proved against lines 64b to 64d, and Section 2 against line 62c; and the required IRIS or IDES credentials and applicable submission route are ready. With those three artifacts ready, Forms 1042 and 1042-S go to the IRS, and recipient copies to recipients, by 15 March of the year after the payments.

Disclaimer: The information on RegReportingDesk.com is for educational and informational purposes only. It does not constitute legal, regulatory, tax, or compliance advice. Always consult your compliance officer, legal counsel, or the relevant supervisory authority for guidance specific to your institution.

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