Chapter 3 vs Chapter 4 (FATCA): The 2026
Guide for US Withholding
Agents
Reviewed by Omnivoo Compliance Team on May 30, 2026
Chapter 3 (IRC 1441 to 1443, 1461) is the regular NRA withholding regime: 30 percent at source on FDAP US-source income paid to foreign payees, reduced by treaty. Chapter 4 (IRC 1471 to 1474, FATCA) is a separate 30 percent withholding aimed at non-compliant Foreign Financial Institutions and certain Non-Financial Foreign Entities. A US withholding agent applies chapter 4 first. If chapter 4 withholding applies to a payment, chapter 3 does not also apply. Form W-8BEN-E documents both chapter 3 status and chapter 4 status on one form.
Two regimes, two policy goals, one coordination rule.
Chapter 3 taxes the foreign payee's US-source income. Chapter 4 pressures foreign institutions to disclose US account holders. A single payment can sit inside both definitions, so the IRS made chapter 4 apply first.
| Chapter 3 | Chapter 4 (FATCA) | |
|---|---|---|
| What it is | The regular NRA withholding regime on US-source FDAP income paid to foreign payees. IRS NRA Withholding page. | A separate 30 percent withholding regime aimed at non-compliant Foreign Financial Institutions and certain Non-Financial Foreign Entities. IRS FATCA overview. |
| IRC section | IRC 1441 (individuals), IRC 1442 (foreign corporations), 1443 (foreign tax-exempt orgs), 1461 (liability of withholding agent). | IRC 1471 (FFIs), IRC 1472 (NFFEs), 1473 (definitions), 1474 (special rules). |
| Who it targets | Foreign payees: NRA individuals, foreign corporations, foreign partnerships, foreign estates, foreign trusts receiving US-source FDAP. Publication 515. | Foreign Financial Institutions (FFIs) and Non-Financial Foreign Entities (NFFEs). IRC 1471 and IRC 1472. |
| What triggers 30 percent | Paying US-source FDAP to a foreign payee with no valid treaty-claim documentation on file. IRS NRA Withholding. | Making a withholdable payment to a non-compliant FFI, or to a passive NFFE that fails to disclose substantial US owners. IRC 1471. |
| How a payee avoids 30 percent | Deliver Form W-8BEN (individual) or W-8BEN-E (entity) claiming a treaty rate, or Form W-8ECI for effectively connected income. Publication 515. | Deliver Form W-8BEN-E documenting a compliant chapter 4 status (participating FFI with a GIIN, certified deemed-compliant FFI, active NFFE, passive NFFE with no substantial US owners). About Form W-8BEN-E. |
| Reporting forms | Form 1042 (annual) and Form 1042-S (per recipient), filed by the US withholding agent. About Form 1042. | Form 1042 and Form 1042-S for the withholding agent's chapter 4 amounts. Form 8966 is the FATCA Report filed by FFIs and certain NFFEs, not by ordinary US operating-company payers. About Form 8966. |
The regular NRA withholding regime on US-source FDAP.
Chapter 3 lives in IRC 1441 (withholding on nonresident alien individuals), IRC 1442 (withholding on foreign corporations), IRC 1443 (foreign tax-exempt organizations), and IRC 1461 (liability of the US withholding agent). The IRS NRA Withholding page restates the rule plainly: most types of US source income received by a foreign person are subject to US tax of 30 percent, and the tax is generally withheld (NRA withholding) from the payment made to the foreign person.
The withholdable income category is FDAP: fixed, determinable, annual, or periodical income. The covered payees are NRAs, foreign corporations, foreign partnerships, foreign estates, and foreign trusts. The default rate is 30 percent on the gross. A tax treaty can reduce that rate or zero it out, but only if the foreign payee delivers a valid Form W-8BEN (individual) or Form W-8BEN-E (entity) certifying foreign status and claiming the treaty benefit. Publication 515 is the operating manual for chapter 3 documentation, validity periods, and reporting.
The US payer is the withholding agent and bears the legal liability under IRC 1461 if it pays a foreign person without withholding when withholding was required. The payee does not separately file a US return on properly withheld FDAP in most cases. The receipt is the Form 1042-S, which the payee uses to claim a foreign tax credit at home.
A 30 percent stick aimed at foreign institutions, not the income.
Chapter 4 was enacted by the HIRE Act in 2010 and is codified at IRC 1471 through 1474. The IRS FATCA overview states that FATCA generally requires foreign financial institutions and certain other non-financial foreign entities report on the foreign assets held by their US account holders or be subject to withholding on withholdable payments. The goal is disclosure, not revenue. The 30 percent withholding is the enforcement mechanism, not the policy itself.
The two payee categories are an FFI (Foreign Financial Institution under IRC 1471, broadly a foreign bank, custodial institution, investment entity, or specified insurance company) and an NFFE (Non-Financial Foreign Entity under IRC 1472, the catch-all for any foreign entity that is not an FFI). Most foreign operating companies that a US business actually pays (a German GmbH, a UK Ltd, a Singapore Pte Ltd selling services) are NFFEs.
An FFI shows compliance by registering with the IRS and getting a GIIN (Global Intermediary Identification Number) and by entering an FFI agreement, or by qualifying as a deemed-compliant or exempt beneficial owner under the regulations. An NFFE shows compliance by documenting its category on Form W-8BEN-E: active NFFE (less than 50 percent passive income and assets), passive NFFE with no substantial US owners, passive NFFE that discloses its substantial US owners, direct reporting NFFE, or one of the excepted NFFE categories. About Form W-8BEN-E confirms the form documents status for purposes of chapter 3 and chapter 4.
The 30 percent chapter 4 tax under IRC 1471(a) applies in the case of any withholdable payment to a foreign financial institution which does not meet the documentation requirements. Parallel language in IRC 1472 does the same job for non-compliant NFFEs.
Chapter 4 applies first. No stacking.
The two regimes overlap because the chapter 4 term withholdable payment is defined in IRC 1473 to include US-source FDAP, which is exactly what chapter 3 already taxes. A US interest, dividend, royalty, or service-fee payment to a foreign payee can therefore fall inside both definitions at the same time.
The coordination rule is straightforward: a US withholding agent evaluates chapter 4 first. If the payment is a withholdable payment and the payee has not delivered compliant chapter 4 documentation, the agent withholds 30 percent under chapter 4 and does not also apply chapter 3 to that same payment. If the payee's chapter 4 documentation is good, the agent then evaluates chapter 3 on the same dollar (treaty claim, FDAP code, rate). The result is one 30 percent tax, not two. Publication 515 sets out the coordination on the documentation side.
The reporting side reflects the same logic. About Form 1042 states that the return reports the tax withheld under chapter 3 on certain income of foreign persons, including nonresident aliens, foreign partnerships, foreign corporations, foreign estates, and foreign trusts, and the tax withheld under chapter 4 on withholdable payments. The same Form 1042-S records the payment, with separate fields for chapter 3 and chapter 4 codes so the IRS sees which regime drove the withholding.
One form covers both chapter 3 and chapter 4.
Form W-8BEN-E is the form a foreign entity gives to a US withholding agent. The IRS About Form W-8BEN-E page is unambiguous: Form W-8BEN-E is used by foreign entities to document their status for purposes of chapter 3 and chapter 4, as well as other code provisions.
Part I of the form collects chapter 3 information: legal name, country of incorporation, chapter 3 entity status (corporation, partnership, simple trust, grantor trust, complex trust, estate, government, central bank of issue, tax-exempt organization, private foundation, international organization), and any US TIN. Item 5 of Part I is the chapter 4 FATCA status checkbox, and the rest of the form (Parts IV through XXIX in the current revision) contain the specific certifications for each chapter 4 status. A passive NFFE with no substantial US owners, for example, completes Part XXVI. A participating FFI completes Part IV and provides its GIIN.
Related forms in the W-8 series cover other payee types. Form W-8BEN is the individual analog (chapter 3 only, no FATCA section, because individuals are not FFIs or NFFEs). Form W-8ECI certifies effectively connected income and is the right form when chapter 3 and chapter 4 both step aside because the foreign payee is taxed on a net basis as if it were a US person. Form W-8IMY is for intermediaries (Qualified Intermediaries, Withholding Foreign Partnerships, Withholding Foreign Trusts, and certain flow-through entities) and is the most complex of the four. Publication 515 walks through which form fits which payee.
1042, 1042-S, and Form 8966.
A US withholding agent files Form 1042 annually. The IRS About Form 1042 page describes the return as covering the tax withheld under chapter 3 on certain income of foreign persons, including nonresident aliens, foreign partnerships, foreign corporations, foreign estates, and foreign trusts, and the tax withheld under chapter 4 on withholdable payments. The form reconciles the agent's total US-source payments to foreign payees, chapter 3 tax withheld, chapter 4 tax withheld, deposits made during the year, and any balance due or refund.
Per-recipient detail goes on Form 1042-S. One 1042-S is filed for each foreign recipient that received a reportable payment in the calendar year. The form carries separate chapter 3 and chapter 4 codes, separate exemption codes, separate rate fields, and separate tax-withheld fields. The reconciliation of all 1042-S forms back to the 1042 totals is the agent's main year-end compliance task.
Form 8966 is the FATCA Report. The IRS About Form 8966 page lists who files it: filers report information with respect to certain US accounts, substantial US owners of passive NFFEs, specified US persons that own certain debt or equity interests in owner-documented FFIs, and certain other accounts as applicable based on the filer's chapter 4 status. In practice the filers are FFIs, sponsoring entities, direct reporting NFFEs, and certain trustees. A US operating company that pays a foreign contractor does not file Form 8966. Its FATCA story ends with the chapter 4 line on the 1042 and the chapter 4 codes on the 1042-S.
Three payments, three different paths.
Example 1. US company pays a German GmbH for software development, clean W-8BEN-E on file. The German GmbH delivers a Form W-8BEN-E that documents itself as a corporation for chapter 3, checks the active NFFE box for chapter 4 FATCA status in Part I Item 5, and completes Part XXV (active NFFE certification). Chapter 4 documentation is good, so no chapter 4 withholding applies. The US payer then evaluates chapter 3. The payment is for software development services performed in Germany, which is foreign-source under the source-of-services rule and is therefore outside the chapter 3 FDAP base entirely. No withholding under either chapter. The payer still reports on Form 1042-S if the payment is reportable, with the appropriate exemption codes. About Form W-8BEN-E confirms the form is the chapter 3 and chapter 4 documentation.
Example 2. US company pays a Cayman Islands financial entity that has not provided a W-8BEN-E. The Cayman entity looks and walks like an FFI under IRC 1471 (an investment entity in a non-IGA jurisdiction). It has not delivered compliant chapter 4 documentation. The payment is a withholdable payment of US-source interest. Chapter 4 applies first: the US payer must withhold 30 percent under IRC 1471(a). The IRS FATCA overview states that foreign financial institutions and certain other non-financial foreign entities are subject to withholding on withholdable payments unless they report on the foreign assets held by their US account holders. Because chapter 4 withholds, chapter 3 does not also apply to the same dollar.
Example 3. US company pays a Philippine individual contractor for services performed in the Philippines, clean W-8BEN on file. The payee is an individual, so chapter 4 does not apply at all (FATCA targets entities). Chapter 3 then asks whether the payment is US-source FDAP. The income is compensation for services, and the source-of-services rule looks to where the work is performed. Because the contractor performed the services entirely in the Philippines, the income is foreign-source and is outside chapter 3 withholding entirely. No 30 percent withholding, no 1042-S obligation. The clean Form W-8BEN documents the contractor's foreign status. Publication 515 sets out the source-of-services rule for chapter 3.
Where US AP teams trip on chapter 3 vs chapter 4.
- Assuming Form W-8BEN-E only covers chapter 3. The form does both. IRS About Form W-8BEN-E states that the form is used by foreign entities to document their status for purposes of chapter 3 and chapter 4. A W-8BEN-E with Part I Item 5 left blank is not a valid chapter 4 certification and exposes the US payer to 30 percent withholding under IRC 1471 or 1472 regardless of what chapter 3 says.
- Treating a small foreign LLC, GmbH, or Ltd as exempt from FATCA documentation. FATCA is not a size-based regime. Every foreign entity payee on a US-source withholdable payment is either an FFI or an NFFE. Most small foreign operating companies are NFFEs under IRC 1472 and they document the right NFFE category on Form W-8BEN-E. There is no de minimis exemption.
- Applying both chapter 3 and chapter 4 to the same payment. The coordination rule prevents stacking. If chapter 4 withholding applies, chapter 3 does not also apply to that same payment. Publication 515 sets out the documentation coordination that produces this outcome.
- Skipping the GIIN check for an FFI claiming compliant status. An FFI that ticks the participating-FFI or registered deemed-compliant FFI box on Form W-8BEN-E must provide a GIIN. The US payer should verify the GIIN against the IRS FFI List before relying on the form to skip chapter 4 withholding. The IRS FATCA overview links to the public FFI list for this purpose.
- Ignoring the Form 1042 chapter 4 reconciliation totals. About Form 1042 confirms the return covers both chapter 3 and chapter 4 amounts. A US payer that records every payment as chapter 3 on its 1042-S forms and reports zero chapter 4 on the 1042 reconciliation will not match its W-8 documentation file under audit. Make sure your books carry the correct chapter code at the payment level so the 1042 reconciles cleanly.
Where to go next.
The hub and supporting guides for the rest of the US payer workflow.
Free tooling for US payer compliance.
Frequently asked.
01 What is the difference between chapter 3 and chapter 4? +
Chapter 3 (IRC 1441 through 1443 and 1461) is the regular NRA withholding regime that imposes 30 percent at source on US-source FDAP income paid to a foreign payee, reduced by treaty. Chapter 4 (IRC 1471 through 1474, FATCA) is a separate 30 percent withholding tax aimed at non-compliant Foreign Financial Institutions and certain Non-Financial Foreign Entities. The IRS FATCA overview page describes FATCA as generally requiring that foreign financial institutions and certain other non-financial foreign entities report on the foreign assets held by their US account holders or be subject to withholding on withholdable payments. The IRS NRA Withholding page restates the chapter 3 rule that most types of US-source income received by a foreign person are subject to US tax of 30 percent.
02 Does a small foreign contractor need to deal with FATCA? +
Yes, in the documentation sense. A foreign entity that receives a US-source withholdable payment must give the US payer a Form W-8BEN-E that documents both its chapter 3 status and its chapter 4 status. The IRS About Form W-8BEN-E page states that Form W-8BEN-E is used by foreign entities to document their status for purposes of chapter 3 and chapter 4. A small foreign LLC, GmbH, or Ltd is typically a passive or active NFFE under IRC 1472, and it documents that status on the form rather than as a Foreign Financial Institution.
03 Does the same payment get withheld under both chapters? +
No. The withholding agent applies chapter 4 first. If chapter 4 withholding applies to a payment, chapter 3 does not also apply to that same payment. Publication 515 sets out the coordination rule so a single withholdable payment is taxed once at 30 percent, not twice.
04 What is an FFI? +
A Foreign Financial Institution. IRC 1471 defines the term broadly to include foreign banks, custodial institutions, investment entities, and certain insurance companies. The IRS FATCA page states that FATCA requires foreign financial institutions to report on the foreign assets held by their US account holders or be subject to withholding on withholdable payments. An FFI usually shows compliance by registering with the IRS and receiving a GIIN (Global Intermediary Identification Number).
05 What is an NFFE? +
A Non-Financial Foreign Entity. IRC 1472 covers withholdable payments to NFFEs and requires 30 percent withholding unless the NFFE either certifies that it has no substantial US owners or identifies them. Most foreign operating companies (a German GmbH, a UK Ltd, a Singapore Pte Ltd selling services to a US client) are NFFEs, not FFIs. They document the right NFFE category on Form W-8BEN-E.
06 What is a withholdable payment? +
IRC 1473 defines the term. In broad strokes, a withholdable payment is any payment of US-source FDAP income, plus (historically) gross proceeds from the sale of property that produces US-source interest or dividends. The chapter 4 withholdable-payment definition overlaps heavily with chapter 3 FDAP, which is why the coordination rule matters: the same dollar can fall inside both regimes and the chapter 4 rule applies first.
07 What is Form 8966 and do I file it? +
Form 8966 is the FATCA Report. The IRS About Form 8966 page states that Form 8966 is filed to report information with respect to certain US accounts, substantial US owners of passive NFFEs, specified US persons that own certain debt or equity interests in owner-documented FFIs, and certain other accounts as applicable based on the filer's chapter 4 status. A US operating company paying a foreign contractor does not file Form 8966. The filers are FFIs, sponsoring entities, and direct reporting NFFEs. The US withholding agent's chapter 4 reporting happens on Form 1042 and Form 1042-S.
08 How does a foreign entity show FATCA compliance? +
By delivering a complete and current Form W-8BEN-E to the US payer. Part I, Item 5 of the form is the chapter 4 FATCA status checkbox, and the form's later parts collect the specific certifications for that status (for example, active NFFE, passive NFFE with no substantial US owners, participating FFI with a GIIN, certified deemed-compliant FFI). The IRS About Form W-8BEN-E page confirms the form documents status for purposes of chapter 3 and chapter 4. Publication 515 covers how a withholding agent validates the form.
This guide is general information for US withholding agents, not legal or tax advice. The chapter 3 and chapter 4 classification of a single payment depends on the payee category, the source of the income, and the documentation on file, and any of those can change. Confirm every position against the current IRS guidance and IRC sections linked above, or work with a qualified US tax professional. Omnivoo does not act as the withholding agent on your contractor payments and the responsibility for Form W-8 collection, FATCA status validation, 1042 / 1042-S filing, and any Form 8966 filings remains with the US payer and the applicable filers respectively.