Chapter 3 and Chapter 4 Withholding

Chapter 3 and Chapter 4 are the two US federal withholding regimes that govern payments to foreign persons. They both default to a 30 percent rate, and they often apply to the same payment, so the practical task for a US payer is knowing which one controls. The IRS lays out both in Publication 515 and on its NRA withholding page.

Chapter 3: NRA Withholding

Chapter 3 is what most people mean by NRA withholding. It requires withholding under Internal Revenue Code sections 1441, 1442, and 1443 on payments of US-source income to foreign persons. The IRS states that “most types of U.S. source income received by a foreign person are subject to U.S. tax of 30%.” The regime applies to FDAP income, which is fixed, determinable, annual, or periodical income from US sources.

The Chapter 3 question is about the payee: is the recipient a foreign person, and is the income US-source? If yes, the default is 30 percent, which a valid tax treaty claim can reduce or remove.

Chapter 4: FATCA Withholding

Chapter 4 is the FATCA regime, found in Internal Revenue Code sections 1471 through 1474. It applies to a “withholdable payment,” which Publication 515 describes as a payment of US-source FDAP income. Chapter 4 was built for a different purpose than Chapter 3. Rather than collecting tax on a foreign person’s US income, it is designed to force certain foreign financial institutions and nonfinancial foreign entities to disclose their US account holders and owners. The pressure is a 30 percent withholding tax on withholdable payments to such an institution or entity that has not met its FATCA documentation and reporting obligations.

The Chapter 4 question is about entity type and FATCA status, not simply whether the payee is foreign.

When Both Apply, Chapter 4 Wins

A single payment of US-source FDAP income to a foreign entity can fall within both chapters at once. The Code resolves the overlap with a priority rule. Publication 515 states that “if a withholding agent makes a payment subject to both chapter 4 withholding and chapter 3 withholding, the withholding agent must apply the withholding provisions of chapter 4, and need not withhold on the payment under chapter 3 to the extent that it has withheld under chapter 4.” In plain terms, the payer applies Chapter 4 first and does not double-withhold the same dollar.

What a US Payer Actually Does

For a US company paying a foreign vendor or entity, the steps come together through documentation:

1. Collect a valid W-8 from the foreign payee. The W-8BEN or W-8BEN-E establishes foreign status for Chapter 3 and reports the FATCA status that governs Chapter 4.
2. Determine the Chapter 4 status first. If the payee is outside Chapter 4 withholding, no Chapter 4 tax applies.
3. Then apply Chapter 3, starting from the 30 percent default and any treaty reduction the W-8 supports.
4. Report on Form 1042-S and the annual Form 1042.

The party responsible for all of this is the withholding agent, which is personally liable for tax it should have withheld.

Why It Matters for US Companies

Most US companies paying individual foreign contractors deal mainly with Chapter 3, because the contractor is a foreign person and the question is source and treaty rate. Chapter 4 becomes the live issue when the payee is a foreign entity, especially a financial one, that has not provided clean FATCA documentation. Getting the W-8 right up front answers both chapters at once.

How Omnivoo Helps

Omnivoo Contract Management collects and validates the W-8 documentation for each foreign payee, sorts payments by US source, and applies the correct rate, so the Chapter 3 and Chapter 4 analysis is settled before money moves.