IRS Pub 515: Withholding Agents, W-8 Forms, and Form 1042

IRS Publication 515 is the agency’s guide for anyone who pays U.S.-source income to a foreign person and has to withhold federal tax before the money leaves the country. The default rule is simple and unforgiving: withhold 30% of the gross payment and send it to the U.S. Treasury, unless a tax treaty or a statutory exemption cuts the rate. If you should have withheld and didn’t, the IRS collects the shortfall from you, not from the foreign recipient.¹

Who Counts as a Withholding Agent

A withholding agent is any person or entity that controls, receives, or pays income to a foreign person. The definition is broad on purpose. It covers employers, lessees, fiduciaries, corporations, partnerships, financial institutions, and individuals — including someone paying rent to a foreign landlord.²

Your job as the agent is to deduct the right amount from the payment and remit it. If the amount is wrong, the IRS looks to you. Officers and other individuals with authority over a company’s funds can also be personally hit with the trust fund recovery penalty, which equals the full unpaid tax plus interest. Paying other business expenses while the withheld tax sits unremitted counts as willful in the IRS’s view.³

What Payments Are Covered

Publication 515 governs U.S.-source income classified as Fixed, Determinable, Annual, or Periodical — FDAP for short. That covers interest, dividends, rents, royalties, premiums, annuities, and compensation for services. FDAP payments are taxed on the gross amount, with no deductions, at the flat 30% rate unless something reduces it.⁴

Only U.S.-source income falls within the rules. Interest paid by a U.S. corporation is U.S.-source. Rent on U.S. property is U.S.-source. Compensation for services performed inside the United States is U.S.-source. A payment between two foreign parties for work done entirely abroad is foreign-source and sits outside Publication 515.⁵

Some payments look like they should be covered but aren’t. Proceeds from selling stock or personal property are generally not FDAP. Income that is effectively connected with a U.S. trade or business is taxed at graduated rates on a net basis instead of at the flat 30%. And sales of U.S. real property follow a separate withholding regime under FIRPTA, described below.

The 30% Default and How to Reduce It

The starting point for U.S.-source FDAP paid to a nonresident alien individual is a 30% tax on the gross amount.⁶ The same rate applies to foreign corporations.⁷ Gross means gross. Pay $10,000 in royalties and you withhold $3,000, no matter what the foreign person spent to earn the income.

The 30% applies automatically when the payee gives you nothing. Applying the full rate when you’re unsure is the safe move. The foreign person can always file a U.S. return to claim a refund if a lower rate applied.

Treaty Rates

The United States has income tax treaties with dozens of countries that lower the rate on specific income types. A treaty might drop dividends to 15%, royalties to 10%, or interest to 0%, depending on which treaty and which payment.

To claim a reduced rate, the payee gives you a properly completed Form W-8BEN (individuals) or Form W-8BEN-E (entities). The form certifies the payee’s country of residence and cites the specific treaty article. You can’t just accept the claim on faith. You have to check that the income type is actually covered by the article cited.

Most treaties also include a Limitation on Benefits provision — an anti-treaty-shopping rule that stops residents of third countries from routing payments through a treaty country to grab a lower rate. The payee has to satisfy at least one LOB test in the relevant treaty, and certifies which one on Form W-8BEN-E.⁸ Common tests cover individual residents, publicly traded corporations, government entities, and companies meeting ownership and base-erosion thresholds. Each treaty writes its own version, so read the treaty text.

Statutory Exemptions

Several exemptions in the Internal Revenue Code drop the rate to 0% regardless of the payee’s country. The big ones:

Portfolio interest. Interest on registered debt obligations qualifies if the beneficial owner certifies they are not a U.S. person. The exemption doesn’t apply if the lender holds 10% or more of the voting stock of a corporate borrower, or 10% or more of the capital or profits interest of a partnership borrower. Contingent interest tied to the borrower’s revenue, profits, or property values is also excluded.⁶

Bank deposit interest. Interest on deposits with U.S. banks, savings institutions, and insurance companies is exempt from the 30% tax, provided it isn’t effectively connected with a U.S. trade or business.⁶

Short-term original issue discount. OID on obligations maturing in 183 days or less from original issue sits outside the statutory definition of an OID obligation, so the 30% tax simply doesn’t reach it.⁶

Effectively connected income. Income that is effectively connected with a U.S. trade or business is taxed on a net basis at graduated rates rather than through 30% gross withholding. The foreign person hands you Form W-8ECI with a U.S. taxpayer identification number. Once you hold a valid W-8ECI, you stop withholding under Chapter 3, and the foreign person files their own U.S. return.⁹

All of these exemptions still require a valid W-8. No form, no exemption.

The W-8 Series

The W-8 forms are the whole documentation system. Without a valid one, you withhold 30%; with the right one, you can reduce or eliminate the tax.

Form W-8BEN. Used by nonresident alien individuals to certify foreign status and claim treaty benefits. Needs the person’s name, country of residence, and foreign tax ID.
Form W-8BEN-E. The entity version, used by foreign corporations, partnerships, and other entities. Requires detailed entity classification, Chapter 4 status, and any treaty claim including the LOB test satisfied.
Form W-8ECI. For income the payee claims is effectively connected with a U.S. trade or business. Must include a U.S. TIN.¹⁰
Form W-8IMY. For foreign intermediaries, flow-through entities, and certain U.S. branches receiving payments for others. It usually comes paired with a withholding statement and the W-8 or W-9 forms of the actual beneficial owners.¹¹

A Form W-8BEN is generally valid from the date it’s signed until the last day of the third succeeding calendar year. A form signed March 1, 2026, is valid through December 31, 2029. Under certain conditions a W-8BEN can remain valid indefinitely until circumstances change.¹² You must collect a new form immediately if a change in circumstances makes anything on the existing form incorrect, such as the payee moving countries or changing entity classification. Keep the forms as long as they may be relevant to your withholding liability.¹³

Separate Regimes You Might Confuse With FDAP

Publication 515 also touches three other withholding systems that a payer can run into. They aren’t the FDAP 30% rules, and treating them as if they were will produce the wrong answer.

FIRPTA on U.S. Real Property Sales

When a foreign person sells a U.S. real property interest, the buyer withholds 15% of the amount realized — not just the seller’s profit — under the Foreign Investment in Real Property Tax Act. Amount realized includes cash paid, the fair market value of any other property transferred, and any liabilities the buyer assumes. If the buyer doesn’t withhold, the IRS can collect from the buyer.¹⁴ A sale of U.S. real estate by a foreign seller follows FIRPTA, not the 30% FDAP rate.

Chapter 4 (FATCA)

The Foreign Account Tax Compliance Act sits on top of the FDAP rules as a second layer under Chapter 4. FATCA requires 30% withholding on “withholdable payments” made to certain foreign entities that fail to document their status or identify their U.S. owners.¹⁵ Withholdable payments include U.S.-source FDAP income and, for dispositions after 2018, gross proceeds from selling property that can produce U.S.-source interest or dividends.¹⁶

Two categories of payees carry the risk. Foreign financial institutions are subject to Chapter 4 withholding unless you can treat them as participating, deemed-compliant, or exempt beneficial owners. Passive non-financial foreign entities are subject to withholding if they don’t identify their substantial U.S. owners or certify they have none. A coordination rule prevents double withholding: a payment already subject to Chapter 4 isn’t also hit under Chapter 3. Chapter 4 withholding cannot be reduced by treaty.¹⁵

Partnerships With Foreign Partners

Partnerships earning income effectively connected with a U.S. trade or business withhold on each foreign partner’s allocable share of that ECI at the highest marginal rate for that partner type: 37% for non-corporate foreign partners, 21% for corporate foreign partners. The obligation applies to domestic and foreign partnerships alike, and the rate applies to the allocable share of effectively connected taxable income, not the gross payment.¹⁷

Depositing What You Withhold

Chapter 3 deposit schedules work on a quarter-monthly cycle and depend on how much undeposited tax you’re holding. Quarter-monthly periods end on the 7th, 15th, 22nd, and last day of each month.¹⁸

$2,000 or more at the end of a quarter-monthly period: deposit within 3 business days.
$200 to $1,999 at the end of a month: deposit within 15 days after month-end.
Less than $200 at year-end: deposit by March 15 of the following year, or pay it with Form 1042.

All deposits are made electronically. Late-deposit penalties start at 2% and climb to 15% once the IRS has issued a notice demanding payment.¹⁹

Annual Reporting: Forms 1042 and 1042-S

Two forms close out the year, both due March 15.

Form 1042-S reports the U.S.-source income paid to each foreign recipient and the tax withheld. Prepare a separate 1042-S for each recipient and each income type. A copy goes to the recipient; a copy is filed electronically with the IRS. The foreign recipient uses it to claim credit for the withheld tax on their own U.S. return.²⁰

Form 1042 is the annual withholding tax return. It reconciles total FDAP income paid, total tax withheld, and total deposits. Total deposits should match total liability. Any remaining balance under $200 from December can be paid with the return.¹⁸

Penalties

Late deposits are penalized in tiers based on how many days late they land:

1 to 5 calendar days late: 2% of the unpaid deposit.
6 to 15 days late: 5%.
More than 15 days late: 10%.
After IRS notice demanding payment: 15%.¹⁹

Filing Form 1042-S late or incorrectly triggers a separate per-form penalty. For returns due in 2026:²¹

Filed correctly within 30 days of the deadline: $60 per form (maximum $698,500 per year; $244,500 for small businesses).
Filed correctly after 30 days but by August 1: $130 per form (maximum $2,095,500; $698,500 for small businesses).
Filed after August 1 or not filed at all: $340 per form (maximum $4,191,500; $1,397,000 for small businesses).
Intentional disregard: greater of $690 per form or 10% of the amounts required to be reported, no cap.

A small business for this purpose has average annual gross receipts of $5 million or less over the three most recent tax years.²⁰

Personal liability is the sharpest tool. The trust fund recovery penalty can be assessed against any individual responsible for collecting and paying the withheld tax who willfully failed to do so. Responsibility reaches corporate officers, partners, sole proprietors, and any employee or agent with authority over business funds. The penalty is 100% of the unpaid withholding tax plus interest.³

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Internal Revenue Service. About Publication 515 – Withholding of Tax on Nonresident Aliens and Foreign Entities
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Office of the Law Revision Counsel. 26 USC 1441 – Withholding of Tax on Nonresident Aliens
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Internal Revenue Service. Trust Fund Recovery Penalty
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Internal Revenue Service. Fixed, Determinable, Annual, or Periodical (FDAP) Income
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Internal Revenue Service. Withholding on Specific Income
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Office of the Law Revision Counsel. 26 US Code 871 – Tax on Nonresident Alien Individuals
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Office of the Law Revision Counsel. 26 USC 881 – Tax on Income of Foreign Corporations Not Connected With United States Business
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Internal Revenue Service. Table 4 – Limitation on Benefits
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Internal Revenue Service. Instructions for Form W-8ECI
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Internal Revenue Service. Form W-8ECI – Certificate of Foreign Persons Claim That Income Is Effectively Connected With the Conduct of a Trade or Business in the United States
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Internal Revenue Service. Form W-8IMY
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Internal Revenue Service. Instructions for Form W-8BEN
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Internal Revenue Service. Instructions for the Requester of Forms W-8BEN, W-8BEN-E, W-8ECI, W-8EXP, and W-8IMY
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Internal Revenue Service. FIRPTA Withholding
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Internal Revenue Service. Tax Withholding Types
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eCFR. 26 CFR 1.1473-1 – Section 1473 Definitions
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Internal Revenue Service. Partnership Withholding
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Internal Revenue Service. Instructions for Form 1042
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Internal Revenue Service. Failure to Deposit Penalty
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Internal Revenue Service. Instructions for Form 1042-S
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Internal Revenue Service. Information Return Penalties