Form 1042-S (2025 Guide for US Expats)

Updated on April 21, 2026

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Form 1042-S is a US tax form that reports US-source income paid to foreign persons and the tax withheld on that income.

If you’re a US expat, you may receive Form 1042-S if your income was treated as subject to nonresident (Chapter 3) withholding, even if you are a US citizen.

This typically happens when the withholding agent classifies your income as foreign-person income, often because of documentation on file (such as a Form W-8) or because the payment was processed.

In other words, Form 1042-S is issued based on how your income is classified, not simply your citizenship.

Quick facts about Form 1042-S (2025 tax year)

Before going deeper, here’s the short version most people are actually looking for:

Topic	Answer
Who issues it	Withholding agents (banks, universities, companies)
Who receives it	Foreign persons and some US expats with specific income types
Deadline (2026)	March 15, 2026
Standard withholding rate	30% (can be reduced by tax treaties)
Filed with	IRS (Form 1042 summary)
Used for	Reporting income + withholding

This table alone answers most search queries. The rest of this guide fills in the gaps.

Why did I receive Form 1042-S as a US expat?

You receive Form 1042-S when income is subject to nonresident withholding rules, even if your situation doesn’t feel “foreign.”

Common scenarios include:

You earned US-source income while living abroad
You received scholarships or grants from a US institution
You hold US investments (dividends, interest, royalties)
Your income was processed through a withholding agent using W-8 documentation, which may indicate a misclassification or error for a US person

So even US citizens abroad can sometimes get caught in this reporting system, depending on how payments are structured.

Note: The form is tied to how the income is classified, not just your citizenship.

What types of income are reported on Form 1042-S?

Form 1042-S reports what the IRS calls FDAP income (fixed, determinable, annual, or periodical income).

That includes:

Dividends from US stocks
Interest income
Royalties
Rental income
Scholarship or fellowship income
Certain service payments

Each type is assigned an income code, which determines how it’s taxed and reported.

Note: Rental income is only reported on Form 1042-S if it is treated as FDAP income (gross, not effectively connected income). If treated as ECI, it would not be reported this way.

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How withholding works on Form 1042-S

In simple terms, the payer withholds tax before you even receive the money.

Withholding is generally calculated by applying a rate to income, but the exact amount depends on the type of income, treaty rules, and classification (e.g., FDAP vs. ECI).

Default rule

30% withholding applies to most US-source income paid to foreign persons

Reduced rates

May apply if:
- A tax treaty exists
- You submitted a valid Form W-8BEN

Scenario	Withholding Rate
No treaty, no documentation	30%
Treaty applied	0%–15% (varies by country and income type)
Incorrect/missing forms	Default 30%

A small mistake here, such as missing paperwork, can lead to overpaying taxes upfront.

What should you do if you receive Form 1042-S?

You should review the form carefully, confirm the withholding is correct, and include the income on your US tax return, or request a correction if it was issued in error.

At first glance, it might look like just another document. However, it plays a direct role in how your income and taxes are reported.

To make sure nothing is missed, here’s a simple way to work through it:

Step-by-step:

Check the income type
Look at the income code

Verify the withholding amount
Was the 30% default rate applied, and is it correct based on treaty benefits or documentation?

Confirm treaty benefits
Were the reduced rates applied properly?

Report it on your tax return
Include the income in your US filing

Claim a refund if needed
If too much tax was withheld

Do you need to report Form 1042-S on your US tax return?

Yes. If you’re a US citizen, the income shown on Form 1042-S still needs to be reported on your return.

However, the withholding shown on the form can:

Offset your tax liability
Be claimed as a credit
Result in a refund

This is where things get slightly counterintuitive.

Even though the form is designed for foreign persons, US citizens still need to integrate it into standard reporting.

Form 1042-S versus Form 1099: what’s the difference?

Short answer: Both report income, but they apply to different tax classifications.

Feature	Form 1042-S	Form 1099
Who receives it	Foreign persons; US persons (e.g., W-8 on file or misclassified).	US taxpayers
Withholding	Often, 30% default	Usually, none or backup withholding
Treaty application	Yes	No
Filing system	Form 1042	Standard IRS reporting

Note: If you’re a US expat, you might receive both forms depending on how your income is structured.

Common mistakes to avoid

Some of these are easy to miss, especially if you’re not expecting this form.

Ignoring the form entirely
Not claiming excess withholding
Missing treaty benefits
Assuming it replaces Form 1099
Reporting income incorrectly

A surprising number of expats either overpay or underreport simply because they don’t recognize what this form represents.

Filing deadlines and timing (2026)

Here’s what to keep in mind:

Filing requirement	Deadline
Form 1042-S issued to the recipient	March 15, 2026
Filed with IRS	March 15, 2026

That’s earlier than most US tax deadlines, which can catch people off guard.

Why Form 1042-S matters more than you think

Form 1042-S matters because it shows how much tax was already withheld on your income and whether you may be due a refund. It directly affects how you report income and calculate your final tax position.

At first glance, it looks like just another reporting form.

But in practice, it affects: