Form 1042-S, Box by Box: What It Says About Your Dividend Tax
Every March, brokers send foreign investors in US stocks a Form 1042-S, and most of those forms go straight into a drawer, unread. That is a missed check. Read your 1042-S box by box and it tells you exactly what the IRS has on file about your US dividends: how much you were paid, what tax rate was applied, and how much was actually withheld. If your treaty rate never made it onto the form, this is where you find out, and this is the document that gets your money back.
This guide walks through the form from a reader’s perspective: what it is, when it should arrive, which boxes matter, how to tell whether your rate is right, and what to do when something is wrong.
What Form 1042-S is
Form 1042-S, officially titled “Foreign Person’s U.S. Source Income Subject to Withholding,” is an information return, not a tax return you file. Your broker (the “withholding agent,” in IRS language) files it with the IRS to report the US-source income paid to you during the year and the tax withheld from it. You receive Copies B, C, and D, and the instructions require that those copies match what the IRS received. In other words, this form is the IRS’s own record of your dividend income, and you are holding a copy of it.
Two quick clarifications. First, Form 1042 and Form 1042-S are different things: the 1042 is your broker’s annual summary return covering all recipients, while each 1042-S is your individual statement. Second, your broker’s version may not look like the IRS’s blank template. Brokers are allowed to issue substitute forms with their own layout, as long as the required boxes and data are there.
One more source of confusion: the year printed on the form. The form you receive in March 2026 covers tax year 2025 and says “2025” at the top. The blank form you can download from irs.gov today is the 2026 edition, which brokers will use for 2027. Different years, both correct.
The reason this form exists at all is the default rule: most US-source income paid to a foreign person is taxed at 30%, unless a tax treaty between your country of residence and the US sets a lower rate. The 1042-S shows which of those two numbers actually got applied to your money.
When and why you get it
Brokers must furnish Form 1042-S to recipients by March 15 of the following calendar year. When the 15th falls on a weekend or legal holiday, the deadline moves to the next business day. For tax year 2025 forms, March 15, 2026 is a Sunday, so the real deadline is Monday, March 16, 2026. If the second half of March arrives and you have no form, that is a broker problem to raise, not a form you can request from the IRS.
You get a 1042-S because you received US-source income as a non-US person: dividends from US stocks, in the typical case. Unlike the 1099 family that US taxpayers receive, the 1042-S has no minimum dollar threshold; even a small dividend triggers it.
Now the part most guides get wrong at the top: receiving a 1042-S does not, by itself, mean you must file a US tax return. If the correct treaty rate was applied and the right amount was withheld, the form is a record to archive, and you are done. You need to act only when something on it is off: you were withheld 30% despite a lower treaty rate, you are due a refund, or the form itself was issued to the wrong kind of taxpayer. The rest of this guide is about checking which situation you are in.
The boxes that matter
Most of the boxes on a 1042-S exist for your broker’s reporting, not for you. Eight boxes carry what a dividend investor needs.
- Box 1, Income code. A two-digit code for the income type. Code 06 is dividends, and it is what most readers will see. A handful of sibling codes cover dividend-like payments:
| Code | What it covers |
|---|---|
| 06 | Dividends paid by U.S. corporations, general |
| 07 | Dividends qualifying for the direct dividend rate |
| 08 | Dividends paid by foreign corporations |
| 34 | Substitute payment, dividends (securities lending) |
| 36 | Capital gains distributions |
| 37 | Return of capital |
- Box 2, Gross income. Your total US-source income for the year, in whole dollars, including the tax that was withheld. If you reconcile against your broker statements, the difference between this number and what landed in your account is the withholding.
- Box 3, Chapter indicator. A “3” means chapter 3 withholding, the standard nonresident regime almost every reader falls under. A “4” relates to FATCA reporting.
- Box 3a, Exemption code. Code 04 means your withholding was reduced or exempted under a tax treaty. This is the box that confirms your W-8BEN did its job.
- Box 3b, Tax rate. The correct withholding rate that applies to the income, and the single most important box on the form. The next section is built around it.
- Box 7a, Federal tax withheld. The dollar amount of US federal tax actually withheld. Note the units: this is an amount, not a rate. Published guides have been caught labeling Box 7a as “the rate that was applied” and Box 7b as the withheld amount; in reality 7a is the money, 7b is a checkbox about escrow procedures, and the rate lives in 3b. If you remember one thing from this article, make it that.
- Box 10, Total withholding credit. The combined credit from Boxes 7a, 8, and 9: the total amount available to be credited to you. For a simple dividend account, it usually equals Box 7a.
- Box 13b, Country code. Your country of tax residence. It pairs with Box 3a: the instructions state that exemption code 04 should only appear with a country that has an income tax treaty with the US.
Is your tax rate right?
Here is the check almost nobody runs, and it takes about a minute.
Box 3b is not just a record of what your broker did. The instructions tell the filer to enter “the correct rate of withholding that applies to the income,” and that the correct rate should be included even if the filer withheld at a different rate. Box 3b is the rate that should apply to you, stated on an IRS-filed document.
So run three checks:
- Box 3b against your treaty rate. Look up your country’s dividend withholding rate in our treaty rate table. If your rate is 15% and Box 3b says 30.00, the form is telling you the treaty was not applied. The usual cause is a W-8BEN that was never filed or has expired.
- Box 3a shows code 04. Treaty treatment shows up here. A treaty rate in 3b without 04 in 3a, or the reverse, is worth a question to your broker.
- The math on what was actually taken. Divide Box 7a by Box 2 and multiply by 100. That is your effective withholding rate. It should roughly match Box 3b. If 3b says 15% but your math says 30%, you overpaid and the difference is refundable.
A concrete example: a Singapore-resident investor (no US treaty, 30% statutory rate) should see 30.00 in Box 3b. A UK investor should see 15.00. A Hong Kong investor, like the Singapore investor, sits at 30% because Hong Kong has no US income tax treaty. If your form contradicts your country, treat that as a finding, not a formality.
One benign case before you read a mismatch as an error: a single year can bring more than one Form 1042-S, and each form carries its own rate. A dividend line at your treaty rate can sit next to a code 37 return of capital at 0%. Check each form on its own; do not average across them.
If something is wrong
Two paths, in order of effort.
Path one: ask your broker for a corrected form. Brokers can and do issue corrected 1042-S forms, and once the original has been filed with the IRS they do it through an “Amended” form with an amendment number. Ask before filing season if you can. What makes this path powerful is where the penalties land: the fines for late, incorrect, or unfiled 1042-S forms fall on the withholding agent, not on you. For tax year 2025 those run from $60 per form up to $340, and intentional disregard jumps to the greater of $690 or 10% of the reported amount, with no cap. None of that is your liability, but all of it is your leverage. A broker facing penalty exposure has every reason to fix your form.
Path two: claim the refund yourself on Form 1040-NR. If the broker cannot or will not correct the form, the over-withheld tax is still recoverable by filing a US nonresident return, with your 1042-S as the evidence attached. Filing a 1040-NR requires a US taxpayer identification number, which most foreign investors do not have and do not otherwise need; the ITIN guide covers who actually needs one and the application path.
One warning in the other direction: if you are a US taxpayer who received a 1042-S by mistake, that is also a misclassification to fix with your broker, because the form means the broker thinks you are a foreign person.
Common questions
I received a 1042-S. Do I have to file a US tax return?
Not necessarily. If the correct treaty rate was applied and the withholding matches, archive the form and you are done. Filing a 1040-NR matters when you are owed a refund (over-withholding), when you have effectively connected income, or in a handful of other situations. The form is evidence, not a summons.
When should I receive my 1042-S?
By March 15 of the year after the income was paid, extended to the next business day when the 15th falls on a weekend or holiday. For tax year 2025 forms, that means March 16, 2026. If April is close and nothing has arrived, contact your broker; the form comes from them, not from the IRS.
Why did I get a 1099 instead of a 1042-S?
Because your broker thinks you are a US taxpayer. The 1099 family is for US persons; the 1042-S is for foreign persons, with no minimum dollar threshold. A non-US investor who receives a 1099 has been misclassified, and the fix is to file a W-8BEN with the broker so future income is reported correctly and taxed at the right rate.
Box 3b shows 30% but my treaty rate is 15%. What now?
The treaty was not applied, most often because a W-8BEN was never filed or lapsed. Refile the W-8BEN with your broker, then ask for a corrected 1042-S for the affected years. If the broker will not correct it, the over-withheld amount is recoverable through a 1040-NR, using the incorrect form itself as evidence.
Do Form 1042-S penalties apply to me?
No. The penalties for late, missing, or incorrect 1042-S forms apply to the withholding agent that files them, meaning your broker, not to recipients. Their existence works in your favor: it is why brokers have a process for issuing corrected forms.
This guide is maintained by the DivAtlas team and checked against IRS sources before every update. About our verification process.
Last verified: September 15, 2026, against the 2025 Instructions for Form 1042-S. Educational content, not tax advice.