Is a W-9 Only for U.S. Citizens? Residency Tests and W-8BEN

No, a W-9 is not only for U.S. citizens. The form is for any “U.S. person” as federal tax law defines that term, and the definition covers resident aliens alongside citizens. If you hold a green card, or you’ve spent enough time in the United States to meet the substantial presence test, you’re a U.S. person for tax purposes and should give a payer Form W-9 when they ask for your taxpayer identification number. Your country of citizenship isn’t the deciding factor. Your tax residency is.

Who Counts as a U.S. Person

Under 26 U.S.C. § 7701(a)(30), a U.S. person includes U.S. citizens (including those living abroad), resident aliens who pass either the green card test or the substantial presence test, domestic partnerships and corporations, and most estates and certain domestic trusts.¹ The Form W-9 instructions repeat this, describing a U.S. person as “an individual who is a U.S. citizen or U.S. resident alien” along with domestic entities.²

Signing the W-9 is a certification under penalty of perjury that you are a U.S. person, that the TIN you provided is correct, that you are not subject to backup withholding, and that any FATCA exemption code entered is accurate.² So the question of whether you should sign one comes down to whether you fit the resident category.

The Green Card Test

If U.S. Citizenship and Immigration Services has granted you lawful permanent resident status at any point in the calendar year, you are a resident alien for tax purposes. Your tax residency begins on the first day you’re physically present in the country as a permanent resident.³ Green card in hand means W-9, not W-8BEN.

The Substantial Presence Test

Even without a green card, you can be a resident alien if you’ve been physically present in the U.S. long enough. You meet the substantial presence test if you were in the country at least 31 days during the current year and your weighted three-year total reaches at least 183 days. The formula counts every day in the current year, one-third of your days from the prior year, and one-sixth of your days from two years ago.³

The weighting matters. Someone who spent 120 days in the U.S. each year for three years lands at 120 + 40 + 20 = 180 days, still a nonresident. Push that to 125 days each year and the total is 125 + 42 + 21 = 188, crossing the threshold. That person is now a resident alien and should file a W-9 when asked.

When Your Days Don’t Count

Certain visa holders are treated as “exempt individuals,” meaning their days in the U.S. don’t count toward the substantial presence test. This is where students and visiting scholars get tripped up.

Students on F, J, M, or Q visas can exclude their days for up to five calendar years.⁴ Teachers and trainees on J or Q visas who aren’t classified as students can exclude their days for up to two calendar years, with a possible extension to four years under certain conditions.⁵

A graduate student in her fourth year on an F-1 visa isn’t counting any of those days, remains a nonresident alien, and should give payers Form W-8BEN instead of a W-9. In her sixth calendar year, the exemption is gone. Days start counting normally, and if she meets the 31-day and 183-day thresholds, she becomes a resident alien and switches to a W-9.

The Closer Connection Exception

You can meet the substantial presence test and still avoid resident alien status if you show a closer connection to a foreign country. All of the following must be true:

You were present in the U.S. fewer than 183 days during the year.
You maintained a tax home in a foreign country for the entire year.
Your home, family, belongings, bank accounts, social ties, and business activities are more connected to that foreign country than to the U.S.
You did not apply for, and do not have a pending application for, lawful permanent resident status.

You claim the exception by filing Form 8840. Skip that filing and the IRS will treat you as a resident alien unless you can show by clear and convincing evidence that you took reasonable steps to comply.⁶ If the exception applies, you’d hand payers a W-8BEN.

When a Non-Citizen Uses W-8BEN Instead

If you don’t pass the green card test or the substantial presence test, or you successfully claim the closer connection exception, you’re a nonresident alien. Don’t fill out a W-9. Give the payer Form W-8BEN, which establishes your foreign status for withholding purposes.⁷

The default withholding rate for nonresident aliens is 30%. Tax treaties between the U.S. and many countries can reduce that rate, sometimes to zero for income like scholarships, royalties, or certain dividends. To claim a treaty benefit on the W-8BEN, you identify your country of residence on line 9 and the specific treaty article and reduced rate on line 10. Some treaty benefits also require an Individual Taxpayer Identification Number.⁸

What Happens If You Use the Wrong Form

The direction of the mistake matters. A resident alien who submits a W-8BEN by mistake will be treated as a foreign person, and the payer will withhold 30%. You’d file a return and wait for a refund. The W-8BEN instructions state directly that resident aliens must not use the form and should provide a W-9 instead.⁹

The other direction is more serious. A nonresident alien who signs a W-9 has falsely certified under penalty of perjury that they are a U.S. person.²

Status can also change mid-year. If you receive a green card in June, or your student exemption runs out and your day-count pushes you into resident status, you must notify each withholding agent within 30 days of becoming a resident alien and submit a W-9 to replace any W-8BEN on file.⁹

Penalties for False Certification

Willfully providing false information on a W-9 is a felony. Because the form is signed under penalty of perjury, entering a fake TIN or falsely certifying U.S. person status can violate 26 U.S.C. § 7206. A conviction carries a fine of up to $100,000 and up to three years in prison.¹⁰¹¹¹²

The safe path is the accurate one. Work out your residency status first, choose the form that matches, and if your status shifts partway through the year, update the payer within the 30-day window.

1
Office of the Law Revision Counsel. 26 USC 7701 – Definitions
2
Internal Revenue Service. Form W-9 (Rev. March 2024) – Request for Taxpayer Identification Number and Certification
3
Internal Revenue Service. U.S. Tax Residency – Green Card Test
4
Internal Revenue Service. Exempt Individual – Who Is a Student
5
Internal Revenue Service. Taxation of Alien Individuals by Immigration Status – J-1
6
Internal Revenue Service. Closer Connection Exception to the Substantial Presence Test
7
Internal Revenue Service. Form W-8BEN (Rev. October 2021) – Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting
8
Internal Revenue Service. Instructions for Form W-8BEN (Rev. October 2021)
9
Internal Revenue Service. Instructions for Form W-8BEN (10/2021)
10
Office of the Law Revision Counsel. 26 USC 7206 – Fraud and False Statements
11
Office of the Law Revision Counsel. 26 USC 6723 – Failure to Comply With Other Information Reporting Requirements
12
Internal Revenue Service. Backup Withholding