If you have a U.S. work permit, yes, you have to pay federal income tax on what you earn here. The IRS does not care about your immigration status or which category of work authorization you hold. What it does care about is how many days you have been physically present in the country, because that determines whether you are taxed as a resident alien or a nonresident alien, and that classification changes almost everything else about your return.
Resident or Nonresident: The Test That Sets Your Tax Bill
The IRS sorts foreign workers into two groups using the Substantial Presence Test. You are treated as a resident alien for tax purposes if both conditions are met:1eCFR. 26 CFR 301.7701(b)-1 – Resident Alien
- You were physically present in the U.S. for at least 31 days during the current calendar year.
- Your weighted day total across a three-year window reaches at least 183.
The weighting works like this: each day in the current year counts as one full day, each day in the prior year counts as one-third of a day, and each day two years back counts as one-sixth. Someone present 120 days each year for three years ends up at 180 and does not meet the test. Someone at 130 days each year lands at 195 and does.
Meeting the test puts you in the same tax position as a U.S. citizen. You report worldwide income (wages, investment earnings, rental income, anything from anywhere) on Form 1040, and the same deductions and credits are available to you.2Internal Revenue Service. Alien Taxation – Certain Essential Concepts3Internal Revenue Service. U.S. Residents
If you do not meet the test, you are a nonresident alien. You are taxed only on U.S.-source income and file Form 1040-NR.4Internal Revenue Service. Taxation of Nonresident Aliens5Internal Revenue Service. About Form 1040-NR, U.S. Nonresident Alien Income Tax Return Income earned outside the U.S. is not taxed here.
When Your Days Don’t Count
Some visa holders are treated as “exempt individuals,” which does not mean they pay no tax. It means their U.S. days do not count toward the 183-day total. The category covers foreign government officials on A or G visas, teachers and trainees on J or Q visas, students on F, J, M, or Q visas, and professional athletes competing in charitable events.6Internal Revenue Service. Substantial Presence Test Students can exclude days for up to five calendar years, and teachers or trainees for up to two. Once that window closes, days begin counting normally, and residency can flip.
Social Security and Medicare: Who Pays FICA
Most work permit holders pay FICA taxes on the same terms as any U.S. worker: 6.2% for Social Security and 1.45% for Medicare, with the employer matching. Workers on H-1B, TN, O-1, E-3, and similar employment-based visas pay from the first paycheck. There is no exemption for them.
The carveout is narrower than people often assume. Foreign students and exchange visitors on F-1, J-1, or M-1 visas are exempt from FICA only while they remain classified as nonresident aliens, and only for work that USCIS has authorized in connection with the purpose of the visa.7Internal Revenue Service. Foreign Student Liability for Social Security and Medicare Taxes Students usually stay nonresident for their first five calendar years; J-1 teachers and researchers, typically the first two. After that, FICA withholding starts.
If an employer withholds FICA in error, ask them to refund it first. If they cannot, file Form 843 with the IRS, attaching your W-2, a copy of your visa stamp, and Form I-94.8Internal Revenue Service. Social Security Tax/Medicare Tax and Self-Employment
The Paperwork You Actually Need
Every return requires a Taxpayer Identification Number. Most work permit holders use the Social Security Number issued alongside their work authorization. If you are not eligible for an SSN, apply for an Individual Taxpayer Identification Number by filing Form W-7 with your return, along with a certified copy of your passport.9Internal Revenue Service. About Form W-7, Application for IRS Individual Taxpayer Identification Number
Your employer sends a Form W-2 by the end of January showing your wages and the tax withheld.10Internal Revenue Service. About Form W-2, Wage and Tax Statement If you did freelance or contract work, expect a Form 1099-MISC or 1099-NEC from anyone who paid you $600 or more.11Internal Revenue Service. About Form 1099-MISC, Miscellaneous Information The name and identifying number on every document need to match your government records exactly. Mismatches cause delays and rejected returns.
The W-4 Rule Nonresident Aliens Get Wrong
Nonresident aliens fill out Form W-4 differently than everyone else. Regardless of your actual marital status, check “Single or Married filing separately.” Do not account for a spouse’s income, because nonresident aliens generally cannot file jointly. Write “Nonresident Alien” or “NRA” below Step 4(c). That notation signals your employer to withhold extra, which compensates for the fact that nonresident aliens generally cannot claim the standard deduction.12Internal Revenue Service. Supplemental Form W-4 Instructions for Nonresident Aliens
If a tax treaty exempts your wages from withholding, skip the W-4 and file Form 8233 instead.
Tax Treaties: When Your Home Country Reduces the Bill
The United States has income tax treaties with dozens of countries, and they can reduce or eliminate U.S. tax on certain kinds of income.13Internal Revenue Service. United States Income Tax Treaties – A to Z Benefits vary widely. Some treaties exempt student wages up to a dollar threshold, some reduce rates on investment income, some cover specific categories of workers for a limited period. Whether you qualify depends on your country’s treaty and the specific article that applies to you.
Claim treaty benefits by filing Form 8833 with your return, naming the exact treaty provision you are relying on. Skipping this form can trigger a $1,000 penalty per failure.14Internal Revenue Service. Form 8833 – Treaty-Based Return Position Disclosure Under Section 6114 or 7701(b)
One trap: most U.S. treaties contain a “saving clause” that lets the U.S. tax its own residents as if the treaty did not exist. If you have become a resident alien through the Substantial Presence Test, the saving clause can wipe out the benefit you were counting on.15Internal Revenue Service. Tax Treaties Can Affect Your Income Tax Many treaties carve out exceptions to the saving clause, especially for students and trainees, so the benefit may still survive. Read the article you are claiming, not just the summary.
Deadlines, Extensions, and What Happens If You’re Late
For tax year 2025, the filing deadline is April 15, 2026. That is when your return must be filed and when any tax owed must be paid.16Internal Revenue Service. Need More Time to File? Don’t Wait, Request an Extension Filing Form 4868 gives you an automatic extension to October 15, 2026, but only for filing. It does not extend your payment deadline. Anything unpaid after April 15 accrues interest and penalties.
If you are self-employed or have income without withholding, you may owe quarterly estimated tax payments. The IRS requires estimated payments if you expect to owe $1,000 or more at filing. Nonresident aliens use Form 1040-ES(NR).17Internal Revenue Service. Estimated Taxes Missing quarterly deadlines creates its own penalties.
The IRS has two separate late penalties, and the one for not filing is far steeper than the one for not paying. The failure-to-file penalty is 5% of the unpaid tax per month, capped at 25%.18Internal Revenue Service. Failure to File Penalty The failure-to-pay penalty is 0.5% per month, also capped at 25%.19Internal Revenue Service. Failure to Pay Penalty Interest runs on top of both.
If you cannot afford your full tax bill by April 15, file anyway. Filing on time and paying late costs 0.5% per month. Not filing and not paying costs 5.5% per month. On a $5,000 balance, that is $25 per month against $275 per month in penalties.
State Tax Is a Separate Obligation
Federal tax is not the end of it. Most states impose their own income tax, and state residency rules often differ from the federal Substantial Presence Test. Some states look at whether you maintain a home there; others count workdays inside their borders. State returns have their own forms and their own deadlines. Even if a treaty zeroes out your federal tax, the state may still require a return.
Before You Leave the Country: The Sailing Permit
Foreign nationals planning to leave the U.S. are generally required to obtain a “sailing permit,” also called a departure clearance, from the IRS before going. This document shows you have settled your U.S. tax obligations. You file either Form 1040-C or Form 2063 in person at an IRS Taxpayer Assistance Center, by appointment.20Internal Revenue Service. Topic No. 858, Alien Tax Clearance
Form 2063 is the shorter option, available if you had no taxable income during the current or preceding tax year, or if you are a resident alien whose departure will not hinder tax collection. Everyone else files Form 1040-C, which works like an early tax return. Any tax it shows as due must be paid before your clearance is issued. Apply no earlier than 30 days before departure, and give yourself at least two weeks, because appointment slots can be limited.21Internal Revenue Service. Departing Alien Clearance (Sailing Permit) Certain categories, including some students with limited U.S. income and short-term business visitors, are exempt. Check the exemption list on the IRS departing alien page before you book.