US Taxes and Foreign Workers: A Deep Dive Directed Towards Talent from Abroad

If you have moved to the United States for work, understanding how the tax system applies to you is essential. Your tax classification decides how much of your income the IRS can tax and which forms you need to file. This guide covers the key concepts that foreign talent should know.

Foreign Workers and U.S. Taxes

How the United States taxes you comes down to one question: are you a resident or nonresident for tax purposes? Resident aliens pay taxes on their worldwide income, just like U.S. citizens, while nonresident aliens generally only owe taxes on U.S.-source income. Getting this classification wrong can lead to overpaying, underpaying, or filing the wrong forms.

Nonresident Alien vs. Resident Alien

The IRS places every non-citizen into one of two categories: nonresident alien or resident alien. According to the IRS guidelines on determining alien tax status, a nonresident alien has not received a Green Card and has not passed the Substantial Presence Test. A resident alien either holds a Green Card or meets the Substantial Presence Test.

Resident aliens must report all income from anywhere in the world and file using Form 1040. They qualify for the standard deduction and most tax credits. Nonresident aliens are only taxed on U.S.-source income, file using Form 1040-NR, and generally cannot claim the standard deduction. Keep in mind that your immigration visa does not automatically determine your tax status. Many visa holders become resident aliens for tax purposes well before they receive permanent residency.

The Substantial Presence Test

The Substantial Presence Test is the formula the IRS uses to decide whether someone without a Green Card has spent enough time in the country to be taxed as a resident. It looks at your physical presence over a three-year period. You meet the test if your weighted total reaches 183 days or more.

The calculation works like this: count all the days you were in the U.S. during the current year, then add one-third of the days from the previous year, and one-sixth of the days from the year before that. For example, if you spent 120 days in the U.S. in each of the last three years, your total would be 120 + 40 + 20 = 180 days, so you would not meet the test. But if your current-year days were slightly higher, you could cross the 183-day threshold and become a resident alien for tax purposes.

Certain visa holders are exempt from counting days for a set number of years. Students on F or J visas are exempt for up to five years, and teachers or researchers for two years. If you believe you have a stronger connection to your home country, you may also file Form 8840 to claim the “closer connection” exception and remain classified as a nonresident.

Dual-Status Taxpayers

A dual-status taxpayer holds both nonresident and resident alien status within the same calendar year. This most commonly happens in the year you arrive in or leave the U.S. For example, if you entered on a work visa in June and stayed through December, you would likely be a nonresident from January through May and a resident from June onward.

During your resident period, the IRS taxes your worldwide income at the standard graduated rates, just as it would for a citizen. During your nonresident period, only U.S.-source income is taxable. This split can actually work in your favor if you earned significant income abroad before arriving. However, dual-status filing comes with restrictions: you cannot take the standard deduction, you cannot e-file, and you generally cannot file a joint return unless your spouse is a U.S. citizen or resident alien. Your main form depends on your status at year-end. If you are a resident on December 31, you file Form 1040 and attach Form 1040-NR as a supporting statement, writing “Dual-Status Return” at the top.

Do Foreign Workers Have to Pay U.S. Taxes?

Yes, in most cases foreign workers are required to pay some form of U.S. tax. The exact scope depends on whether you are a resident alien or nonresident alien. Both groups have obligations, but the rules around taxable income and available deductions are quite different.

Tax Obligations for Resident Aliens

If the IRS considers you a resident alien, your obligations are essentially the same as a U.S. citizen’s. You must report total income from all sources worldwide, including your U.S. salary, freelance work, rental income, investment returns, and business profits from any country. You file using Form 1040 and are subject to the same progressive tax brackets.

A key advantage is access to the standard deduction ($15,750 for single filers in 2025, as updated by the One, Big, Beautiful Bill Act signed on July 4, 2025) and tax credits like education credits and the earned income credit. If you paid taxes to another country on the same income, you can use the foreign tax credit (Form 1116) to avoid double taxation. Resident aliens also have reporting requirements for foreign financial accounts: if your overseas accounts exceed certain thresholds, you may need to file an FBAR (FinCEN Form 114) or a FATCA report (Form 8938).

Tax Obligations for Nonresident Aliens

Nonresident aliens only need to report and pay taxes on income connected to the United States, such as wages from a U.S. employer, U.S. business income, or U.S. investment returns. Income earned entirely outside the country is generally not taxable by the IRS.

You file using Form 1040-NR and cannot claim the standard deduction. You may only itemize deductions directly connected to your U.S. income. U.S.-source investment income (interest, dividends, certain capital gains) is typically taxed at a flat 30%, unless a tax treaty provides a lower rate. Nonresident aliens on F, J, M, or Q visas may also be exempt from Social Security and Medicare taxes for a set period, resulting in higher take-home pay during the early years.

Which Types of Income Are Taxable?

The types of income subject to U.S. tax depend on your status. The table below summarizes the most common categories.

For nonresident aliens, the IRS splits U.S.-source income into two categories: “effectively connected income” (ECI), which is tied to a U.S. trade or business and taxed at graduated rates, and “FDAP income” (fixed, determinable, annual, or periodic income), which includes passive items like interest and dividends and is taxed at the flat 30% rate.

U.S. Federal Income Tax Rates and Brackets

The United States uses a progressive tax system, meaning you pay a higher rate only on the portion of your income that falls into a higher bracket, not on your entire earnings. According to the IRS, for 2025 there are seven federal tax rates ranging from 10% to 37%.

Standard Tax Brackets That Apply to Resident Aliens

Resident aliens follow the same graduated brackets as U.S. citizens. Each portion of taxable income is taxed at the rate for that bracket, meaning your effective tax rate is always lower than your highest bracket. Below are the 2025 brackets for single filers.

As an example, if you earn $60,000 in taxable income, you would pay 10% on the first $11,925, then 12% on the next portion up to $48,475, and 22% on the rest. Your total tax bill would be roughly $8,114, giving you an effective rate of about 13.5%.

The 30% Flat Withholding Rate for Nonresident Aliens

For passive income (FDAP income), the default tax rate for nonresident aliens is a flat 30%. This applies to interest, dividends, royalties, pensions, and other payments not tied to work performed in the U.S. There are no brackets or deductions for this type of income.

However, the U.S. has tax treaties with many countries that can reduce or eliminate this withholding. For example, a nonresident from a treaty country may see their dividend withholding drop to 15% or even 0%. To claim a reduced treaty rate, you typically need to submit Form W-8BEN to the party paying you.

Effectively Connected Income (ECI) vs. FDAP Income

This distinction is essential for nonresident aliens because each category follows completely different tax rules. ECI refers to earnings directly linked to a U.S. trade or business, most commonly wages from a U.S. employer. ECI is taxed at the same graduated rates that apply to resident aliens, and you are allowed to claim deductions against it to reduce your taxable amount.

FDAP income covers passive earnings like interest, dividends, rent, and royalties. It is taxed at the flat 30% rate (or a lower treaty rate) with no deductions allowed. The practical difference is significant: if you earn $80,000 in U.S. wages as a nonresident, that income is taxed progressively and you can subtract allowable expenses. But if you receive $10,000 in U.S. dividends, the IRS withholds $3,000 (30%) at the source with no offsets. Knowing how to classify your income helps you plan ahead and avoid unexpected withholding.

Social Security, Medicare, and FICA Taxes

Beyond federal income tax, most U.S. workers also pay into Social Security and Medicare. These payroll taxes are collectively called FICA taxes (Federal Insurance Contributions Act). Whether you owe FICA as a foreign worker depends mainly on your visa type and tax residency status.

Overview

Employees pay 6.2% toward Social Security (up to a wage cap of $176,100 in 2025) and 1.45% toward Medicare, for a combined rate of 7.65%. Employers match this amount, bringing the total to 15.3%. Resident aliens owe FICA on the same terms as U.S. citizens, but certain nonresident aliens on specific visas may be fully exempt for a limited number of years.

Visa Categories Exempt From FICA (F-1, J-1, M-1, Q-1)

The IRS grants a FICA exemption to nonresident aliens on F-1, J-1, M-1, or Q-1 visas, as long as they remain nonresidents for tax purposes and their employment is authorized and connected to the purpose of their visa. This exemption exists because FICA funds are designed to support U.S. citizens and permanent residents in retirement, and foreign nationals on temporary visas are not expected to collect those benefits long-term.

Students on F-1 or J-1 visas can be exempt for up to five calendar years from the date they first entered the United States. Scholars, teachers, and researchers on J-1 visas (who are not students) are exempt for the first two calendar years. The IRS counts partial years as full calendar years, so even arriving in December means that year counts as your first. This exemption also covers authorized practical training like CPT or OPT. Spouses and dependents on accompanying visas (F-2, J-2) do not qualify.

When FICA Withholding Becomes Mandatory

FICA withholding starts once you no longer qualify for the exemption. The most common trigger is the passage of time: once a student has been in the U.S. for more than five calendar years, or a J-1 scholar for more than two, they typically become resident aliens under the Substantial Presence Test and lose their exempt status.

Changing visa status also triggers FICA. If you move from an F-1 or J-1 to an H-1B, the exemption ends immediately on the date the new status takes effect. H-1B, TN, O-1, and E-3 visa holders are never eligible for the FICA exemption. If your employer mistakenly withheld FICA while you were exempt, you can request a refund through your employer or file Form 843 with Form 8316 directly with the IRS.

State and Local Taxes

Federal taxes are only part of the picture. Most U.S. states also collect income tax on wages earned within their borders. As a foreign worker, you are generally subject to state income tax where you live or work, regardless of your federal classification.

States With No Income Tax

Nine states do not collect personal income tax on wages: Alaska, Florida, Nevada, New Hampshire, South Dakota, Tennessee, Texas, Washington, and Wyoming. Working in one of these states means no state income tax deduction from your paycheck. However, according to the Washington State Department of Revenue, Washington imposes a capital gains tax on the sale of long-term capital assets: 7% on the first $1 million of taxable gains and 9.9% on gains exceeding $1 million, effective retroactively from January 1, 2025.

These states make up for missing revenue through other means, like higher sales taxes or property taxes. For example, according to the Tax Foundation, Tennessee has one of the highest combined state and local sales tax rates at approximately 9.61%, while Texas and New Hampshire rely heavily on property taxes. When choosing where to live, consider the full picture of taxes, not just the income tax rate.

How State Tax Rules Differ From Federal Rules

State tax systems do not always follow federal rules, and this is especially important for foreign workers. One key difference is that federal tax treaties generally do not apply at the state level. This means that even if your wages are fully or partially exempt from federal income tax under a treaty, the state where you work may still tax that income. Your employer may still need to issue a W-2 reporting state wages, even when federal wages appear on Form 1042-S due to a treaty exemption.

Each state also has its own rules for determining tax residency, such as where you maintain a permanent home or how many days you spent there during the year. Filing requirements vary as well. Some states require a separate return for nonresidents who earned income there, even if you lived elsewhere for most of the year. Because of these differences, pay careful attention to the specific tax rules in your state, as the obligations may not match what you expect based on your federal filing.

Understanding Your Paycheck

When you receive your first U.S. paycheck, you will notice the deposited amount is considerably less than your stated salary. This is because your employer withholds several types of taxes before paying you. Understanding the forms and deductions that appear on your pay stub will help you avoid confusion.

Understanding W-4, W-2, and 1099 Forms

The W-4 is the form you fill out when starting a new job. It tells your employer how much federal income tax to withhold from each paycheck. The information you provide, such as your filing status and any additional withholding you request, directly affects your take-home pay throughout the year. Nonresident aliens must follow special instructions: write “Nonresident Alien” or “NRA” below Step 4(c), and you cannot claim “EXEMPT” status on the form.

The W-2 is sent to you after the tax year ends (usually by the end of January) and summarizes your total wages, federal and state taxes withheld, and Social Security and Medicare contributions. You will need this form when filing your annual tax return. If part of your wages was exempt under a tax treaty, the exempt amount may appear on Form 1042-S instead. If you worked as an independent contractor, you would receive a 1099-NEC rather than a W-2. This form reports total pay, but no taxes are withheld, so you are responsible for calculating and paying your own income tax and self-employment tax.

Common Deductions You Will See on Your Pay Stub

Your pay stub shows how your gross pay is reduced to net pay. The largest deductions are typically federal income tax and state income tax (if applicable). Below that, you will see Social Security tax (often listed as “OASDI” or “SS”) and Medicare tax. If you are a nonresident alien on an exempt visa, these lines should show zero. If they do not, your employer may be withholding in error, and you should raise this right away.

Some pay stubs also show deductions for benefits like health insurance premiums, 401(k) contributions, or commuter benefits. These are not taxes, but they do reduce your take-home pay. Reviewing your pay stub each period helps confirm your withholding is accurate.

Filing Your Tax Return as a Foreign Worker

Filing an annual tax return is required for most foreign workers earning U.S. income. The form you use, the deadline, and the identification number you need all depend on your tax residency status.

Which Form to File (1040-NR vs. 1040)

Resident aliens file Form 1040, the same form used by U.S. citizens, which captures worldwide income and allows the standard deduction and tax credits. Nonresident aliens file Form 1040-NR, reporting only U.S.-source income, with effectively connected income on the main pages and FDAP income on Schedule NEC.

Dual-status taxpayers file based on their status on December 31. If you are a resident at year-end, Form 1040 is the primary return with Form 1040-NR attached as a “Dual-Status Statement.” If you are a nonresident at year-end, it is the reverse. In all dual-status cases, write “Dual-Status Return” across the top, and note that these returns must be printed and mailed.

Key Deadlines and Extensions

If you are a resident alien or a nonresident alien who received wages with U.S. withholding, your return is generally due by April 15. Nonresident aliens whose only U.S. income was investment income typically have until June 15.

According to the IRS, the failure-to-file penalty is 5% of unpaid tax per month (up to 25%), plus a late-payment penalty of 0.5% per month with interest. You can file Form 4868 for an automatic extension to October 15, but this only extends the filing deadline, not the payment deadline. Estimate and pay what you owe by the original due date to avoid interest.

Getting an ITIN If You Do Not Have an SSN

To file a U.S. tax return, you need a taxpayer identification number. Most authorized workers will have a Social Security Number (SSN). If you are not eligible for one (for example, because your visa does not authorize employment, or you are filing as a spouse or dependent), you will need an Individual Taxpayer Identification Number (ITIN).

An ITIN is a nine-digit number beginning with 9, issued by the IRS solely for federal tax purposes. It does not authorize you to work in the U.S. and does not serve as identification outside of the tax system. To apply, complete Form W-7 and submit it along with your federal tax return and documents that verify your identity and foreign status, such as a valid passport. You can mail the application, visit an IRS office in person, or use an IRS-authorized Acceptance Agent who can certify your documents so you do not have to send originals. Processing times range from several weeks to five months during busy season. An ITIN that has not been used on a tax return for three consecutive years will expire and need to be renewed.

FAQ

Q. Do foreign employees pay U.S. taxes?

A. Yes, most foreign employees working in the United States are required to pay some form of U.S. tax. Resident aliens are taxed on worldwide income, while nonresident aliens are taxed only on U.S.-source income. Your specific obligations depend on your tax residency classification, which is determined by the Green Card Test or the Substantial Presence Test.

Q. How do I avoid 30% withholding tax?

A. The 30% flat withholding applies to certain passive income paid to nonresident aliens, such as dividends, interest, and royalties. The most common way to reduce it is by claiming benefits under a tax treaty between the U.S. and your home country. To do this, submit Form W-8BEN to the party making the payment before the income is paid. Treaty benefits vary by country and income type, so review the specific terms for your situation.

Q. Can I get a tax refund as a foreign worker?

A. Yes, it is possible. If your employer withheld more tax than you actually owe, you can receive the difference as a refund by filing a tax return. This commonly happens when your income was lower than expected, when treaty benefits were not applied during the year, or when FICA taxes were incorrectly withheld from a nonresident on an exempt visa. Filing your return is the only way to claim overpaid taxes back.

Conclusion

U.S. taxes can feel overwhelming at first, but the system becomes more manageable once you understand how your residency status shapes your obligations. Each piece of knowledge, from knowing which form to file to checking whether a treaty lowers your withholding, puts you in greater control of your finances. If your situation is complex, consider consulting a tax professional who specializes in international tax matters.