Relocating to the United States is an exciting life decision — but it comes with a tax system that can be complex, even for Americans who've lived with it their entire lives. If you're an expat moving to the United States, understanding how expat income tax in the United States works is absolutely essential to staying compliant and avoiding costly penalties.
The U.S. operates one of the most far-reaching tax systems in the world. Whether you're arriving on a work visa, transferring with a multinational employer, or joining a spouse, the IRS (Internal Revenue Service) will likely have an interest in your worldwide income. This United States expat tax guide breaks down everything you need to know for the 2025/2026 tax year, including federal tax brackets, state taxes, filing deadlines, and strategies to minimize double taxation.
Use our United States Income Tax Calculator to get a quick estimate of your potential tax liability before you even land.
How the U.S. Tax System Works for Expats
The United States taxes individuals based on two key criteria: residency status and source of income. As an expat moving to the United States, your tax obligations will depend heavily on whether the IRS classifies you as a resident alien or a non-resident alien.
Resident Alien vs. Non-Resident Alien
- Resident Alien: If you hold a U.S. green card (the "Green Card Test") or meet the "Substantial Presence Test" — meaning you've been physically present in the U.S. for at least 183 days during a three-year rolling period using a weighted formula — you're generally taxed on your worldwide income, just like a U.S. citizen.
- Non-Resident Alien: If you don't meet either test, you're typically taxed only on income that is sourced within the United States (e.g., wages earned for work performed in the U.S., rental income from U.S. properties, or certain investment income).
Most expats who move to the United States for work will become resident aliens within their first or second year, which means global income — including foreign bank interest, rental income from your home country, and overseas investments — becomes reportable to the IRS.
The Substantial Presence Test Explained
The Substantial Presence Test uses a weighted day count across three years:
- All days you were present in the current year, plus
- 1/3 of the days you were present in the prior year, plus
- 1/6 of the days you were present in the year before that
If the total is 183 days or more and you were present for at least 31 days in the current year, you meet the test and are treated as a resident alien for tax purposes.
Example: If you moved to the U.S. on July 1, 2025, you'd have approximately 184 days of presence in 2025. That alone meets the 183-day threshold, making you a resident alien for the 2025 tax year.
2025 Federal Income Tax Brackets and Rates
The United States uses a progressive federal income tax system with seven tax brackets. For the 2025 tax year (returns filed in early 2026), the brackets for the most common filing statuses are as follows:
Single Filers – 2025 Tax Brackets
| Taxable Income | Tax Rate |
|---|---|
| $0 – $11,925 | 10% |
| $11,926 – $48,475 | 12% |
| $48,476 – $103,350 | 22% |
| $103,351 – $197,300 | 24% |
| $197,301 – $250,525 | 32% |
| $250,526 – $626,350 | 35% |
| Over $626,350 | 37% |
Married Filing Jointly – 2025 Tax Brackets
| Taxable Income | Tax Rate |
|---|---|
| $0 – $23,850 | 10% |
| $23,851 – $96,950 | 12% |
| $96,951 – $206,700 | 22% |
| $206,701 – $394,600 | 24% |
| $394,601 – $501,050 | 32% |
| $501,051 – $751,600 | 35% |
| Over $751,600 | 37% |
Important: These are marginal tax rates. You don't pay 24% on your entire income if you fall into that bracket — only the portion of income within that range is taxed at that rate.
Standard Deduction for 2025
Before applying the tax brackets, most taxpayers reduce their gross income by the standard deduction:
- Single: $15,000
- Married Filing Jointly: $30,000
- Head of Household: $22,500
Practical Example: If you're a single expat earning $85,000 in salary in 2025, your taxable income after the standard deduction would be approximately $70,000. Your federal tax liability would be roughly:
- 10% on the first $11,925 = $1,192.50
- 12% on $11,926 – $48,475 = $4,386
- 22% on $48,476 – $70,000 = $4,735.28
- Total: approximately $10,314
Want a precise calculation? Try our United States Income Tax Calculator to see exactly where you stand.
State and Local Taxes: The Hidden Layer
One of the biggest surprises for expats moving to the United States is that federal income tax is only part of the picture. Most U.S. states impose their own income taxes on top of the federal tax.
States With No Income Tax
As of 2025, the following states levy no state income tax on earned income:
- Alaska
- Florida
- Nevada
- New Hampshire (taxes interest and dividends only, phasing out)
- South Dakota
- Tennessee
- Texas
- Washington
- Wyoming
If you have flexibility in choosing where to live, relocating to one of these states can save you thousands of dollars annually.
States With the Highest Income Tax Rates
On the other end of the spectrum, some states impose significant income taxes:
- California: Up to 13.3%
- Hawaii: Up to 11%
- New Jersey: Up to 10.75%
- Oregon: Up to 9.9%
- Minnesota: Up to 9.85%
- New York: Up to 10.9% (plus New York City tax of up to 3.876% for NYC residents)
Example: An expat earning $150,000 in New York City could face a combined marginal rate of over 50% when you add federal, state, and city income taxes together. In contrast, the same salary earned in Texas would only face the federal rate.
Local Taxes
Some cities and municipalities also impose local income taxes. New York City, Philadelphia, and various cities in Ohio are notable examples. Always check local tax obligations in your specific area.
Double Taxation: Tax Treaties and Foreign Tax Credits
One of the biggest concerns for expats is being taxed on the same income by both the United States and their home country. Fortunately, the U.S. has mechanisms to mitigate this.
U.S. Tax Treaties
The United States has income tax treaties with over 65 countries, including the United Kingdom, Canada, Germany, France, Australia, Japan, India, and many others. These treaties can:
- Reduce or eliminate U.S. tax on certain types of income (pensions, dividends, interest, royalties)
- Establish tie-breaker rules for determining residency when you might be considered a tax resident in two countries
- Provide exemptions for specific categories of workers, such as teachers, researchers, or students
For example, under the U.S.-U.K. tax treaty, a British expat's U.K. pension may be taxable only in the U.K. under certain conditions, or at a reduced rate in the U.S.
Always check whether your home country has a tax treaty with the United States, as treaty benefits can save you significant money — but you typically must claim treaty benefits by filing the proper forms (e.g., Form 8833).
Foreign Tax Credit (Form 1116)
If you've already paid income tax to another country on the same income, you can generally claim a Foreign Tax Credit on your U.S. tax return using IRS Form 1116. This credit directly reduces your U.S. tax liability dollar-for-dollar, up to the amount of U.S. tax attributable to that foreign income.
Example: If you owe $5,000 in U.S. federal tax on foreign rental income and you've already paid $4,000 in tax on that income in your home country, you can claim a $4,000 credit, reducing your U.S. tax on that income to $1,000.
Totalization Agreements (Social Security)
Separate from income tax, the U.S. also has Totalization Agreements with about 30 countries to prevent double social security taxation. These agreements determine which country's social security system covers you during your assignment, potentially saving you and your employer significant payroll tax costs.
Key Filing Requirements and Deadlines for 2025
Staying compliant with IRS filing requirements is critical. Here are the essentials every expat should know.
Tax Year and Filing Deadline
- The U.S. tax year runs January 1 – December 31 (calendar year)
- The standard filing deadline for 2025 tax returns is April 15, 2026
- Expats living abroad get an automatic 2-month extension to June 15, 2026 (though interest on any tax owed still accrues from April 15)
- You can request an additional extension to October 15, 2026 by filing Form 4868
Forms You May Need
- Form 1040: The main U.S. individual income tax return (used by resident aliens)
- Form 1040-NR: Used by non-resident aliens for U.S.-sourced income
- Form W-4: Submitted to your employer to determine withholding
- Form 8833: Treaty-based return position disclosure
- Form 1116: Foreign Tax Credit claim
- FBAR (FinCEN Form 114): Required if you have foreign bank accounts with an aggregate balance exceeding $10,000 at any point during the year (due April 15, with automatic extension to October 15)
- Form 8938 (FATCA): Statement of Specified Foreign Financial Assets — required if your foreign assets exceed certain thresholds ($200,000 for single filers living in the U.S. at year-end, or $50,000 on the last day of the tax year)
Social Security and Medicare Taxes
In addition to income tax, most workers in the U.S. pay:
- Social Security tax: 6.2% on earnings up to $176,100 (2025 wage base)
- Medicare tax: 1.45% on all earnings, plus an additional 0.9% on earnings above $200,000 (single) or $250,000 (married filing jointly)
Your employer matches these amounts, so the combined rate is 15.3% up to the Social Security wage base.
Common Mistakes Expats Make with U.S. Taxes
Avoiding these pitfalls can save you significant money and stress:
1. Assuming You Don't Owe U.S. Tax on Foreign Income
Once you're a resident alien, all worldwide income is taxable in the U.S. — including foreign rental income, overseas investment gains, and interest from foreign bank accounts. Failing to report this income can result in severe penalties.
2. Forgetting to File FBAR and FATCA Reports
The penalties for failing to file an FBAR can reach $10,000 per violation (per account, per year) for non-willful violations, and up to $100,000 or 50% of the account balance for willful violations. These are among the harshest penalties in the U.S. tax code. If you have bank accounts, investments, or pension accounts in your home country, you likely need to file these forms.
3. Not Claiming Tax Treaty Benefits
Many expats leave money on the table by not properly claiming treaty benefits. If your home country has a tax treaty with the U.S., review it carefully or work with a cross-border tax professional.
4. Confusing the Foreign Earned Income Exclusion with Expat Arrivals
The Foreign Earned Income Exclusion (FEIE) — which allows exclusion of up to $130,000 in foreign earned income in 2025 — generally benefits Americans living abroad, not expats living in the U.S. If you're physically present in the United States, this exclusion typically won't apply to you. It's a common misconception among newly arriving expats.
5. Ignoring State Tax Obligations
Some expats focus exclusively on federal taxes and overlook state and local filing requirements. Each state has its own rules, deadlines, and forms.
Practical Tips for Expats Moving to the United States
Here's a step-by-step approach to managing your move from a tax perspective:
- Determine your residency status as early as possible — understand whether you'll be a resident or non-resident alien in your first year
- Review the applicable tax treaty between the U.S. and your home country
- Inventory your foreign financial assets — bank accounts, pensions, investments, and property — to understand FBAR and FATCA obligations
- Obtain a Social Security Number (SSN) or Individual Taxpayer Identification Number (ITIN) — you'll need one to file a U.S. tax return
- Consider the first-year choice election — in your arrival year, you may be able to elect to be treated as a resident alien for the entire year, which can be beneficial if you're married to a U.S. citizen or resident
- Set up estimated tax payments if you have income not subject to withholding (self-employment, rental income, investment income)
- Keep meticulous records of foreign taxes paid, as you'll need documentation to claim Foreign Tax Credits
- Hire a qualified cross-border tax professional — the intersection of U.S. tax law and your home country's tax rules is complex enough to warrant expert help in most situations
Estimate your federal income tax quickly using our United States Income Tax Calculator and start planning your finances before you arrive.
Frequently Asked Questions
Do I have to pay U.S. taxes if I'm on a temporary work visa?
Yes, in most cases. If you're working in the U.S. on an H-1B, L-1, O-1, or similar work visa and meet the Substantial Presence Test, you'll be taxed as a resident alien on your worldwide income. Some visa categories (like certain J-1 or F-1 visa holders) have special exemptions from the Substantial Presence Test for a limited number of years.
Can I be a tax resident in both the U.S. and my home country?
Yes, dual tax residency is possible and not uncommon. Tax treaties contain tie-breaker provisions to resolve this, and you can use Foreign Tax Credits to offset double taxation.
When should I file my first U.S. tax return?
If you arrive in 2025 and earn income, you'll file your first U.S. tax return by April 15, 2026 (or June 15, 2026, if you qualify for the automatic extension for taxpayers abroad). Even if you arrive late in the year, you must report any U.S.-sourced income earned during that period.
Is my foreign pension taxable in the U.S.?
Potentially, yes. As a resident alien, distributions from foreign pensions are generally taxable in the U.S., though tax treaties may reduce or eliminate the tax. The treatment of contributions to foreign pensions while you're a U.S. tax resident is also complex — U.S. tax law generally does not recognize the tax-deferred status of foreign pension plans.
Do I need to report my foreign property?
Real property itself is not reported on FBAR or FATCA forms, but the bank accounts used to manage that property, and any rental income it generates, must be reported.
Conclusion: Plan Early and Stay Compliant
Moving to the United States as an expat opens up incredible personal and professional opportunities — but it also means entering one of the world's most complex tax systems. The key takeaways from this United States expat tax guide are:
- Determine your residency status early, as it dictates whether you're taxed on worldwide or U.S.-only income
- Federal income tax rates for 2025 range from 10% to 37%, and state taxes can add significantly to your burden
- Tax treaties and Foreign Tax Credits are your primary tools for avoiding double taxation
- Foreign asset reporting requirements (FBAR, FATCA) carry severe penalties for non-compliance
- Don't overlook state and local taxes — where you live in the U.S. can dramatically affect your total tax bill
Start planning now by using our United States Income Tax Calculator to estimate your 2025 federal tax liability, and consider engaging a cross-border tax professional to navigate the transition smoothly.
This article is for informational purposes only and does not constitute tax advice. Tax laws change frequently; consult a qualified tax professional for advice specific to your situation.