Moving to the United States is one of the most exciting life decisions you can make — but it also comes with a complex tax system that catches many expats off guard. Understanding expat income tax in the United States before you arrive can save you thousands of dollars and prevent costly compliance mistakes.

Whether you're relocating for work, joining a spouse, or starting a new chapter, the U.S. tax system operates differently from most other countries. The federal government, state governments, and sometimes even cities can all tax your income. This United States expat tax guide breaks down everything you need to know for the 2025/2026 tax year, including tax rates, filing obligations, key deadlines, and strategies to minimize your burden.

Use our United States Income Tax Calculator to get a quick estimate of your federal tax liability based on your expected earnings.

How the U.S. Tax System Works for Expats

The United States uses a progressive federal income tax system, meaning the more you earn, the higher the rate applied to your top bracket of income. But the tax landscape doesn't end at the federal level.

Key Features of the U.S. Tax System

  • Federal income tax is collected by the Internal Revenue Service (IRS) and applies to all residents regardless of where the income is earned.
  • State income tax varies by state — some states like Texas and Florida have no state income tax, while others like California and New York impose rates exceeding 10%.
  • Local/city taxes apply in certain jurisdictions (e.g., New York City, Philadelphia).
  • FICA taxes (Social Security and Medicare) are withheld from employment income at a combined rate of 7.65% for employees (matched by employers).
  • The tax year runs from January 1 to December 31, with the annual filing deadline of April 15 of the following year.

Residency and Tax Obligations

For U.S. tax purposes, you are considered a tax resident if you meet either:

  1. The Green Card Test — You hold a U.S. permanent resident card (green card) at any point during the year.
  2. The Substantial Presence Test — You were physically present in the U.S. for at least 31 days during the current year AND at least 183 days over a three-year period using a weighted formula (all days in the current year + 1/3 of days in the prior year + 1/6 of days two years prior).

Once you become a U.S. tax resident, you are generally taxed on your worldwide income — including wages, self-employment income, investments, rental income, and even income earned abroad.

2025/2026 Federal Income Tax Rates and Brackets

The U.S. federal income tax rates for the 2025 tax year (returns filed in 2026) are structured into seven brackets. The rates themselves remain unchanged from recent years, but the bracket thresholds are adjusted annually for inflation.

Single Filers (2025 Tax Year)

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 Year)

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%

Practical Example

If you're a single expat earning $85,000 in gross wages in 2025, here's a simplified breakdown of your federal tax:

  • First $11,925 at 10% = $1,192.50
  • $11,926 to $48,475 at 12% = $4,385.88
  • $48,476 to $85,000 at 22% = $8,035.28
  • Total federal tax: approximately $13,614

This doesn't account for deductions, credits, or state taxes. Try our United States Income Tax Calculator for a more personalized estimate.

The Standard Deduction

Most taxpayers claim the standard deduction rather than itemizing. For 2025:

  • Single filers: $15,000
  • Married filing jointly: $30,000
  • Head of household: $22,500

This means a single filer earning $85,000 would only pay tax on $70,000 of taxable income after applying the standard deduction, significantly reducing the effective tax rate.

State Income Taxes: Choosing Where You Live Matters

One of the biggest variables in your moving to United States taxes calculation is the state you choose to live in. State income tax can add anywhere from 0% to over 13% to your total tax burden.

States With No Income Tax (2025)

  • Alaska
  • Florida
  • Nevada
  • New Hampshire (taxes only interest and dividends — phasing out by 2027)
  • South Dakota
  • Tennessee
  • Texas
  • Washington
  • Wyoming

States With the Highest Income Tax Rates

  • 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%)

Impact on Expats

If you have flexibility in where you'll be based, this is one of the most powerful tax-planning decisions you can make. An expat earning $150,000 in Texas could save over $12,000 per year compared to earning the same salary in California, purely on state income tax.

Filing Requirements and Key Deadlines

Understanding your filing obligations is critical. The IRS imposes significant penalties for late filing and late payment.

Who Must File?

You must file a federal income tax return if your gross income exceeds certain thresholds, which for 2025 are approximately:

  • Single, under 65: $15,000
  • Married filing jointly, both under 65: $30,000
  • Self-employed: $400 or more in net self-employment income

As an expat working in the U.S. on a valid visa, you will almost certainly need to file.

Important Deadlines for 2025 Tax Year

  1. April 15, 2026 — Federal income tax return due (Form 1040). Also the deadline for first estimated tax payment for Q1 2026.
  2. June 15, 2026 — Automatic 2-month extension for U.S. citizens and residents living abroad.
  3. October 15, 2026 — Extended filing deadline if you file Form 4868 by April 15.
  4. Quarterly estimated taxes (if applicable): Due April 15, June 15, September 15, and January 15.

Key Forms for Expats

  • Form 1040 — U.S. Individual Income Tax Return (the main form everyone files)
  • Form W-4 — Employee's Withholding Certificate (given to your employer)
  • Form W-2 — Wage and Tax Statement (received from your employer)
  • Form 1099 — Reports various types of non-wage income
  • Schedule C — For self-employment income
  • FBAR (FinCEN Form 114) — Required if you have foreign bank accounts with an aggregate balance exceeding $10,000 at any point during the year
  • Form 8938 (FATCA) — Statement of Specified Foreign Financial Assets, required for higher thresholds

Tax Treaties and Avoiding Double Taxation

If you're moving to the United States from another country, you may be concerned about being taxed on the same income in both your home country and the U.S. The good news is that the United States has income tax treaties with over 65 countries, including the United Kingdom, Canada, Germany, Australia, India, Japan, France, and many others.

How Tax Treaties Help Expats

  • Reduced withholding rates on dividends, interest, and royalties
  • Exemptions for certain types of income (e.g., pensions, teaching income, or student income under specific treaty provisions)
  • Tie-breaker rules to determine tax residency when you could be considered a resident of two countries
  • Foreign tax credits — Even without a treaty, you can generally claim a credit on your U.S. return (Form 1116) for taxes paid to a foreign government on the same income

Totalization Agreements

The U.S. also has Social Security Totalization Agreements with about 30 countries. These agreements prevent you from paying social security taxes in both countries simultaneously and allow you to combine work credits from both countries to qualify for benefits.

Countries with Totalization Agreements include the UK, Canada, Germany, South Korea, Japan, Australia, and others. If you're moving from one of these countries, you may be able to remain in your home country's social security system for a limited period.

Common Mistakes Expats Make With U.S. Taxes

The U.S. tax code is notoriously complex. Here are the most common errors new arrivals make:

1. Ignoring State Tax Obligations

Many expats focus exclusively on federal taxes and forget that state taxes can add a significant amount to their bill. Research your state's requirements before you move.

2. Failing to Report Foreign Income and Assets

As a U.S. tax resident, you must report worldwide income, including:

  • Interest from foreign bank accounts
  • Rental income from property abroad
  • Foreign pensions or retirement accounts
  • Capital gains on foreign investments

Failure to file FBAR or FATCA reports can result in penalties of $10,000 or more per violation.

3. Not Understanding the First-Year Dual-Status Rules

In your first year in the U.S., you may be a dual-status taxpayer — a nonresident for part of the year and a resident for the rest. This affects how your income is taxed and which deductions you can claim. Some expats can elect to be treated as a full-year resident (e.g., under the "first-year election"), which may be beneficial if it allows you to file jointly with a spouse.

4. Mishandling Foreign Retirement Accounts

Many expats don't realize that foreign retirement accounts (like a UK ISA, Canadian RRSP, or Australian superannuation) may not receive the same tax-deferred treatment in the U.S. that they do in the home country. Income or gains within these accounts may be taxable in the U.S. each year.

5. Missing Estimated Tax Payments

If you have income that isn't subject to withholding (freelance income, rental income, investment gains), you may need to make quarterly estimated tax payments. Missing these can result in underpayment penalties.

6. Overlooking Available Credits and Deductions

  • Foreign Tax Credit (Form 1116) — Offsets U.S. tax on income already taxed abroad
  • Child Tax Credit — Up to $2,000 per qualifying child
  • Earned Income Tax Credit — Available to lower-income workers
  • Education credits — For qualifying tuition expenses
  • Retirement contributions — 401(k) and IRA contributions reduce taxable income

Practical Steps for Expats Moving to the United States

Here's a step-by-step action plan to get your U.S. tax situation in order:

  1. Obtain your tax identification number — You'll need a Social Security Number (SSN) if you're authorized to work, or an Individual Taxpayer Identification Number (ITIN) if not.
  2. Understand your residency status — Determine whether you'll be a resident or nonresident alien for your first year, and whether the dual-status or first-year election applies.
  3. Research your state's tax rules — If you have a choice of where to live, factor in state income tax rates.
  4. Organize your foreign financial information — List all foreign bank accounts, investments, pensions, and property. Determine your FBAR and FATCA reporting obligations.
  5. Review applicable tax treaties — Check whether a treaty between the U.S. and your home country provides any exemptions or reduced rates.
  6. Set up proper withholding — Complete Form W-4 accurately with your employer. If you have other income, set up quarterly estimated payments.
  7. Estimate your tax liability — Use the United States Income Tax Calculator to model different income scenarios.
  8. Hire a tax professional — Especially for your first year, consider working with a CPA or enrolled agent who specializes in expat taxation.

Frequently Asked Questions

Do I have to pay U.S. taxes on income earned before I moved?

Generally, no. If you were a nonresident alien before arriving, you're only taxed on U.S.-sourced income for that period. Once you become a tax resident, your worldwide income becomes taxable from that date forward.

Can I keep my foreign bank accounts?

Yes, but you must report them. If the combined balance of all your foreign accounts exceeds $10,000 at any point during the year, you must file an FBAR. Additional reporting under FATCA (Form 8938) may also apply.

Will I be double-taxed on my income?

In most cases, no. Between tax treaties and the Foreign Tax Credit, the U.S. tax system provides mechanisms to avoid or minimize double taxation. However, the interaction between systems can be complex, especially with investment income and pensions.

What if I leave the U.S. mid-year?

You may file as a dual-status taxpayer for that year, reporting worldwide income only for the portion of the year you were a resident, and only U.S.-sourced income for the nonresident portion.

Is there a wealth tax or inheritance tax in the U.S.?

The U.S. does not have a federal wealth tax. However, it does have a federal estate tax (applied at death) with an exemption of approximately $13.99 million per individual in 2025. Some states also impose their own estate or inheritance taxes with lower thresholds.

Conclusion: Plan Ahead and Stay Compliant

Moving to the United States taxes your patience as much as your wallet — the system is complex, but it's entirely manageable with proper planning. Here are the key takeaways:

  • You'll be taxed on worldwide income once you become a U.S. tax resident.
  • Federal rates range from 10% to 37%, and state taxes can add 0% to 13%+ depending on where you live.
  • Report all foreign accounts and assets — penalties for non-compliance are severe.
  • Tax treaties and foreign tax credits can prevent double taxation.
  • Your first year is the trickiest — dual-status rules, first-year elections, and transition issues require careful attention.
  • Use tools and professionals — The United States Income Tax Calculator can give you a quick estimate, but a qualified tax advisor is invaluable for your specific situation.

The earlier you start planning, the smoother your transition will be. Welcome to the United States — and to one of the world's most intricate tax systems.

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.