Don’t pay taxes twice! How to Keep From Making Money Mistakes as an US Expat

Frederik Pohl
Updated: April 14, 2026

Whether it’s for being a digital nomad, work, love, or just to change things up, you’re now an expat. You have the whole world in front of you, but let’s be honest: the tax consequences can feel more like a tangled fishing net. The good news is? You aren’t the only one who feels this way. With some help, you can sail through these waters like a pro. This guide isn’t just a list of rules; it’s also meant to help you avoid common mistakes that could cost you a lot of money and peace of mind.

lawyer
Speak with an Expert Today!
Name

The Expat Tax Tightrope: How to Get Through the Double-Taxation Minefield

Being an expat adds an interesting level of complexity to your finances. It’s hard to deny that new cultures and experiences are exciting, but if you’re not ready, the tax situation can quickly become stressful. What do a lot of expats fear the most? Double taxation is when two different countries want to tax your income. It’s a valid worry, but there are ways to stop it from happening if you know how to use them correctly.

What makes taxes hard for expats

Most countries tax people based on where they live. But the United States works differently. It taxes its citizens based on their citizenship, no matter where they live. This is why U.S. expats have tax problems that people from most other countries don’t have. You’re not just dealing with the tax laws of the country you’re living in; you’re also dealing with the complicated web of U.S. tax laws. It can feel like you’re running two races at once, each with its own finish line and set of rules. This dual responsibility calls for a proactive and knowledgeable approach.

The Golden Rule: Getting to Know U.S. Taxes Based on Citizenship

The idea of citizenship-based taxation is at the center of every U.S. expat’s tax journey. You need to understand this basic idea in order to make sense of everything else. The IRS sees you as a taxpayer if you have a U.S. passport, no matter where you live or work.

As a U.S. citizen, you must file a U.S. tax return every year, no matter where you live or where you earned your income. This is true even if you live in another country. You don’t have to pay taxes on all that money right away, but you do have to file. A lot of expats miss this important difference, which can cause bigger problems later on. Think of it as a requirement to report. After you report it, you can use different exclusions and credits to lower or get rid of your U.S. tax bill.

The Foreign Earned Income Exclusion (FEIE): Your First Line of Defense

For good reason, the Foreign Earned Income Exclusion (FEIE) is often the first thing expats use. It lets you keep a big part of the money you make abroad from being taxed in the U.S. This amount is $126,500 for 2024. If you make less than this amount from your job or self-employment abroad, you probably won’t have to pay U.S. federal income tax on that money.

You can only get the FEIE if you pass one of two tests:

  • The Bona Fide Residence Test says that you must live in a foreign country for an entire tax year without leaving. This means making a real home in another country.
  • The Physical Presence Test says that you must be in a foreign country for at least 330 full days during any 12-month period. People who move around a lot can often prove this more easily.

It’s important to know that the FEIE only applies to earned income, which includes wages, salaries, professional fees, and income from self-employment. It doesn’t apply to passive income, which includes things like dividends, interest, capital gains, and rental income. It’s like protecting the money you work hard for.

What if your income is higher than the FEIE limit or you have passive income that is taxed in another country? The Foreign Tax Credit (FTC) is what you need to do. The FTC lets you lower your U.S. tax bill by the amount of income taxes you’ve paid to a foreign government. It’s like lowering your U.S. tax bill by a dollar for every dollar you spend.

Think about making $150,000 in a country other than your own. You leave out $126,500 with the FEIE. The last $23,500 is still taxable in the U.S. If you paid income tax on the whole $150,000 to your host country, you can use the FTC to lower the U.S. tax you owe on the $23,500. The FTC is great because it stops people from being taxed twice on the same income. In general, you can’t claim both the FEIE and the FTC on the same income. However, you can use them together in a smart way: use the FEIE for earned income up to the limit and the FTC for any U.S.-taxable income (including passive income) on which you paid foreign taxes.

The Unsung Heroes of Expat Tax Planning: Tax Treaties

The U.S. has signed income tax treaties with many other countries besides the FEIE and FTC. These treaties are agreements between two countries that are meant to stop double taxation, make it clear who has the right to tax, and sometimes even lower tax rates or exempt certain types of income.

A tax treaty is like a special set of rules that apply in certain situations and override domestic tax law. For example, a treaty might say that a certain type of pension income is only taxable in one country, or that a student studying abroad doesn’t have to pay taxes in the host country for a short time. Getting to know the specific tax treaty between the U.S. and your host country can help you understand your tax obligations and find benefits that can save you money and make things less confusing. But keep in mind that you have to say on Form 8833 if you are taking a position on your tax return that goes against the Internal Revenue Code because of a tax treaty.

Avoid These Common Expat Tax Mistakes (Like a Pro)

It’s still easy to make mistakes, even with the tools above. Here are the most common mistakes that expats make and how to avoid them.

Mistake 1: Not paying attention to FATCA and Foreign Bank Account Reporting (FBAR)

This is probably the worst mistake you can make, not because of the taxes you owe, but because of the huge fines for not following the rules.

If the total balance of all your foreign financial accounts (bank accounts, brokerage accounts, mutual funds, etc.) is more than $10,000 at any time during the calendar year, you must electronically file FinCEN Form 114, Report of Foreign Bank and Financial Accounts, with the Financial Crimes Enforcement Network (FinCEN). You don’t file this with your tax return; you file it separately. The threshold adds up, so if you have two accounts with $6,000 each, you meet the requirement.

The Foreign Account Tax Compliance Act (FATCA) says that U.S. citizens and green card holders living outside the U.S. must report their foreign financial assets on Form 8938, Statement of Specified Foreign Financial Assets, if their value is above certain levels. For single filers living abroad, these thresholds are much higher than FBAR ($200,000 on the last day of the tax year or $300,000 at any other time during the year).

The most important thing to remember is that FBAR and FATCA are not taxes; they are reporting requirements. If you don’t file these, you could face big fines—tens of thousands of dollars, even if you didn’t avoid paying taxes. Don’t let these get away from you.

Mistake #2: Not remembering your state tax duties

Many expats forget about their state tax responsibilities because they are so focused on federal U.S. and foreign country taxes. Some states, like California, Virginia, and New Mexico, make it very hard to break tax residency even if you’ve moved to another country. You may still be considered a resident of your old state by mistake, which means you have to pay state income taxes.

In most cases, you need to show that you really want to leave your home state in order to end your state tax residency. This could mean selling your house, registering to vote in another state (if you can), getting a new driver’s license, and not having strong ties to the state. Do a lot of research on the specific residency rules in your old state.

Mistake 3: Not knowing how to handle foreign retirement accounts

Pension and retirement accounts from other countries are very dangerous. The way they are taxed is very different depending on the type of account, the country it is in, and whether there is a tax treaty. Putting money into a foreign pension fund doesn’t mean it’s the same as a U.S. 401(k) or IRA. The IRS calls a lot of foreign retirement plans “foreign trusts,” which means they have to follow complicated and time-consuming reporting rules (like Form 3520, 3520-A). If you don’t follow the rules, you could face huge fines. Before putting money into or taking money out of foreign retirement accounts, always get professional advice.

Mistake 4: Not paying attention to the rules for gifts and inheritances from other countries

Getting a gift or inheritance from someone who isn’t in the U.S. In the U.S., gifts to a person are usually not taxable income for the person who gets them. However, if you get a lot of money or gifts from people in other countries, you have to report it. If you get a gift or gifts from a non-resident alien or foreign estate that are worth more than a certain amount (for example, more than $100,000 from a non-resident alien individual or foreign estate, or more than $17,339 from a foreign corporation or partnership in 2023), you have to report it on Form 3520, Annual Return to Report Transactions With Foreign Trusts and Receipt of Certain Foreign Gifts. If you don’t report, you could be fined up to 25% of the gift’s value.

Mistake 5: Not paying taxes on self-employment income

Self-employment can be a great way for an entrepreneurial expat to live and work abroad. But the U.S. self-employment tax (Social Security and Medicare taxes) applies to your net earnings from self-employment, no matter where those earnings come from. The FEIE can lower the amount of money you have to pay U.S. federal income tax on, but it can’t lower the amount of money you have to pay U.S. self-employment tax on. Many self-employed expats are shocked by this.

There are some exceptions, mostly if you live in a country that has a Totalization Agreement with the U.S. These deals stop people from having to pay social security taxes twice. If there is such an agreement and you are paying into the social security system of the country where you are living, you may not have to pay U.S. self-employment taxes. If not, plan for those taxes.

Mistake 6: Not realizing how important it is to get professional help

You wouldn’t try to do brain surgery just because you read a few articles online, would you? When it comes to the high stakes, expat tax is probably just as complicated as medical procedures. If your finances aren’t simple, the worst thing you can do is think you can handle everything on your own. An experienced expat tax professional is worth the money, not a cost. They can help you find ways to save money, avoid making mistakes that could cost you a lot of money, and make sure you follow the rules. This will give you peace of mind.

Proactive planning is the best way to avoid paying taxes twice.

Planning ahead is the best way to avoid tax problems. You shouldn’t wait until April 15th to start thinking about your taxes as an expat. Your financial records are like a detailed story about your tax year. The IRS will believe you more if you tell a good story. Keep detailed records of:

  • Pay stubs, bank statements showing deposits, and invoices for self-employment are all examples of income.
  • Expenses: Receipts for business costs, school costs, or any other costs you might be able to deduct.
  • Foreign Tax Payments: Proof of taxes paid to the country where you are living (like tax returns and payment confirmations).
  • Travel Dates: Entry and exit stamps and flight itineraries to show that you were really there for FEIE.
  • Foreign Account Balances: Monthly or yearly statements for all of your foreign bank and financial accounts to help with FBAR and FATCA.

Put everything on a computer and back it up. Keeping good records will save you a lot of time and stress, especially if you ever have to go through an audit.

Picking the Right Filing Status

Your tax rates, standard deduction, and eligibility for some credits depend on your filing status (for example, Single, Married Filing Jointly, Married Filing Separately, Head of Household, or Qualifying Widow(er)). If you are married to someone who is not a U.S. citizen, If you’re married to someone, you have more choices:

  • Married Filing Separately means that you file as a single person and only report your own income.
  • When you file your taxes together, you can choose to treat your non-resident alien spouse as a U.S. resident. This lets you file together, which usually means lower taxes and higher standard deductions. However, it also means that your spouse’s worldwide income must be reported to the IRS. This is a big choice that will have effects for a long time.

Talk to a professional about these choices, as they can have a big effect on how much tax you owe overall.

How to Figure Out Your Foreign Income and Deductions

  • Think about all the ways you make money from outside the U.S., not just your salary:
  • Income from renting out property in another country.
  • Capital gains come from selling things you own in other countries.
  • Investment income comes from dividends and interest earned on foreign accounts.

You need to report each type of income correctly, and you may be able to lower your tax bill by using the right deductions or credits. Also, be aware of deductions that can still help you as an expat, like those for moving costs (though they are now more limited), school costs, or even some home office deductions if you work for yourself. Knowing how your different sources of income affect U.S. tax law is very important.

If you’re reading this and realize you’ve already done one or more of these things wrong, what should you do? Don’t freak out. The IRS knows that it’s hard for expats to follow the tax rules, so they give taxpayers ways to do so without facing the worst penalties.

The IRS Amnesty Programs: Easier Ways to Follow Filing Rules

The Streamlined Filing Compliance Procedures are the most common and effective way for expats who don’t follow the rules to get back on track. This program is for taxpayers who didn’t follow the rules on purpose, which means they really didn’t know what they had to do or made a mistake.

You usually need to do the following to use the Streamlined Procedures:

  • Certify that you didn’t mean to break the rules. This is an important part, and it usually means writing a narrative statement about your situation.
  • Submit your last three years of U.S. tax returns (Form 1040) and your last six years of FBARs (FinCEN Form 114).
  • Pay any taxes, interest, and fines that are due. There is usually no FBAR penalty for expats who use the Streamlined Foreign Offshore Procedures.

This program is a lifeline that lets you catch up on your filing duties, report foreign financial accounts that you haven’t told anyone about, and pay any back taxes and interest that are due. This greatly lowers your risk of facing harsh penalties. However, it is strongly advised that you hire a professional to help you with this process because making mistakes while using the Streamlined Procedures can cause problems.

Important Things to Know for an Expat Life with Taxes

The expat life is an amazing journey, and knowing what taxes you have to pay doesn’t have to get in the way of the fun. Accept these basic ideas:

  • You have to file: No matter where you live or work, as a U.S. citizen, you always have to file a U.S. tax return.
  • Use your tools: The FEIE, FTC, and tax treaties are your main defenses against paying taxes twice.
  • You have to report foreign accounts and follow FBAR and FATCA rules.
  • Be proactive: Keeping good records and planning ahead are your best friends.
  • Get help: If you’re not sure what to do, talk to a qualified expat tax professional.

You can enjoy your life abroad with the peace of mind that your taxes are in order if you know these basics and stay away from common mistakes. This will free you up to focus on the things that make expat life so rewarding.

Share on social media
Facebook
Twitter
LinkedIn

Leave a Reply

Your email address will not be published. Required fields are marked *

How can we help you?

English • Portuguese • Spanish • German

Send us a message

Name
moving to portugal 2024
Your Visa Needs a Home — We Handle Both

Most Portuguese visas require proof of long-term accommodation — and that’s exactly where relocation plans often stall. Our bundled packages combine expert visa guidance with the right home to match, so your paperwork and your move happen in sync, not months apart. Choose the Visa Bundle, the Visa & Rental Bundle, or a full Buyer’s package — one team, start to finish.