When the IRS Follows You Overseas: The Tax Mistakes Americans Abroad Make (And Regret for Years)

Picture this: you've been living your best life in Lisbon for three years. You've got a routine, a favorite café, maybe even a local gym. Life is genuinely good. Then you get an email from a tax attorney back in the States, and suddenly your carefully built abroad-life starts looking a lot more fragile.

This isn't a hypothetical. It's a scenario that plays out more often than you'd think — and it's almost always preventable.

The United States is one of only two countries in the world (the other being Eritrea) that taxes its citizens based on citizenship rather than residency. That means whether you're sipping espresso in Rome or running a surf school in Bali, Uncle Sam still expects a tax return every single year. Most Americans know this in theory. The problem is the details — and the details are where the expensive mistakes live.

The FBAR Filing That People Forget Until It's Way Too Late

Let's start with the one that catches people completely off guard: the FBAR, or Foreign Bank Account Report. If you have a foreign bank account — and if you live abroad, you almost certainly do — and the aggregate balance across all your foreign accounts exceeds $10,000 at any point during the calendar year, you're required to file a FinCEN Form 114 with the Financial Crimes Enforcement Network.

Not with your tax return. Separately. Through a different government portal. By April 15th (with an automatic extension to October 15th).

The penalty for willfully failing to file? Up to $100,000 per violation — or 50% of the account balance, whichever is greater. Even non-willful violations carry fines of up to $10,000 per year.

Take the case of Marcus, a software developer from Austin who spent four years working remotely from Southeast Asia. He knew he owed taxes. He filed every year. But he had no idea the FBAR existed until year three, when a fellow expat mentioned it at a co-working space in Chiang Mai. He ended up using the IRS's Streamlined Foreign Offshore Procedures — a program designed for non-willful non-compliance — to get caught up without facing the full penalty structure. He got lucky. Not everyone does.

The State That Won't Let You Go

Here's something a lot of people miss entirely: moving abroad doesn't automatically sever your tax relationship with your home state. California, New York, Virginia, and South Carolina are notorious for aggressively pursuing former residents who they believe haven't truly established domicile elsewhere.

California in particular operates on a "presumption of residency" standard that can feel almost impossible to shake. If you kept a storage unit there, maintained a California driver's license, or even just had a gym membership, the Franchise Tax Board may still consider you a resident — and tax you accordingly.

Jamie, a freelance writer from San Francisco who relocated to Mexico City, assumed that canceling her lease was enough to break California residency. It wasn't. After two years abroad, she received a notice from the FTB asserting she owed back taxes on her foreign income. She eventually resolved it, but it cost her thousands in back payments and accounting fees she hadn't budgeted for.

The fix? Before you leave, consult a tax professional who specializes in expat issues. Formally establish residency in a state with no income tax — like Florida, Texas, or Nevada — before you go. Get a new driver's license. Close accounts. Make the break clean and documented.

The Foreign Earned Income Exclusion Isn't Automatic

The Foreign Earned Income Exclusion (FEIE) is one of the most valuable tools available to Americans living abroad. For 2024, it allows you to exclude up to $126,500 of foreign-earned income from US federal taxes. That's significant. But you have to claim it — it doesn't apply automatically.

To qualify, you need to meet either the Bona Fide Residence Test (you've been a legitimate resident of a foreign country for a full tax year) or the Physical Presence Test (you've been outside the US for at least 330 full days in a 12-month period). You also need to file Form 2555.

The mistake people make? Assuming that because they qualify, they're covered — without actually filing the form. Or worse, assuming the exclusion covers everything, including self-employment taxes. It doesn't. Even with the FEIE, you may still owe self-employment tax on your net earnings.

A Checklist Before You File From Abroad

If you're currently living outside the US or planning to, run through this every tax season:

• File your federal return. Even if you owe nothing, you likely still need to file.
• Check your FBAR obligation. If any foreign account touched $10,000 at any point, file FinCEN 114 separately.
• Review FATCA requirements. If your foreign financial assets exceed $200,000 (single filer living abroad), you also need to file Form 8938 with your return.
• Claim the FEIE if you qualify — and actually attach Form 2555.
• Audit your state tax situation. Don't assume moving abroad automatically ended your state tax obligations.
• Track your days. If you're using the Physical Presence Test, document your travel carefully. Border crossing records can have gaps.
• Look into the Foreign Tax Credit. If you're paying taxes in your host country, you may be able to offset your US liability dollar-for-dollar.
• Don't forget retirement accounts. Contributions to foreign pension plans often aren't treated the same as a 401(k), and the rules vary wildly by country.

When to Stop DIYing It

There's a version of this where you use TurboTax and hope for the best. That version ends in one of two ways: fine, or very not fine. The stakes get higher the longer you live abroad, the more countries you move through, and the more complex your income streams become.

Expat-focused tax services like Greenback Tax Services, Bright!Tax, or Taxes for Expats exist specifically for this situation. Yes, they cost money. But a single missed FBAR filing can cost exponentially more. Think of it less like a fee and more like insurance on the life you've built.

Living abroad is one of the most rewarding things you can do. The freedom, the perspective, the sheer aliveness of navigating a world that doesn't look like the one you grew up in — it's genuinely hard to put a price on. But ignoring the financial and legal infrastructure that keeps your life running? That's the kind of mistake that follows you home.

Do the paperwork. Hire the professional. File the form. The adventure is absolutely worth it — just make sure the IRS agrees.