What Americans Moving to Panama Often Get Wrong

Many Americans living abroad assume that once they move overseas, their US tax life becomes simpler. They pay tax in the country where they now live, earn income from a foreign employer or foreign clients, and may not have returned to the United States for years.

But US expat taxes often work differently from what people expect. For Americans abroad, the issue is not always whether they owe a large US tax bill. The bigger risk is failing to file, missing foreign account reporting rules, or assuming that local tax compliance automatically satisfies the IRS.

The United States is unusual because it generally taxes citizens on worldwide income, even when they live abroad. That means income earned in the UK, Portugal, Mexico, Canada, or the UAE may still need to be reported on a US tax return.

This surprises many people because it feels counterintuitive. If your salary is paid overseas, your apartment is overseas, and your daily life is overseas, why should the IRS still be involved?

The answer is that citizenship, not only residence, matters for US tax purposes.

That does not mean every American abroad pays tax twice. Many expats can reduce or eliminate US tax through the Foreign Earned Income Exclusion, the Foreign Tax Credit, or treaty-based positions. But these benefits usually need to be claimed correctly. They are not automatic simply because someone lives outside the United States.

A common example is an American founder who sells part of a company, relocates to Portugal, and keeps investment accounts across the US and Europe. From a lifestyle point of view, his financial life may now feel international. From a US tax point of view, the picture can become more complicated, not less. He may need to report foreign accounts, review capital gains exposure, understand how foreign tax credits apply, and check whether his former US state still considers him connected. For high-net-worth Americans abroad, the risk is often not one missed salary form — it is the combination of equity, investments, bank accounts, residency ties, and timing.

Another American in the UK may owe little or no US tax after claiming credits for UK taxes paid. But if he assumes “no tax due” means “no filing required,” he may still fall behind on IRS paperwork.

That distinction matters: filing and paying are not the same thing.

Foreign bank account reporting is another area where expats get caught by surprise. The FBAR rule can apply when the total value of foreign financial accounts exceeds $10,000 at any point during the year. This is not only about wealthy taxpayers. A checking account, savings account, and joint household account can cross the threshold quickly, especially during relocation.

Some expats may also need to consider FATCA reporting for foreign financial assets. FBAR and FATCA are related, but they are not the same form. Missing one because you filed the other is a common misunderstanding.

State tax can create another hidden problem. Moving abroad does not always end ties to a former US state. If someone keeps a home, driver’s license, voter registration, business connection, or strong financial ties in a state, that state may still question whether residency has truly ended. This is especially important for people leaving high-tax states.

The most common mistakes are usually simple ones. Many Americans assume foreign taxes replace US filing. They do not. Others assume only US-source income matters. For citizens abroad, worldwide income is usually relevant. Some believe small foreign accounts are not worth reporting, even when the combined balance crosses the threshold. Others wait until a move, marriage, business launch, or property sale creates a more complicated tax situation.

The better approach is to review the basics before there is a problem. Americans abroad should know where they were tax resident during the year, how many days they spent in each country, what income they earned, which foreign taxes they paid, and whether they held foreign bank or investment accounts.

They should also understand which strategy fits their situation. The Foreign Earned Income Exclusion may help some expats exclude earned income up to an annual limit. The Foreign Tax Credit may work better for people living in higher-tax countries. Self-employed Americans may need a different review than employees. Retirees, investors, founders, and remote workers can all face different reporting issues.

For Americans who are unsure which rules apply to them, it helps to start with a structured checklist rather than guess from scattered advice. Flamingo Compliance explains the main filing rules, deadlines, exclusions, credits, FBAR, FATCA, and common mistakes in its full 2026 guide to US expat taxes for Americans living abroad.

The key takeaway is straightforward: moving abroad does not automatically end US tax responsibilities. But it also does not automatically mean being taxed twice. For most Americans overseas, the goal is to file correctly, claim the right relief, and avoid preventable reporting mistakes before they become expensive.