Dual Citizenship for US Citizens: The Rules, the Tax Trap, and What to Know in 2026

Yes, US citizens can hold dual citizenship. That part is simple and settled. What is not simple, and what almost every short answer leaves out, is the tax and reporting machinery that follows a US passport no matter how many other passports you hold. If you are an American thinking about a second citizenship, the citizenship question is the easy half. The US-specific obligations are the half that needs planning. This guide covers both, accurately and without the usual oversimplifications.

For the bigger picture on how dual citizenship works generally, start with our complete guide to dual citizenship. This piece is the part that applies specifically to Americans.

US law permits dual citizenship and does not make you choose

The State Department is explicit: US law does not require a citizen to choose between US citizenship and another nationality, and it does not impede its citizens’ acquisition of a foreign citizenship. You can naturalize abroad, or be born with two nationalities, and remain fully American.

This is backed by the Supreme Court. In Afroyim v. Rusk (1967), the Court held that a US citizen cannot be involuntarily stripped of citizenship. In Vance v. Terrazas (1980), it held that the government must prove you acted with the intent to give up your US nationality. Acquiring a foreign citizenship is not, by itself, enough to lose your American one. The US does say it does not encourage dual nationality as a matter of policy, because it can complicate consular protection, but recognizing it and discouraging it are different things, and the law recognizes it.

The oath myth

Here is the point that confuses people. The Oath of Allegiance taken at naturalization includes language in which the new citizen renounces allegiance to foreign states. Read literally, that sounds like you must give up your old citizenship. In practice you do not. The US does not require new citizens to surrender their prior passport, and as above, US law does not require choosing between nationalities.

Whether you actually keep your original citizenship turns on that country’s law, not the US oath. Many countries do not treat the US oath as a legal act of renunciation, so their citizens who naturalize as American remain their citizens too. The oath is a statement of allegiance to the United States. It does not, by itself, end a foreign nationality.

How a US citizen would actually lose citizenship

You do not lose US citizenship by accident. Under the Immigration and Nationality Act (8 USC 1481), there are specific potentially expatriating acts, such as formally renouncing before a US consular officer, or naturalizing in a foreign state. But they only cause loss of citizenship if performed voluntarily and with the intent to relinquish US nationality. Intent is the decisive element, and the government has to establish it. In short: getting a second passport does not put your US citizenship at risk unless you set out to give it up.

The real catch: the US taxes you on worldwide income

This is the part to understand before anything else. The United States is one of the only countries on earth that taxes based on citizenship, not residence. As a US citizen you must report your worldwide income to the IRS every year you exceed the filing threshold, regardless of where you live and regardless of how many other passports you hold. A second citizenship does not reduce this. It does not change it at all.

The good news is that double taxation is almost always preventable, just not automatically:

• The Foreign Earned Income Exclusion (FEIE) lets a qualifying American abroad exclude a large band of earned income, up to US$130,000 for tax year 2025 (rising to about US$132,900 for 2026), if you meet the physical presence or bona fide residence test.
• The Foreign Tax Credit gives a dollar-for-dollar credit for income tax you pay to another country.
• Tax treaties with more than sixty countries allocate taxing rights and resolve dual residence.

Used well, these usually eliminate any actual US tax bill for Americans living abroad. But the filing obligation remains every year, the rules are genuinely complex, and edge cases such as foreign pensions, certain capital gains, and self-employment can still leave residual exposure. This is work for a cross-border tax professional, not a weekend.

FBAR and FATCA: the reporting most people miss

Beyond the tax return itself, two reporting regimes catch dual citizens off guard. They are different, and conflating them is the classic mistake.

• FBAR (FinCEN Form 114) is filed with FinCEN, not the IRS, and is separate from your tax return. You must file it if the combined value of your foreign financial accounts exceeded US$10,000 at any point in the year, even for one day. The threshold is low and the penalties for missing it are severe.
• FATCA (Form 8938) is filed with your tax return and reports specified foreign financial assets above thresholds that depend on where you live and your filing status (for a single filer living abroad, more than US$200,000 at year-end). FATCA also pushes many foreign banks to report, or simply refuse, US-citizen account holders, which is a real practical friction of carrying a US passport abroad.

Renouncing, and the exit tax

Some Americans eventually consider renouncing US citizenship to escape citizenship-based taxation. Two things to know.

First, the fee dropped. The State Department reduced the renunciation fee from US$2,350 to US$450, effective 13 April 2026. Most content still quotes the old figure.

Second, the fee is the trivial part. The serious part is the exit tax. If you are a covered expatriate, broadly meaning a net worth of US$2 million or more (a figure that is not inflation-adjusted), or a high average annual income tax liability (about US$206,000 for 2025), or you fail to certify five years of tax compliance on Form 8854, then renouncing is treated as if you sold your worldwide property at fair market value the day before you left, with the net gain above an annual exclusion (US$890,000 for 2025) taxed. Renunciation is serious, largely irreversible, and a decision to make only with proper cross-border tax planning.

So why do Americans still get second citizenships?

Because for most people the goal is not to renounce. It is optionality. A second citizenship gives an American a genuine Plan B: the right to live, work, study, or retire elsewhere, a stronger travel document, and a hedge that often extends to their children. The US passport now ranks around tenth globally for visa-free access, so a well-chosen second passport can be a real upgrade. Grenada is frequently of interest to Americans specifically, because Grenadian citizenship can open the door to the US E-2 investor visa through a treaty, useful in the other direction for non-US spouses and business plans.

The honest framing is this: a second citizenship adds rights and options. For an American, it does not subtract US tax and reporting obligations. Plan for both sides, and it is a strong move. Ignore the tax side, and it becomes an expensive surprise.

Where Civita fits

We are an independent, fee-only investment-migration advisory. We do not take commission from any program, so our recommendation is not for sale, and we coordinate the cross-border tax and legal professionals who handle the parts that need a license. If you are an American weighing a second citizenship, a Program-Fit Report lays out which routes actually fit your situation, the all-in cost, and the US tax considerations specific to you, before you commit to anything.

This guide is general information as of 2026, not tax or legal advice. US tax figures are inflation-indexed and change yearly, so verify the current numbers, and speak with us and a qualified cross-border tax adviser before acting.