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.

For the narrower loss-of-nationality test, see whether getting a second citizenship affects US citizenship.

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.

Travel document rules remain separate. A US dual citizen must use a US passport to enter and leave the United States, while the other country may require its own passport at its border. See which passport a dual citizen should use and the related limits on US consular protection for dual citizens.

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 taxes its citizens on worldwide income regardless of where they reside. As a US citizen you generally must report worldwide income to the IRS when you meet the applicable filing requirements, regardless of where you live and regardless of how many other passports you hold. A second citizenship does not change that rule.

Several tools can reduce double taxation, but none applies automatically:

• The Foreign Earned Income Exclusion (FEIE) lets a qualifying American abroad exclude up to US$132,900 for tax year 2026 if the tax-home and physical-presence or bona-fide-residence requirements are met.
• 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.

These tools can reduce or eliminate additional US income tax in some cases, but the result depends on the income, residence country and treaty position. They do not automatically eliminate filing or information-reporting duties, and foreign pensions, companies, investment funds, capital gains and self-employment can create separate exposure. This is work for a cross-border tax professional, not a weekend.

Our dedicated guide to US dual-citizenship tax rules separates worldwide-income taxation, foreign tax credits, FBAR and FATCA.

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 small part. The serious part is the exit tax. For a 2026 expatriation, a person can be a covered expatriate by meeting any one of three tests: net worth of US$2 million or more, average annual net income-tax liability above US$211,000 for the prior five tax years, or failure to certify five years of federal tax compliance on Form 8854. Under the default mark-to-market rule, net unrealized gain above the US$910,000 2026 exclusion can be taxable, with separate rules for deferred compensation, specified tax-deferred accounts and trusts. Renunciation is serious, generally irrevocable, 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 can give an American the right to live, work, study or retire elsewhere, another travel document and a status that may extend to children. The practical gain depends on the second country and the family’s actual plans; a passport with overlapping travel access but no useful residence rights may add less than the marketing suggests.

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, client-paid investment-migration advisory and do not take commission from a program. Civita can structure the route comparison, reviewed entry-cash assumptions and questions that require licensed advice. It does not provide a US tax or legal opinion, and clients currently retain their own qualified cross-border tax and legal professionals for those conclusions.

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 with a qualified cross-border tax adviser before acting.