Two Passports, One Taxman: Dual Citizenship in the Crosshairs
What the new ‘exclusive citizenship’ bill doesn’t change (yet) about worldwide taxation, FBAR, and FATCA for Americans abroad.
U.S. citizenship and passports are having a moment again—and not in a calm, “let’s review our estate plan” way. A new Senate proposal, the Exclusive Citizenship Act of 2025, has people asking whether dual citizenship is about to be banned and if they need to choose a side.
For globally mobile families, none of this is happening in a vacuum. The existing rules on worldwide taxation, FBAR, and FATCA are already shaping how you bank, invest, and move—even if you’ve never set foot in a U.S. embassy to talk about renouncing anything.
This piece separates the political noise from the legal reality, then walks through what actually matters right now for U.S. citizens, green card holders, and other U.S. tax residents who also have a life (and assets) elsewhere.
The New Anti–Dual Citizenship Bill:What It Is & What It Isn’t?
In late 2025, Senator Bernie Moreno (R‑OH) introduced the “Exclusive Citizenship Act of 2025,” a bill that would effectively outlaw dual citizenship for Americans. The proposal has generated a lot of anxiety among dual nationals and long‑term expats, who are already grappling with complex U.S. tax and reporting rules.
At the same time, it has prompted a rush of misinformation—especially about what U.S. dual citizens “have to do now.”
This piece walks through two separate layers:
The citizenship conversation: what the Exclusive Citizenship Act would do if it ever became law.
The tax reality: the filing and foreign asset reporting rules that already apply today to U.S. citizens, green card holders, and tax residents—whether or not they are dual citizens.
1. What the Exclusive Citizenship Act Would Do
The Exclusive Citizenship Act of 2025 (S.3283) would mark a radical departure from decades of U.S. policy that has tolerated, and in practice normalized, dual nationality.
Under the bill, three core ideas stand out:
No more dual nationals going forward. It would be unlawful to hold U.S. and foreign citizenship simultaneously; voluntarily acquiring a foreign citizenship after the effective date would be treated as an automatic relinquishment of U.S. citizenship.
Forced choice for existing dual citizens. Current dual nationals would have to “pick a side” within a defined window (early summaries suggest one year): either renounce their foreign citizenship or be deemed to have voluntarily relinquished U.S. citizenship if they fail to act.
Automatic loss of citizenship by inaction. The structure of the bill tries to sidestep existing constitutional and statutory protections by deeming non‑response as “voluntary” loss of U.S. citizenship.
At the moment, the bill has been introduced and referred to committee, but it has not passed either chamber and has not been signed into law.
Many immigration and constitutional commentators view it as constitutionally suspect and practically unworkable, especially given the scale of the U.S. dual‑national population and existing backlogs in loss‑of‑nationality processing.
Key point for readers: dual citizenship remains legal today. There is no operative deadline, no requirement to choose, and no change to existing tax or reporting rules at this time.
2. Citizenship vs. Tax Status: Different Questions
The U.S. runs two related but distinct systems:
Nationality law (who is a U.S. citizen), and
Tax law (who is a U.S. tax “person” and what must they report).
The Moreno bill aims at nationality law. The day‑to‑day pain most expats feel comes from tax law and information reporting, which already apply regardless of whether someone is “only” American or a dual citizen.
For tax purposes, the important category is “U.S. person.” That bucket includes:
U.S. citizens, wherever they live.
Lawful permanent residents (green card holders), unless and until the green card is formally abandoned or revoked.
Non‑citizens who meet the substantial presence test in a given year.
If you are a U.S. person, you are subject to U.S. tax on your worldwide income and to the foreign asset reporting regimes discussed below—even if you also hold another passport, even if you have never lived in the United States as an adult, and even if your “other” country is where all of your income and assets sit.
If all you needed today was the sanity check—“Has dual citizenship been outlawed?”—the answer is still no.
But if you’re a U.S. citizen, green card holder, or U.S. tax resident with accounts, property, or pensions outside the U.S., the rules that already exist matter far more than any bill press release, so let’s look at what they actually require you to file and report now.
