Americans planning a move abroad usually rank destinations on cost of living and healthcare. Both matter. But US citizenship-based taxation reshapes the ranking in ways that are counterintuitive, and it is worth understanding before choosing.
The rule that changes everything
The United States is one of very few countries that taxes on citizenship rather than residence. Moving abroad does not end your obligation to file a US return, and it never will unless you renounce.
Three obligations follow you:
Annual 1040 filing, whether or not you owe anything.
FBAR — FinCEN Form 114 — once your foreign accounts exceed $10,000 in aggregate at any point in the year. Combined across all accounts, not per account. Penalties for missing it are severe and the filing is free.
FATCA reporting on Form 8938 above higher thresholds, plus the knock-on effect that some foreign banks decline American clients rather than carry the reporting burden.
Why zero-tax countries are worse for Americans
This is the counterintuitive part.
Two mechanisms reduce double taxation: the Foreign Earned Income Exclusion, covering roughly the first $120,000 of earned income, and the Foreign Tax Credit, offsetting tax you paid abroad against your US bill.
In a high-tax country — Germany, Spain, Portugal — the foreign tax credit usually absorbs your entire US liability, because you paid more locally than you would have owed at home. The net effect is that you pay one country's tax, not two.
In a zero-tax country — the UAE, Qatar — there is no foreign tax to credit. Income above the FEIE threshold is taxed by the US at full rates. And passive income such as dividends, rental income and capital gains does not qualify for the FEIE at all.
So the tax-free salary that makes Dubai attractive to a Briton or a Canadian delivers substantially less to an American.
| Destination type | Effect for Americans |
|---|---|
| High-tax (DE, ES, PT, NL) | FTC usually cancels US liability |
| Moderate (MX, CR, TH) | Partial credit, some US tax above FEIE |
| Zero-tax (UAE, QA) | Full US tax above FEIE, no credit |
| Territorial (CR, PA, TH) | Foreign income often untaxed locally, US tax still applies |
Where Americans actually go
Mexico is by far the largest destination, and for good reasons beyond proximity: temporary residency is attainable on income or savings, healthcare is good and cheap, the time zones align for remote work, and flights home are short and frequent. Mexico City, Guadalajara, Mérida, Querétaro and San Miguel de Allende hold the largest communities.
Portugal — the D7 threshold is low, the citizenship path is five years, and the community is large. The NHR tax regime that drove much of the boom closed to new applicants at the end of 2023, so the financial case is weaker than older articles claim.
Costa Rica and Panama — low pension thresholds, territorial taxation, established American communities, and Panama uses the US dollar.
Spain — attractive but note the wealth tax in most regions, the Modelo 720 asset declaration, and a ten-year citizenship path that generally requires renouncing US citizenship to complete.
Thailand — very low cost, excellent private healthcare, but no meaningful path to permanent status or citizenship, and the 2024 change to foreign income remittance rules closed a common planning route.
Practical steps that save trouble
Keep a US bank account and a US address of record. Many US financial institutions restrict or close accounts for customers with foreign addresses, and brokerages in particular can bar trading. A family member's address is the usual workaround, though it should be genuine enough to withstand scrutiny.
Open the foreign account before you need it. Expect FATCA friction and allow weeks.
Use an accountant who handles expatriate returns, at least for the first year. The interaction between FEIE, foreign tax credits, treaty positions and state tax residency is where mistakes are expensive.
Check your state. Some US states are aggressive about continued residency claims after a move abroad, and severing state residence is a separate exercise from the federal position.