Dual citizenship: which countries allow it, and how it works (2026)
Two passports, twice the options — if you know the rules. Which countries allow dual citizenship, which don't, and how to get a second one.
Most countries — including the US, UK, Canada, Australia, Italy, Switzerland and, since 2024, Germany — allow dual citizenship. Some restrict it (Spain, the Netherlands) and a few forbid it (India, China, Singapore; Japan expects you to choose). The biggest catch is US citizenship-based taxation. You acquire a second passport by descent, naturalisation, marriage or investment.
What dual citizenship is
Dual (or multiple) citizenship means legally holding the nationality of two or more countries at once — each with its own passport, rights and obligations. Most people acquire it by descent, by naturalising after years of residence, by marriage, or by investment. Whether you're allowed to hold two depends on both countries' rules.
Why a second passport is worth having
A second nationality buys optionality: visa-free mobility, the right to live and work in another country or bloc (an EU passport covers 27 states), a place to go if things turn at home, and access to banking and business you'd otherwise be locked out of. For families it's a multi-generational asset.
The real costs and traps
The biggest one is tax. The United States taxes its citizens on worldwide income for life, so a US passport is a tax tie you carry everywhere — most countries instead tax on residence. Watch too for military-service obligations (e.g. Greece), renunciation requirements (Spain, the Netherlands, Singapore), and countries that forbid it outright (India, China), where naturalising abroad costs you your original nationality. Renouncing a citizenship to escape tax can itself trigger an exit tax.
Which countries allow dual citizenship?
| Country | Dual citizenship? | Note |
|---|---|---|
| The United States | Yes | but US citizens are taxed on worldwide income wherever they live. That's the real catch |
| The United Kingdom | Yes | the UK freely allows dual citizenship, with no need to renounce |
| Canada | Yes | Canada has allowed dual citizenship since 1977, with no catch to speak of |
| Australia | Yes | since 2002, Australia lets citizens hold other nationalities freely |
| Germany | Yes (since 2024) | since June 2024, Germany broadly allows multiple citizenship |
| Italy | Yes | Italy freely allows dual (and multiple) citizenship |
| Spain | Restricted | dual citizenship only with Ibero-American countries and a few others; otherwise you renounce |
| Switzerland | Yes | Switzerland has allowed dual citizenship without restriction since 1992 |
| The Netherlands | Restricted | the Netherlands generally makes you renounce, with notable exceptions |
| Mexico | Yes | Mexico has allowed dual nationality since 1998 |
| The Philippines | Yes (natural-born) | natural-born Filipinos can reacquire and keep Philippine citizenship (RA 9225) |
| India | No | India forbids dual citizenship. The OCI card is a lifelong visa, not a passport |
| China | No | China does not recognise dual nationality at all |
| Japan | No (choose by ~22) | Japan expects dual nationals to choose one nationality by around age 22 |
| Singapore | No | Singapore does not allow dual citizenship; you must choose by 21 |
Country guides: the US · the UK · Canada · Australia · Germany · Italy · Spain · Switzerland · the Netherlands · Mexico · the Philippines · India · China · Japan · Singapore.
How to get a second citizenship
Four main routes: descent (cheapest if you have the ancestry — see our citizenship by descent guide), naturalisation after tax residency, marriage, and investment (fast but costly — see cheapest citizenship by investment).
Where it fits in a borderless plan
A passport is one flag of several. Combine it with a low-tax residency and a self-custody plan for your Bitcoin, and see who this suits in our guide for investors.
Frequently asked questions
Which countries do not allow dual citizenship?
Notable ones that forbid or heavily restrict it include India and China (which don't recognise it at all), Japan and Singapore (which require choosing one nationality), and the Netherlands and Spain (which generally require renunciation, with exceptions).
Does dual citizenship mean paying tax twice?
Usually not — most countries tax on residence, and double-tax treaties prevent the same income being taxed twice. The big exception is the United States, which taxes its citizens on worldwide income wherever they live.
What's the easiest way to get a second citizenship?
If you have qualifying ancestry, citizenship by descent is cheapest. Otherwise, naturalisation after residence is the standard path, and citizenship by investment is the fastest — at a six- or seven-figure cost.
Can you hold three or more citizenships?
Yes, where each country permits it — 'dual' is shorthand for multiple. Some countries that allow dual nationality place no limit on the number you hold.
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