Dual Citizenship: Which Countries Allow It in 2026 (and Which Don't)

Most of the world now permits dual citizenship. The United Kingdom, Ireland, the United States, Canada, Australia, France, Italy, Portugal, Türkiye and the Caribbean citizenship-by-investment states all allow it without restriction. A significant minority does not - India, China, Singapore, Malaysia, Indonesia and Japan require you to choose. A third group, including the UAE, Saudi Arabia and Egypt, permits it only by permission.

At a glance

• Dual citizenship means holding the nationality of two countries simultaneously, with the full rights and obligations of a citizen in each.
• The majority of countries permit it outright, including almost all of Western Europe, the Commonwealth's largest members and every Caribbean programme country.
• India and China do not permit it. Acquiring another nationality ends your original citizenship automatically, not after a hearing or a warning.
• India's OCI card is a lifelong visa and residency status. It is not citizenship, and it does not make you a dual national.
• A conditional middle group - the UAE, Saudi Arabia, Egypt, Pakistan and, historically, South Africa - permits dual nationality only with permission or within defined categories.

What is dual citizenship, exactly?

Dual citizenship is the legal status of being a citizen of two countries at the same time. You hold two passports and are entitled to live, work and vote in both according to each country's rules. It is a permanent legal relationship, not a visa - a distinction we set out in our guide to what a second passport is.

Crucially, no international treaty governs dual citizenship. Each country decides independently whether its own citizens may hold another nationality, and the two answers can differ. A Caribbean state may be content for you to hold its passport alongside your existing one, but if your country of origin prohibits dual nationality, its law still applies to you. In our advisory work, this is the first question we resolve.

Which countries allow dual citizenship in 2026?

The table below sets out the position of the countries we are asked about most often, current as of July 2026. Nationality law does change - the entries for Portugal, South Africa and Japan all reflect developments since 2025.

Why do India and China refuse - and what is the OCI card?

Neither of the world's two most populous countries permits dual citizenship. This matters enormously to the families we advise across the Gulf, East Africa and South Asia, because the assumption that a second passport simply sits alongside the first is, for them, wrong.

Under Indian law, an Indian citizen who voluntarily acquires another nationality ceases to be an Indian citizen at that moment. There is no application, no discretion and no grace period. The Indian passport must be surrendered, and continuing to use it after naturalising abroad carries penalties.

The Overseas Citizen of India card is what India offers instead, and it is widely misdescribed. OCI is a lifelong multiple-entry visa and residency status - it is not citizenship, and OCI holders are not dual nationals. It permits indefinite stay, work and study in India, but confers no Indian passport, no vote, no right to hold constitutional or government office and no right to buy agricultural or plantation land.

For most globally mobile Indian families, OCI is a workable settlement: it preserves practical access to India while a second citizenship provides the mobility they were seeking. But it should be chosen with clear eyes, not discovered afterwards. China's position is blunter still - Article 9 of its Nationality Law removes Chinese nationality automatically, and there is no OCI equivalent.

What happens if you acquire another nationality where it is prohibited?

Loss of the original citizenship is automatic and self-executing. It happens by operation of law at the moment the foreign nationality is acquired - not when a government notices, and not when you tell them. Travelling on the old passport then becomes unlawful use of a document you are no longer entitled to, renewals are refused, and property, inheritance and business rights reserved to citizens can be affected.

Where dual citizenship is permitted only with permission - as in Saudi Arabia and Egypt, and in a different form Pakistan - that permission must generally be sought before or shortly after acquiring the other nationality, not years later. Sequencing is part of the advice, and it is why we begin with your existing nationality rather than with a destination. For parents, the question extends a generation further, which we address in our guide to a second passport for your child's future.

Why do some people say dual citizenship is bad?

It is a fair question and deserves a straight answer. Dual citizenship carries real obligations, and for a minority of people those obligations outweigh the benefits.

• Tax and reporting. The United States taxes its citizens on worldwide income regardless of residence, and most countries now exchange financial account information automatically. A second citizenship does not erase reporting duties, and it can add them.
• Military service. Several countries impose national service on citizens living abroad. Acquiring a nationality can bring an obligation with it.
• Consular limits. When you are in a country of which you are a citizen, your other country of citizenship usually cannot intervene on your behalf. Dual nationality can narrow consular protection rather than double it.
• Renunciation costs. Where the original country prohibits dual nationality, giving it up involves fees, formal procedures and sometimes exit tax consequences.
• Administrative complexity. Two tax residencies and two sets of filings require ongoing management, particularly for business owners.

None of these is a reason to avoid a second citizenship. They are reasons to structure it properly. In our experience, difficulties arise almost exclusively where nationality was acquired without first mapping its interaction with the client's existing tax residence.

How do you get dual citizenship if your country allows it?

There are three legitimate routes, and no country grants citizenship instantly. Ancestry is the least expensive where it applies, and many people are eligible without knowing it - we cover this in our guide to citizenship by descent.

Naturalisation after a qualifying period of lawful residence is the most common route worldwide, and the reason residence-by-investment programmes matter even to families whose ultimate goal is a passport. Citizenship by investment is the fastest lawful route, typically months rather than years. The Caribbean programmes and Türkiye are the established options, compared in our guide to the easiest countries to get citizenship.

Frequently asked questions

Does the UK allow dual citizenship?

Yes. The United Kingdom places no restriction on dual or multiple citizenship. British citizens may acquire other nationalities without seeking permission, without notifying the Home Office and without any risk to their British status. The only constraint comes from the other country involved, since its law determines whether it permits its citizens to hold a second nationality.

Is OCI the same as dual citizenship?

No. Overseas Citizenship of India is a lifelong visa and residency status, not a nationality. OCI holders may live, work and study in India indefinitely, but they do not hold an Indian passport and cannot vote, stand for office or buy agricultural land. India's Constitution does not permit Indian and foreign citizenship simultaneously, and acquiring a foreign nationality ends Indian citizenship automatically.

Which countries do not allow dual citizenship in 2026?

As of July 2026, the countries most commonly asked about that prohibit dual citizenship include India, China, Singapore, Malaysia, Indonesia and Japan, whose Supreme Court upheld its ban in May 2025. Saudi Arabia, Egypt and the UAE permit it only in defined cases or with prior official permission, and Pakistan permits it only with a specified list of countries.

Will I lose my citizenship if I get a second passport?

Only if your country of origin prohibits dual nationality or requires permission you did not obtain. In prohibiting countries, loss is automatic at the moment the second nationality is acquired. In permitting countries, nothing happens at all. This is why the first step in any second-citizenship plan is confirming the rules of the nationality you already hold.

Can I hold three or more citizenships?

Yes, in countries that place no limit on multiple nationality, including the United Kingdom, Ireland, Canada, Australia and the United States. There is no international cap on the number of citizenships a person may hold. Each nationality carries its own obligations, however, so additional passports add administrative and potentially tax complexity rather than simply adding options.

Does the UAE allow dual citizenship?

Only in limited, defined circumstances. Emirati nationals may hold another nationality in specific cases, and foreign nationals naturalised under the nomination-based route introduced in 2021 may keep their original nationality. There is no open application route to Emirati citizenship. Most international families in the Emirates pursue long-term residence instead, through the UAE residence programmes.

Speak to Passport Legacy

Every second-citizenship plan begins with the nationality you already hold, because that is what determines which options are genuinely available to you. Our advisers assess your existing position, your family's circumstances and the sequencing required before any application is made. Contact us for a confidential consultation, or explore our citizenship by investment programmes to see the routes open to your family.