Could you be a dual citizen of the US and Canada without realizing it?

The American Surprise

Many people spend years researching immigration law and applying for visas when, in fact, they may unknowingly already be entitled to a US passport. You could be one of them. Let’s take a moment here to explore your potential US citizenship rights a little further.

For example, most people assume that they can only become US citizens when they apply for naturalization and take the oath of allegiance. Not always. US citizenship can occur automatically in some cases. Perhaps you were born in the United States and left the country as an infant. Contrary to what you may have believed, living abroad for decades generally does not erase US citizenship.

Take another example. Perhaps your parents became US citizens while you were a child in their care and a lawful permanent resident. Under the right circumstances, you may have automatically become a US citizen and not realize it.

Or take another chance. Perhaps you were born outside the United States to American parents and thought that being born abroad disqualified you. Depending on the US law in effect at the time of your birth and your parent’s physical presence in the United States before you were born, you may already be a US citizen pursuant to law.

The difficulty is that Congress has repeatedly amended these rules over the past century. The applicable law is usually that which existed at the date of birth or naturalization. Determining eligibility often requires careful review of birth certificates, naturalization records, passports, marriage certificates, and immigration records. It is one of those areas where experienced legal advice is often essential and can save a huge amount of time and frustration.

Canada has created its own surprise

Let’s now consider Canadian citizenship for a minute. Recently, Canada has quietly opened up another remarkable opportunity. Could there be something for you under the new law?

After his passing Bill C-3 at the end of 2025, Canadian citizenship by descent has expanded dramatically. Today, many people born anywhere in the world may qualify for Canadian citizenship because of a Canadian ancestor.

For some, the connection is obvious — a Canadian parent. For applicants born before December 15, 2025, they may be a grandparent or even earlier direct ancestor who was born in Canada or became a Canadian citizen after 1947. In some cases, the reforms also address historical injustices that prevented citizenship from being passed down from previous generations. Legal rules remain technical and documentation is critical. But the essential question is surprisingly simple: Was one of your direct ancestors Canadian? If so, your family tree may contain something much more valuable than old photos. It may contain a Canadian passport for you and your children.

Because this matters

No government sells citizenship. If you qualify by birth or descent, you don’t buy it. You are simply asking your government to recognize a legal status that you already have. This distinction matters. A second citizenship in any country provides huge long-term advantages.

American citizenship offers unlimited access to the world’s largest economy, the right to live and work anywhere in the United States, sponsor family members, vote, hold many government positions, and travel with one of the world’s most powerful passports.

Canadian citizenship provides many of the same benefits, including the unlimited right to live and work anywhere in Canada, access to publicly funded health care once provincial residency requirements are met, free primary and secondary education at good schools, domestic university tuition, and a passport that is highly regarded and enjoys extensive visa-free travel.

Both countries recognize dual citizenship.

An American who qualifies for Canadian citizenship generally does not need to surrender a US passport. He can have both citizenships. Likewise, Canadians who normally acquire US citizenship can also retain Canadian citizenship. This is one of the most important benefits of claiming a lost legal inheritance. The most obvious example is the benefit for students who do not have to pay international tuition fees while attending college or university without compromising their current legal status in their home country.

Every legacy has obligations

Of course, legacies rarely come without conditions. Citizenship also carries obligations.

An example has to do with taxation. The United States is unusual in this regard because it taxes its citizens on worldwide income, regardless of where they live. For example, this reality surprised former British Prime Minister Boris Johnson.

Born in New York while his father was studying there, Johnson considered himself thoroughly British. Decades later, after selling his London home while living in England, he received an unexpected US tax bill because the United States still considered him one of its citizens. He eventually paid the tax and then renounced his US citizenship to avoid any further tax surprises.

Canada generally taxes based on residence rather than citizenship, making Canadian tax consequences significantly different. However, tax planning for those operating in this second citizenship area is essential. The lesson is simple. Before celebrating a newly discovered citizenship, understand both the rights and responsibilities that come with it. Legal and tax advice is critical.

You can also leave

No country compels a person to remain a citizen forever. Indeed, both the United States and Canada allow voluntary resignation.

The process is deliberately serious. The decision must be voluntary, informed and free of coercion. Governments generally wish to avoid leaving someone stateless, that is, without the citizenship of any country. Nor should the waiver be made simply as a means of evading tax or other legal obligations. Relinquishing citizenship means relinquishing valuable rights that may benefit not only you but future generations of your family. So it is not a decision to be taken lightly, but one that would benefit from legal advice and some guidance.

Look at your family tree

To reiterate, most people believe that citizenship begins with an application. But sometimes it starts with opening an old family photo album. An ancestor’s birthplace can be worth much more than a genealogical curiosity. It can represent the legal right to live, work and build a future elsewhere in North America if they want or need to. Like a windfall, citizenship by descent and dual citizenship are not available to everyone. But for those who qualify, it can turn out to be one of the most valuable family heirlooms they never knew they had. For those who believe they may have a chance at second citizenship, a consultation with a qualified legal advisor may be the best next step.