Dual citizenship between Canada and the United States is relatively common, as both countries allow their citizens to hold multiple nationalities. However, there is no single “dual citizenship application.” Instead, it occurs automatically when a person legally becomes a citizen of both countries under their respective laws.
For Americans who wish to obtain Canadian citizenship, the process typically begins with obtaining permanent residence in Canada through family sponsorship, employment, or other immigration programs. After living in Canada for at least three years within the last five, meeting language requirements, and passing a citizenship test, an applicant may apply for Canadian citizenship through Immigration, Refugees and Citizenship Canada (IRCC). Once approved and the Oath of Citizenship is taken, they will hold both U.S. and Canadian citizenships.
For Canadians who wish to become U.S. citizens, they must first obtain lawful permanent residence (“a green card”). This can be achieved through employment, marriage to a U.S. citizen, or other immigration categories. After maintaining permanent resident status and physical presence in the U.S. for the required number of years (usually five, or three if married to a U.S. citizen), a person can apply for U.S. naturalization through U.S. Citizenship and Immigration Services (USCIS). Upon approval, the individual must take the Oath of Allegiance to the United States. Although the U.S. Oath mentions renouncing prior allegiances, the U.S. government generally permits dual citizenship as long as the other country (in this case, Canada) does as well.
Both countries recognize that their citizens may owe duties to each nation, including taxation, jury duty, or military obligations. Dual citizens must therefore comply with the laws of both Canada and the United States. Additionally, dual citizens should use their Canadian passport to enter and leave Canada and their U.S. passport to enter and leave the United States. Dual nationality can offer significant benefits, such as freedom to live and work in both countries, but also potential complications—especially regarding taxes, as the U.S. taxes its citizens on worldwide income. Consulting an immigration lawyer or cross-border tax expert is advisable before or after obtaining dual citizenship between Canada and the U.S.