The United States and Canada both allow their citizens to hold a second nationality, so U.S.-Canadian dual citizenship simply means being a full citizen of both countries at the same time, with all the rights and all the obligations of each. Neither government requires you to choose. The U.S. Supreme Court held in Afroyim v. Rusk that Congress cannot strip citizenship without a person’s voluntary consent, which protects Americans who acquire a foreign nationality.1Justia U.S. Supreme Court Center. Afroyim v. Rusk 387 U.S. 253 (1967) Canada made dual citizenship explicit in its 1977 Citizenship Act, reversing the older rule that Canadians lost their nationality on becoming citizens elsewhere.2Government of Canada Publications. Canadian Citizenship Act and Current Issues (BP-445E)
How People End Up With Both Citizenships
Three routes cover almost everyone: birth on one country’s soil to parents who are citizens of the other, inheritance from a parent, or adult naturalization.
Both countries grant automatic citizenship to anyone born on their territory. A child born in Toronto to American parents is Canadian by birth and American through the parents; a child born in Chicago to Canadian parents is the reverse. Children born outside both countries can inherit citizenship, but Canada limits how far descent extends. A Canadian citizen who was themselves born outside Canada can only pass citizenship to a child born abroad if the parent lived in Canada for at least 1,095 cumulative days before the child’s birth. The U.S. imposes its own residency requirements on the American parent, and these vary depending on whether one or both parents are U.S. citizens.
Adults who weren’t born into dual status go through permanent residency followed by naturalization in the second country. Canada requires permanent residents to have been physically present in the country for at least 1,095 days during the five years before applying.3Immigration, Refugees and Citizenship Canada. Canadian Citizenship for Adults and Minor Children: Who Can Apply The United States requires at least 30 months of physical presence during the five years before applying.4U.S. Citizenship and Immigration Services. Volume 12 – Part D – Chapter 4 – Physical Presence Neither country requires you to give up your existing citizenship when you naturalize, which is how most adult dual nationals are made.
Language and Civics Testing
Both countries want to see that you can communicate in an official language and that you know something about how the country works.
The U.S. Test
U.S. applicants must read, write, speak, and understand English at an everyday level, which the USCIS officer evaluates during the interview. Applicants who file on or after October 20, 2025, take the 2025 civics test: 20 questions drawn from a bank of 128, with a passing score of 12 correct.5U.S. Citizenship and Immigration Services. Chapter 2 – English and Civics Testing
Older long-term residents get breaks. Applicants who are 50 or older with at least 20 years of permanent residency, or 55 or older with at least 15 years, can skip the English portion and take civics in their preferred language through an interpreter. Applicants 65 and older with 20 years of residency take a simplified 10-question civics test from a shorter study list, passing with six correct.5U.S. Citizenship and Immigration Services. Chapter 2 – English and Civics Testing
The Canadian Test
Canada requires proof of English or French at Canadian Language Benchmarks level 4 or higher in listening and speaking. Accepted proof includes standardized test scores (CELPIP, IELTS General Training, or TEF for French), a diploma from a program taught in English or French, or certificates from government-funded language training. Only applicants between 18 and 54 on the date of application need to provide language proof. The knowledge test covers Canadian history, geography, government, laws, and symbols, and the study guide is called Discover Canada.6Immigration, Refugees and Citizenship Canada. Citizenship Test: Study for the Test
Applying and Paying
United States
The primary form is the N-400, Application for Naturalization. Expect to document your employment history and every international trip from the past five years. The filing fee is $710 online or $760 on paper. Applicants with household income at or below 150% of the federal poverty guidelines can request a reduced fee of $380.7U.S. Citizenship and Immigration Services. N-400, Application for Naturalization USCIS processes the application, takes fingerprints for a background check, and calls you in for an interview covering your application, English, and civics. Passing leads to the Oath of Citizenship ceremony, which is the moment you legally become a U.S. citizen.
Canada
Most adult applicants apply online through the IRCC portal, though some situations still require the paper form CIT 0002.8Immigration, Refugees and Citizenship Canada. Apply for Canadian Citizenship Online The application asks for residential addresses, travel history, and proof that you’ve filed Canadian income taxes for the years counting toward your residency requirement. You’ll also submit your birth certificate, permanent resident card, and government-issued ID.9Immigration, Refugees and Citizenship Canada. Canadian Citizenship for Adults: Forms and Documents to Apply on Paper
The total adult fee is $649.75, covering processing and the right-of-citizenship fee, and is scheduled to rise after March 31, 2026.10Immigration, Refugees and Citizenship Canada. Citizenship and Immigration Application Fees: Fee List After processing you take the knowledge test, and passing brings an invitation to the Oath of Citizenship ceremony.
Traveling With Two Passports
Federal law makes it illegal for a U.S. citizen to enter or leave the United States without a valid U.S. passport.11Office of the Law Revision Counsel. 8 U.S. Code 1185 – Travel Control of Citizens and Aliens Canada applies the same principle to its citizens. In practice, dual citizens carry both passports: show your Canadian passport to Canadian officials and your U.S. passport to American officials. Airlines flying to either country check for the correct passport at boarding.
Once you’re inside either country, that government treats you as its own citizen only. If you have legal trouble in Canada, U.S. embassy assistance is limited because Canada considers you Canadian first, and the same holds in reverse. In a third country, you can seek consular help from whichever embassy is more accessible.12U.S. Department of State. Dual Nationality
The Tax Situation Is the Hard Part
This is where dual citizenship gets complicated and where the most expensive mistakes happen. The United States is one of the few countries that taxes based on citizenship rather than residency. If you’re an American citizen living in Canada, you owe the IRS an annual tax return reporting your worldwide income. Canada taxes its residents on worldwide income too. So a dual citizen living in Canada files in both countries every year.
FBAR and FATCA Reporting
If your foreign financial accounts (from the U.S. perspective, every Canadian bank account, investment account, and registered plan counts) exceed $10,000 in aggregate value at any point during the year, you must file a Report of Foreign Bank and Financial Accounts with the Financial Crimes Enforcement Network.13Internal Revenue Service. Report of Foreign Bank and Financial Accounts (FBAR) It’s separate from your tax return with its own deadline.
Form 8938, from the Foreign Account Tax Compliance Act, is a second report with higher thresholds that depend on where you live. A dual citizen living in Canada filing individually must report specified foreign financial assets if the total exceeds $200,000 on the last day of the tax year or $300,000 at any point during the year. Joint filers living abroad face thresholds of $400,000 and $600,000.14Internal Revenue Service. Do I Need to File Form 8938, Statement of Specified Foreign Financial Assets
Penalties for ignoring these filings are steep. A non-willful FBAR violation can cost up to $10,000 per account per year. A willful violation carries a penalty of up to 50% of the highest account balance during the year or $100,000, whichever is greater.15IRS Taxpayer Advocate Service. Modify the Definition of Willful for Purposes of Finding FBAR Violations These accumulate across accounts and years.
Avoiding Double Taxation
The U.S.-Canada Income Tax Convention addresses dual citizens directly. Under Article XXIV, a U.S. citizen living in Canada gets a credit against Canadian tax for U.S. taxes paid, and then a credit against U.S. tax for Canadian taxes paid after that adjustment.16Internal Revenue Service. United States – Canada Income Tax Convention The practical result is that you generally pay the higher of the two countries’ rates rather than both stacked.
Two IRS provisions do most of the work. The Foreign Tax Credit, claimed on Form 1116, offsets your U.S. tax dollar-for-dollar against Canadian income taxes paid.17Internal Revenue Service. Foreign Tax Credit Because Canadian tax rates are generally higher than U.S. rates, many dual citizens in Canada find the credit wipes out most or all of their U.S. liability. The Foreign Earned Income Exclusion is an alternative, letting qualifying taxpayers abroad exclude up to $132,900 of earned income from U.S. taxation in 2026.18Internal Revenue Service. Figuring the Foreign Earned Income Exclusion You can’t apply both to the same income. Which saves more depends on your situation.
The filing obligation stands whether or not you owe anything. If the credit zeroes out your U.S. bill, you still submit the return.
Combining Work Credits Across Systems
Dual citizens who have worked in both countries benefit from the U.S.-Canada Totalization Agreement. If you don’t have enough work credits under one country’s system to qualify for retirement, disability, or survivor benefits, you can combine credits from both to meet the threshold. To use Canadian credits toward a U.S. Social Security benefit, you need at least six U.S. work credits (roughly 18 months of covered employment). To use U.S. credits toward Canada Pension Plan benefits, you need at least one year of CPP contributions.19Social Security Administration. Totalization Agreement with Canada
The agreement also stops you from paying Social Security and CPP taxes on the same earnings. Self-employed workers pay into the system of the country where they live. Employees posted abroad by their employer generally stay on their home country’s system for a defined period.
Selective Service for Men
Male dual nationals between 18 and 25 must register with the U.S. Selective Service System within 30 days of their 18th birthday, whether they live in the United States or Canada.20Selective Service System. Who Needs to Register Registration is available online with a foreign address. Failing to register is technically a felony, but the practical consequences are worse for most people: disqualification from federal employment, federal student financial aid, and job training programs, with unregistered immigrant men potentially denied U.S. citizenship altogether.21Selective Service System. Benefits and Penalties Dual citizens who grew up in Canada often don’t realize this applies to them.
Losing or Giving Up Citizenship
Dual citizenship is stable as long as you don’t take certain deliberate actions. Under U.S. law, you can lose your nationality by voluntarily performing specific acts with the intent to give it up: naturalizing in a foreign country, swearing allegiance to a foreign government, serving as an officer in a foreign military, or committing treason.22Office of the Law Revision Counsel. 8 USC 1481 – Loss of Nationality by Native-Born or Naturalized Citizen The word that matters is “voluntarily.” Becoming a Canadian citizen doesn’t automatically end U.S. nationality because the State Department presumes you intend to keep both unless you say otherwise. Serving as a commissioned officer in the Canadian military is a listed act, and someone who did so with a stated intention to abandon U.S. citizenship could lose it.
Canada’s rules are simpler: you lose Canadian citizenship only by formally renouncing it or if your grant is revoked for fraud.
Renouncing U.S. Citizenship
A dual citizen who decides to give up American nationality must appear in person at a U.S. embassy or consulate abroad and formally renounce. The administrative fee dropped from $2,350 to $450, effective April 13, 2026.23Federal Register. Schedule of Fees for Consular Services – Fee for Administrative Processing of Request for Certificate of Loss of Nationality of the United States The fee is only part of the cost. Former citizens whose net worth exceeds $2 million or who have a significant unpaid tax liability may face an expatriation tax that treats all worldwide assets as if sold on the day before renunciation, with gains above an inflation-adjusted exclusion taxed at regular capital gains rates. The exit tax exists to prevent renunciation as a way to escape a large tax bill.
Even after renouncing, you file a final U.S. tax return and Form 8854, the expatriation information statement, for the year you give up citizenship.