Does Getting Canadian Citizenship Affect Your US Citizenship?

Getting Canadian citizenship by descent does not affect your US citizenship. You will not lose it, you will not have to choose between the two, and nothing about the CIT 0001 process creates a legal risk to your American status. Both countries permit dual citizenship, and for the specific path under Bill C-3, there is not even a mechanism by which US citizenship could be jeopardized.

Here is the legal framework behind that answer.

The CIT 0001 process does not involve naturalization. You are not applying to become Canadian. You are asking IRCC to issue a certificate confirming citizenship you already hold by descent under the Citizenship Act as amended by Bill C-3. There is no ceremony, no oath of allegiance, and no moment where you formally acquire a new nationality. You present documents proving a direct ancestry chain to a Canadian-born ancestor, pay a $75 CAD government fee, and receive a certificate confirming status that existed from birth.

US law uses the term "expatriating acts" to describe the specific actions that can, under narrow circumstances, lead to loss of US citizenship. These are defined in 8 U.S.C. § 1481 and include things like taking an oath of allegiance to a foreign government, serving in a foreign military hostile to the US, and formally renouncing citizenship at a US consulate. Receiving a citizenship certificate that confirms existing status by descent is not on the list.

Even if you were naturalizing as Canadian, not just confirming descent, US law does not automatically strip citizenship. Since *Vance v. Terrazas* (1980), the Supreme Court has held that losing US citizenship requires two elements: a voluntary expatriating act AND a demonstrated intent to relinquish citizenship. The government bears the burden of proving both by a preponderance of the evidence.

The State Department's position, codified in 7 FAM 080, reinforces this in practice. The official policy is that US citizens who take a routine oath of allegiance to a foreign country will be presumed to have done so with intent to retain their US citizenship, not relinquish it. The presumption is rebuttable only if you explicitly manifest an intent to surrender American status, for example by telling a consular officer you intend to give up your US citizenship.

For citizenship by descent, there is no oath at all. The presumption does not even come into play.

Naturalization in Canada requires an oath of citizenship. Citizenship by descent does not. CIT 0001 applicants are confirming status they already hold, not naturalizing, so no oath is required or administered at any point in the process. If you were later to naturalize in Canada as a separate matter, the standard Canadian citizenship oath pledges loyalty to the King of Canada and the laws of Canada. Under the State Department's intent-to-retain presumption, taking that oath would not automatically cost you US citizenship unless you simultaneously declared your intention to give it up.

For descent applicants, this question does not arise.

No. There is no requirement to notify the State Department, the IRS, the Social Security Administration, or USCIS of your Canadian citizenship.

When you renew your US passport, the application asks about prior passports and legal name history, not about what foreign citizenships you hold. Canadian citizenship is not a reportable change for passport renewal purposes. Your US passport continues to be issued, renewed, and used exactly as before.

The practical travel guidance for US-Canadian dual citizens is to use your US passport when entering and exiting the United States. This is standard advice for all dual citizens, not a restriction on Canadian status. When flying into Canada, you will use your Canadian passport at check-in, since Canada requires its citizens to board international flights on a Canadian travel document.

Consider Andrea from Buffalo, who received her Canadian citizenship certificate in early 2027 tracing ancestry to a great-grandmother born in Hamilton, Ontario. She renewed her US passport the same year. Nothing on the application changed. She applied for a Canadian passport shortly after, and now crosses the border regularly: Canadian passport to enter Canada, US passport to re-enter the United States.

Getting the citizenship certificate does not create financial reporting obligations by itself. If you open a Canadian bank account, investment account, or TFSA, US reporting rules may apply. The FBAR threshold is $10,000 in aggregate foreign financial accounts at any point during the calendar year, and filing is a disclosure requirement, not a new tax. For a full breakdown of how FBAR, TFSA, and RRSP interact with your US return, see the Canadian dual citizenship and US taxes guide.

The citizenship certificate itself changes nothing on your Form 1040.

• Getting a Canadian citizenship certificate by descent: no effect on US citizenship
• No oath, no ceremony, no expatriating act
• US law requires both a voluntary expatriating act and explicit intent to relinquish citizenship to lose status
• No reporting required to State Department, IRS, or USCIS for the citizenship itself
• US passport renewal: no change
• Canadian bank accounts over $10,000 aggregate: FBAR disclosure required

The most common reason people hesitate before applying is fear of unintended legal consequences on the US side. That fear is understandable but unfounded. Canada and the United States have recognized dual nationality without conflict for decades, and the citizenship-by-descent path under Bill C-3 creates no tension with American status whatsoever.

MaplePass confirms your eligibility in two minutes and walks through the full CIT 0001 application for $199. The certificate is the first step; the Canadian passport, the right to work and live in Canada, and everything else follows from there.