Canadian Citizenship by Descent

Summary

Canadian citizenship by descent can apply to a person born outside Canada through a Canadian parent. For many people born before December 15, 2025, Canada's 2025 changes can also help second-or-later generation cases, but the line still has to work parent-to-child all the way down. A Canadian grandparent, great-grandparent, or older direct ancestor is not enough by itself unless the intervening parent is also Canadian or becomes Canadian because of the same rule changes. It does not apply through a Canadian relative who is outside that direct line, such as an aunt, uncle, cousin, sibling, or spouse.

For decades Canada applied a strict first-generation limit: only the first generation born abroad to a Canadian citizen inherited. In December 2023 the Ontario Superior Court (Bjorkquist v. Canada) declared that limit unconstitutional. Bill C-3 received royal assent on November 20, 2025 and came into force on December 15, 2025.

The new rule has an important date split. People born abroad before December 15, 2025 to a Canadian parent are, in most cases, Canadian automatically even if they were previously blocked by the first-generation limit. IRCC also says this applies to a person born to someone who became Canadian because of the 2025 changes, which means a Canadian direct ancestor can matter generation by generation. For people born abroad on or after December 15, 2025, a Canadian parent who is Canadian by descent or adoption normally must show a substantial connection to Canada: at least 1,095 days of physical presence in Canada before the child's birth. That proof is not required when the Canadian parent was born in Canada or was granted Canadian citizenship before the child's birth, and Crown service exceptions can also apply.

Separately, the "Lost Canadians" provisions of the Citizenship Act restore citizenship to people who lost it (or never acquired it) under earlier legal regimes — most notably the 28th-birthday retention rule for those born abroad between 1947 and 1977, and old patrilineal rules that denied transmission through a Canadian mother.

Eligibility

You are a Canadian citizen by descent if:

• Simple first-generation case. You were born abroad, at least one biological parent was a Canadian citizen at the time of your birth, and that parent was born or naturalized in Canada. No action is required to "become" Canadian — you already are. The application is for a certificate of Canadian citizenship (proof), not a grant.
• Direct-line ancestor case for people born before December 15, 2025. If you were born outside Canada before that date, a Canadian grandparent, great-grandparent, or more remote direct ancestor may qualify you only if the citizenship connection reaches your parent first. In practice, your parent needs to be Canadian already or become Canadian because their own parent was Canadian under the 2025 changes. This is the major Bill C-3 change for many people who were previously blocked by the first-generation limit.
• Born abroad on or after December 15, 2025. If your Canadian parent was Canadian by descent or adoption, that parent usually must have spent at least 1,095 days in Canada before your birth. This requirement generally does not apply if your parent was born in Canada, was granted Canadian citizenship before your birth, or falls under a Crown service exception.
• Lost Canadian restoration. Your case falls under one of the specific pre-1977 or pre-2009 restoration scenarios listed below. Most are now automatic (restored retroactively by 2009 and 2015 amendments), but some require a discretionary grant under section 5(1)(f) of the Citizenship Act.

The "Lost Canadian" scenarios

• Born abroad to a Canadian parent between 1 January 1947 and 14 February 1977, and lost citizenship on your 24th or 28th birthday by failing to affirm it under the old retention rules. Restored automatically in 2009 (first generation) or 2015 (further restorations).
• Born before 1 January 1947 (before the Canadian Citizenship Act) to a parent who would have been Canadian at the time. A 2015 amendment restored most of these retroactively.
• Born to a Canadian mother but a non-Canadian father, and blocked by the pre-1977 rule that citizenship passed only through the father. Restored by amendments in 2009 and 2015.
• Canadian parent was naturalized in the United States before your birth, which under pre-1977 law caused them to automatically lose Canadian citizenship. Partial restoration applies; a section 5(1)(f) discretionary grant may be required.

If your situation may match one of these, confirm with IRCC or a Canadian immigration lawyer before concluding you have no claim.

Who does not qualify by descent

• Anyone born in Canada — you are almost certainly a Canadian citizen by birth already (Canada applies jus soli to almost all births on Canadian soil; the exceptions are foreign diplomats' children). Request a citizenship certificate or passport instead.
• People whose only Canadian connection is a side relative, such as an aunt, uncle, cousin, sibling, spouse, or in-law.
• People born abroad on or after December 15, 2025 whose Canadian parent was Canadian by descent or adoption and did not meet the 1,095-day substantial-connection test, unless a Crown service exception applies.
• Adopted children of Canadian citizens — these use a separate route, citizenship by adoption under section 5.1, not descent.

What This Route Allows

This route can help confirm or document citizenship in Canada when the citizenship-creating facts named above are proven. For many people in this category, the main work is evidence: civil records, family-link records, prior citizenship records, and any registration or restoration paperwork needed to show the claim.

What This Route Is Not

This is not a shortcut around documentation. Even when the citizenship claim is based on a right, you still need records that prove each required fact and family link.

Next Steps

1. Confirm your claim type. Identify whether you are first-generation abroad, claiming through an older Canadian direct ancestor under Bill C-3's new rule, relying on the 1,095-day parent connection test, or dealing with a Lost Canadian scenario.
2. If your Canadian connection is through a grandparent or older ancestor, confirm whether your parent is Canadian already or became Canadian because of the 2025 changes. A remote Canadian ancestor does not skip over the intervening generations.
3. Gather the full family-document chain. You will need records that connect each generation back to the Canadian person in the line: your long-form birth certificate, the Canadian person's proof of Canadian citizenship (citizenship certificate, Canadian passport, Canadian long-form birth certificate, or naturalization record), and any intermediate birth, marriage, adoption, name-change, baptismal, church, or other records needed to show the relationships clearly. For cases involving a birth on or after December 15, 2025 to a Canadian parent who is Canadian by descent or adoption, you will also need evidence of the Canadian parent's 1,095 days of physical presence, such as passports, tax records, school transcripts, or employment letters, unless the case falls under a Crown service exception.
4. Apply for a proof of Canadian citizenship (Form CIT 0001) through Immigration, Refugees and Citizenship Canada (IRCC). The fee is CAD 75.
5. If a Lost Canadian scenario applies, work with IRCC's dedicated Lost Canadians team — they review most files before formally opening an application and often confirm eligibility in writing.
6. Apply for a Canadian passport once you hold your citizenship certificate. Adult passports are CAD 160 for a 10-year validity.

Sources

• IRCC — Proof of Canadian citizenship — official application page.
• IRCC — Check if you may be a citizen — plain-language official guide to citizenship by birth, descent, adoption, and the 2025 changes.
• IRCC — Guide for citizenship certificate applications (CIT 0001) — official guide to supporting documents, translations, and physical-presence evidence.
• Citizenship Act, R.S.C. 1985, c. C-29 — the governing statute, including section 3 (citizenship by descent) and section 5(1)(f) (discretionary grant).
• Bjorkquist v. Canada, 2023 ONSC 7152 — the Ontario Superior Court decision striking down the first-generation limit.
• IRCC — Change to citizenship rules in 2025 — government summary of Bill C-3 and the substantial-connection test.
• IRCC — Bill C-3 comes into effect — official December 2025 backgrounder.
• IRCC — Changes to citizenship rules 2009 to 2015 — official reference for the Lost Canadian restoration scenarios covered by the 2009 and 2015 amendments.