THE FORM
Canadian citizenship by descent application.
Form CIT 0001 is used to apply for proof of Canadian citizenship under Bill C-3. Most of the work isn't filling out the form — it's getting the right things into the envelope alongside it. Here's how the form sits in the larger workflow, and how to document longer lines of Canadian ancestry.
Important note: if your Canadian ancestor is further back than your grandparents, you'll need a supplement to Section 9.
READ THIS FIRST
This page doesn't replace the IRCC instructions.
01
Read the official instructions first.
The IRCC instruction guide that comes with CIT 0001 is thorough and generally well-written. This page is not a substitute — it's a supplement that focuses on two sections the instructions leave room for interpretation on.
Read the IRCC instruction guide →02
This is not legal advice.
I'm not a lawyer. The choices I describe here are the ones I made on my own 7-generation application. Your situation may require different choices. When in doubt, consult a Canadian immigration attorney.
03
Verify you have the current form.
IRCC updates its forms periodically. The download links below point to the versions current as of this writing. Before you submit, visit the IRCC page directly to confirm you're using the most recent version.
WHERE TO GET IT
The official forms, straight from IRCC.
Always download fresh from canada.ca. Form versions change without notice, and an outdated form is one of the more common reasons applications get returned.
OFFICIAL · IRCC
CIT 0001
Application for proof of Canadian citizenship
The application form itself, plus the official instruction guide. The instruction guide is thorough and worth reading start to finish before filling out the form.
Open on canada.ca →OFFICIAL · IRCC
CIT 0014
Document checklist
The checklist IRCC provides to confirm your application packet is complete. It also lists the two IRCC mailing addresses (regular post and courier), so the official reference is always in your hand while you're preparing the packet.
Open on canada.ca →Form versions update periodically. Before you submit, refresh the download from canada.ca to confirm you have the most recent version.
SECTION 9
When the form runs out of generations.
THE PROBLEM
The form runs out of space.
Section 9 of CIT 0001 asks for information about your parent and grandparents only. For citizenship by descent applicants whose Canadian ancestor is further back — a great-grandparent, great-great-grandparent, or earlier — the form has no place to record the generations between.
THE WORKAROUND
Build a supplement.
IRCC's instructions direct applicants to attach supplemental documentation but don't specify the format, the order, or how to label it. Fill in Section 9 with what you can about your immediate parents — the supplement does the rest.
Here's how I built mine for a 7-generation application.
THE SUPPLEMENT, IN ORDER
Line of Descent
A single document walking every generation from your Canadian-born ancestor down to you.
Generational Evidence Summary
One per individual in the line, starting with your Canadian-born ancestor.
Supporting documents
Birth, marriage, and death records placed behind each summary.
Repeat for each generation
Back to your Canadian-born ancestor, in order.
FAMILY APPLICATIONS
One supplement, multiple applicants.
If you're filing for multiple applicants who share the same line of descent, the packet structure changes in two ways.
GENDER MARKER CHANGE
If your gender marker needs to change.
If the gender marker on your existing identity documents doesn't match how you currently identify, IRCC has a one-page form for requesting a different marker on your Canadian citizenship certificate. Submit it alongside your CIT 0001 application.
THE FORM
A single page, no fee.
The form is IRM 0002 — Request for a Change of Sex or Gender Identifier. You complete it, sign it, and include it with your CIT 0001 application.
FOR MINOR APPLICANTS
Both signatures required.
If you're filing for a minor, IRCC requires both the applicant and the parent or legal guardian to sign IRM 0002, plus proof of parentage or guardianship. This is a separate requirement from the standard CIT 0001 minor co-signature at age 14.
A NOTE ON TRAVEL
Border crossings can vary.
IRCC explicitly notes on the form that a Canadian citizenship certificate with a different gender marker than your passport or other travel documents may not be universally accepted at border crossings. Worth thinking about before you submit.
OUTSIDE THE SCOPE OF THIS PAGE
Document mismatches across generations, state-by-state amendment processes, and jurisdictional safety considerations are real concerns for many applicants and beyond what this page can responsibly address. For complex situations, a Canadian immigration attorney is the right resource.
OTHER APPENDIX FORMS
Two more appendices for edge cases.
If your application involves a name change in the line of descent or a date-of-birth correction on your supporting documents, IRCC has a supplemental appendix for each. The instruction guide walks through what's needed.
APPENDIX C
Document a name change.
For applicants whose legal name has changed — through marriage, court order, or other circumstance — or whose ancestors changed names across generations. The Appendix C template is on the templates page.
APPENDIX D
Correct a date of birth.
If your supporting documents show different dates of birth — or if your records contain errors that need correction — Appendix D handles it. See the IRCC instruction guide for what to submit.
KEEP GOING
Once your form is filled out, here's what else goes in the envelope.
The form is the centerpiece, but it's only one piece of the application package. Here's what else to prepare.
→ TEMPLATES
Cover letter, line of descent, evidence summaries
The supplementary documents that attach to CIT 0001 — especially essential for multi-generation applications.
→ REQUESTING RECORDS
Birth, marriage, and death records
Where to find vital records for every generation in your line, plus what to do when records come back in another language.
→ PHOTOS
Citizenship photo specifications
The IRCC photo requirements, common rejection reasons, and how to find a photographer who knows the specs.
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