An IRCC officer reviewing your proof of citizenship application tests each fact your claim depends on. For each one, the officer asks whether your evidence makes it more likely than not to be true.
Lawyers call that standard the balance of probabilities. IRCC’s guidance tells officers to presume the facts and evidence you present are true, unless they have a valid and compelling reason to doubt them.
The burden of proof sits with you, the applicant. CIC News has explained how officers apply that standard to each generation in how an immigration officer decides whether your family tree proves you’re a Canadian citizen by descent.
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The officer reads the law against your facts and decides how much each record proves. Applicants who answer the obvious questions inside the file leave that officer less to interpret.
IRCC’s officer instructions, intake rules and current application guide together set out what an officer checks before approving a certificate. IRCC hasn’t yet updated its officer instructions for Bill C-3, so this list draws on the updated application guide as well.
Those checks fall into six broad areas:
- whether your ancestor was Canadian under the law of their time, including any loss or restoration of citizenship;
- whether each generation connects to the next in your descent chain;
- whether your ID, name and date of birth line up across your documents and whether you’ve returned any earlier citizenship certificates;
- whether you were born outside Canada on or after December 15, 2025 to a Canadian parent who is also a citizen by descent or through adoption (in which case that parent needs 1,095 days of physical presence in Canada);
- whether your file leaves gaps that lead the officer to request more documents; and
- whether the file is complete.
Officers judge your ancestor by the law of their time
What the officer looks for: proof that each parent in your line was Canadian under the law in force when their child was born, and that nobody lost that status without a later law giving it back.
Canada has passed several citizenship laws, and the officer has to work out which one governed each birth in your line.
In May 2026, IRCC answered a written question in Parliament (Q-1009) by listing the proof it accepts for a Canadian ancestor. CIC News has covered this in more depth.
Older generations bring older rules. The 1947 Canadian Citizenship Act passed citizenship to a child born abroad through the “responsible parent.” In most families, that was the father. The mother took that role if the child was born out of wedlock and lived with her, if she was widowed, or if a court gave her custody. Parents also had to register a child born abroad, and the child later had to file to keep citizenship. Officers check which parent that law looked to at each birth.
Before 1947, Canadians were British subjects. Courts issued their naturalization certificates in lettered series from A to K, and the series set who a certificate covered. A Series A or B certificate covered the holder’s wife only if the court granted it before January 15, 1932. When a clerk later added a child’s name in the margin, the child gained status from that date.
Some documents prove the opposite of what families hope. For example, some people barred from naturalizing sometimes received a “Form K” certificate so they could claim homestead land. IRCC’s instructions treat a Form K as evidence that the holder was not a British subject at the time.
Officers apply the same test to lost citizenship. They check whether anyone in your line lost status under the law of the day, and whether a later law restored it. The 1947 Act stripped citizenship automatically in several situations. The current Citizenship Act restores most of those losses. For that reason, IRCC’s document checklist (CIT 0014) asks for proof of any other nationality you or your Canadian parent acquired before February 15, 1977.
IRCC will also search its own citizenship records on request. You can ask about another person, and a letter about someone who has died doesn’t expire. The letter won’t serve as proof of citizenship. Applicants use it to confirm an ancestor’s status before they gather the rest of the file.
The officer traces your line one parent and child at a time
What the officer looks for: an official record for each parent and child between you and your Canadian ancestor, issued by the authority that created it and naming both people.
CIC News covered this part of the review in its piece on how officers judge the generational links in a family tree. Seven rules shape most files:
- Officers want records from the office that created or keeps them, such as a provincial vital statistics office. A genealogy site can point you to a record but can’t stand in for it.
- IRCC has told archivists it sorts documents into primary and secondary tiers. When a birth record is missing, officers can weigh secondary records like baptismal certificates, census entries and boat manifests as part of the whole file, though a civil record from the original authority tends to carry more weight.
- Your Canadian parent has to be either your legal parent at birth or your biological parent. If that parent isn’t named on your birth certificate, IRCC looks at other records from the time of your birth, such as hospital records, court orders or surrogacy agreements, along with a written explanation, and it can ask for DNA. A parent who adopted you later doesn’t pass on citizenship by descent, though adopted people have a separate route to citizenship.
- A missing record calls for a written explanation plus evidence of the search, such as a reply from the archive.
- Quebec birth and marriage certificates issued before 1994 don’t qualify.
- A foreign birth certificate proves parentage only. The officer needs separate proof that your ancestor was Canadian.
- Translations for records that are not in English or French must come from a Canadian certified translator, or from a fluent person outside your family who swears an affidavit.
The officer checks that your identity is verifiable
What the officer looks for: IRCC’s instruction guide asks for two pieces of valid ID showing your name and date of birth, one with your photo.
Parents applying for a child who doesn’t have two IDs or a photo ID should include a letter explaining why. Birth certificates, Social Insurance Number cards, bank and credit cards, and old citizenship certificates don’t count as ID for this application.
To find out more about identity documents, you can read our dedicated article on the topic.
Names shift between a birth record and a passport. If you want a name on your certificate that differs from your birth certificate, the officer looks for a document connecting the two, such as:
- a legal change of name document
- a court order
- an adoption order
A name changed outside Canada takes more paperwork: an amended foreign passport or similar national document, a record linking the old and new names, and ID in the new name issued where you live.
For a family name alone, IRCC also takes a marriage certificate, a divorce decree or a civil registration of union. After processing starts, IRCC changes a name only to fix its own error or to reflect a legal change of name.
Dates of birth leave less room. You can’t ask for a different date once you’ve applied. Unless you file supporting documents up front, your certificate carries the date on your previous certificate, your birth certificate or your foreign passport.
Children born on or after December 15, 2025, face one more test
What the officer looks for: your date and place of birth, how your Canadian parent became a citizen and, if the test applies, proof that the parent spent 1,095 days in Canada before you were born.
This check skips anyone born before December 15, 2025, which covers most applicants. It applies to a child born outside Canada on or after that date whose Canadian parent was also born outside Canada and is a citizen by descent, or was granted citizenship as an adopted child. The test doesn’t apply if that parent was born in Canada, or became a citizen through naturalization before the child was born.
For that child, the officer confirms the Canadian parent spent at least 1,095 days in Canada before the birth, using form CIT 0555 and supporting records. The test doesn’t apply if your parent was posted abroad with the Canadian Armed Forces, the federal public service or a provincial public service when you were born, or if a grandparent held such a posting when your parent was born or adopted. Staff hired locally abroad don’t count.
CIC News explains the options in why your future children may face different rules.
An officer who finds a gap can ask you to fill it
What the officer looks for: a full answer, by IRCC’s deadline, to any request for more information, documents or an interview.
Section 23.1 of the Citizenship Act lets IRCC set a deadline for more information or evidence. Under section 13.2, IRCC can treat your application as abandoned if you miss that deadline without a reasonable excuse. Applicants who keep their email and mailing address current with IRCC make sure the request reaches them.
IRCC’s quality assurance program also calls some applicants in at random. At that interview, officers review original documents and can ask for more, including a DNA test.
Most incomplete files are returned before an officer reads them
What IRCC looks for: a signed and current CIT 0001 form, compliant photos and proof of payment, with every application in a family package complete.
IRCC checks completeness before any officer weighs your evidence. Its intake instructions name four things every paper application needs:
- the CIT 0001 form, with the information needed to assess it
- a signature
- photos that meet IRCC’s specifications
- proof of payment
Miss one and IRCC rejects the application and sends it back with a notice, without doing further work on it.
Files from Canada and the US also go through the full CIT 0014 checklist, which carries an extra risk for families filing together. The August 2026 checklist says IRCC returns the whole package when one application in it is incomplete. The instruction guide lists three more reasons for a return:
- an unsigned or undated form
- a form dated more than 90 days before IRCC receives it
- a post-dated form
Applicants outside Canada and the US get some leeway. Since March 1, 2026, IRCC staff have run those checks themselves, a job Global Affairs Canada used to do. They won’t return a file from abroad for anything beyond the four core elements, and they can ask for the missing item.
The instruction guide also asks applicants to write “N/A” in any section that doesn’t apply, since IRCC can return a form with blank answers as incomplete.
Families mailing several applications together often run each one against the checklist before sealing the envelope.
Where these files get complicated
Any one of these checks can stall a file on its own. Files get harder when two or more meet in one line, such as an ancestor born before 1947 whose surname changes spelling across records.
Applicants with files like these may choose to have an immigration lawyer match each generation to the right law and the right record before the package goes in.
To see whether your family line could qualify, try CanadaVisa’s citizenship by descent calculator.
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