What is a letter of explanation for a Canadian citizenship by descent application, and when do you need to submit one?

If you've recently discovered you may be a Canadian citizen by descent under Bill C-3, you're probably getting ready to submit an application for proof of citizenship.

There's one document that doesn't get its own line on the checklist, but can still affect whether your file moves forward or is returned.

That's a letter of explanation.

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This article covers what a letter of explanation is, when Immigration, Refugees and Citizenship Canada (IRCC), Canada’s citizenship department, requires one, and how it differs from other supporting documents you may come across while preparing your application.

What is a letter of explanation?

A letter of explanation, sometimes shortened to LOE, is a written note included with your application that addresses gaps, missing documents, or details about your situation that the standard forms don't capture.

A letter of explanation is written by the applicant, or by their immigration lawyer if they've hired one as a representative. It needs to be signed by the applicant.

IRCC's instruction guide for the Application for a Citizenship Certificate (CIT 0001) tells applicants to provide a letter of explanation for any documents that are missing, not included, or that require further clarification.

Unlike your birth certificate or your photos, a letter of explanation doesn't have its own line on the Document Checklist (CIT 0014).

It's a requirement that surfaces only in specific circumstances laid out in the instruction guide. However, in some cases applicants also like to proactively provide their own letters, outlining their lineage or to provide further explanation in complex cases.

When do you need one?

You need to include a letter of explanation in the following situations:

Missing documents. If a document required for your application isn't included, you need to submit an LOE or risk having your application returned. This applies to birth, marriage, or death records needed to complete your file.

Documents that can't be sourced. IRCC requires documents issued by the original source authority. If you can't get a document from that source, you need to explain why, along with proof that you tried to obtain it.

Name variances. A grandparent's name might appear one way on a Canadian birth record and another on a US marriage certificate, whether from a maiden name, an anglicized spelling, or a clerk's error. Your letter explains that both names refer to the same person, and points to the documents that connect them.

Date discrepancies. Older records sometimes disagree on a date of birth. Your letter states which date is correct and why, then points to the supporting document.

For minor applicants. If you are applying on behalf of a minor who doesn't have two pieces of identification, or doesn't have one piece with a photo on it.

This isn't an exhaustive list. IRCC can flag other gaps in a file that call for a written explanation.

What to put in a letter of explanation?

A strong letter of explanation does four things:

• It names the specific document at issue.
• States why that document is missing or unclear.
• Explains what you’re submitting in its place.
• Shows what you did to try to obtain the original.

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Why having a letter of explanation is necessary

An officer reviewing your file must trace an unbroken line from you back to your Canadian ancestor, verifying names, dates, and the relationship between each generation along the way.

When a document is missing, or a detail doesn't line up, and there's no explanation attached, the officer has no way to tell whether that's an ordinary clerical gap or if the application is incomplete.

IRCC's guide notes that if required documents are missing, your application will be returned.

A letter of explanation closes that gap. It tells the officer what happened and why, instead of leaving them to guess.

Does an application need multiple letters of explanation?

In most scenarios, one letter outlining gaps or inconsistencies across the application should suffice. In some instances, such as when an applicant is missing a second piece of valid identification, a second document may be submitted.

If you're working with a licensed immigration lawyer or consultant, they'll be able to share more personalized guidance, based on your application.

Is a letter of explanation the same as a no-record letter?

No. A no-record letter comes from an original source authority, such as a vital statistics office or archive, confirming that an applicant has reached out and searched for a specific record, yet found nothing.

An LOE and a no-record letter can work together: a no-record letter shows that a document genuinely doesn't exist, while a letter of explanation tells the officer what that means for your case and what you're submitting in its place.

Is a letter of explanation the same as a cover letter?

No. A cover letter gives the officer a holistic view of your case: who you are, your relationship to your Canadian ancestor, details about your lineage, and a summary of what's included in your package.

A letter of explanation is narrower. It addresses one specific issue, such as a missing document or a discrepancy between records. The two can overlap, and content from a letter of explanation is often folded into a cover letter rather than kept as a separate document.

Submit a complete application the first time

If you've recently discovered you may be a Canadian citizen by descent, it's worth applying sooner rather than later. As of September 2026, the processing time for these applications is 33 months, and that figure has been rising steadily. It could climb further in the months ahead.

That makes it even more important to submit a complete, error-free package the first time. We've put together a list of common mistakes applicants make when submitting this type of application, and how to avoid them.

If you have doubts, or a more complicated application, an immigration lawyer can help you draft a stronger letter. Lawyers who handle citizenship by descent applications have experience spotting gaps in files and know how IRCC officers typically interpret the law.

This article is provided for general information purposes only, and does not constitute legal advice.

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