Fill Out CRA Form RC66 Online
Canada Child Benefits Application
Canada Revenue Agency
Applies for the Canada Child Benefit and registers children for the GST/HST credit and related programs.
Reviewed July 2026
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Form RC66, Canada Child Benefits Application, is the paper application for the Canada Child Benefit (CCB) and it also registers your children for the GST/HST credit and related federal, provincial, and territorial programs. Parents typically use it when a child is born, when a child comes into their care, or when they become residents of Canada with children.
You can fill out the RC66 in the Universal PDF editor, complete the parent and child sections on screen, sign it, and download the PDF to mail to the CRA along with any documents the form requires. Newcomers and some other applicants also need to attach Form RC66SCH.
What is Form RC66 used for
The application establishes who is primarily responsible for the care and upbringing of the children and collects the information the CRA needs to calculate benefit payments, which are based on family net income from tax returns. One application covers all children in your care, and it also serves as the registration for the GST/HST credit and various provincial and territorial programs delivered with the CCB.
You do not always need this form. Most parents of newborns can apply through the Automated Benefits Application when registering the birth, and existing CRA My Account users can often apply online instead of on paper.
Who files Form RC66
The parent who is primarily responsible for the children applies. Where the CRA presumes the female parent in the household is primarily responsible, the form explains how a different arrangement is declared. Shared custody situations have their own rules, described in the official instructions, that can result in split payments.
Both you and your spouse or common-law partner generally must file tax returns every year for benefit payments to be calculated and continued, even if one of you had no income.
How to fill out Form RC66
The application walks through your household and each child:
- Applicant information: your name, social insurance number, address, marital status, and residency details.
- Spouse or partner information: their name, social insurance number, and income details where the form asks for them.
- Child information: each child's name, date of birth, place of birth, and when they came into your care.
- Primary responsibility: confirmation of who primarily cares for the children, with the declaration the form requires for your situation.
- Supporting documents: proof of birth for children born outside Canada or not registered provincially, and any other documents the checklist requires.
- Signature: sign and date the application; both spouses sign where the form requires it.
Where to send it
Mail the completed application and documents to the tax centre that serves your area; the current addresses are listed on the official CRA website. If your situation requires Form RC66SCH, send it in the same envelope so the application can be processed together.
Frequently asked questions
Often not. Most provinces and territories offer the Automated Benefits Application when you register the birth, which applies for the CCB at the same time. Use the RC66 if you did not apply that way.
The parent primarily responsible for the children's care. The form and its instructions explain the CRA's presumption and how to declare a different arrangement when it does not match your household.
Payments are calculated from your family net income reported on tax returns, the number of children, and their ages. The current calculation details are in the CRA's published guidance.
Generally yes. The CRA needs both returns each year to calculate payments, even when one spouse or partner has no income to report.
When the form's checklist says so, typically for applicants or spouses who are newcomers, are not Canadian citizens, or became residents of Canada within the period the instructions describe.
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