RC66 is the Canada Child Benefit Application. A newcomer to Canada, a new landed immigrant, or a returning resident needs to fill out this application and submit it to the CRA for the CRA to determine your child and family benefits and credits in Canada.
Based on this submission, CRA will determine your eligibility for the Canada Child Benefit and other benefits you may be entitled to.
You need to provide the following information:
As a newcomer or returning resident of Canada, the information provided on this form will be used to calculate your entitlement, if eligible, for the Canada child
benefit, the goods and services tax/harmonized sales tax (GST/HST) credit, the Canada Carbon Rebate, and any other related provincial or territorial programs
administered by the CRA.
To continue receiving benefits and credits, you need to do your taxes on time every year so that the CRA can calculate your payments, even if you had no
income in the year. If you have a spouse or common-law partner, they also need to do their taxes every year.
Resources used: Canada Revenue Agency