Making changes to your tax return

3 steps to request a change

  1. Wait until you receive your notice of assessment before you request the change. Do not file another taxTax A fee the government charges on income, property, and sales. The money goes to finance government programs and other costs.+ read full definition return for that same year.
  2. Complete and send the T1 Adjustment Request form to the Canada Revenue Agency (CRA). Or you can make changes online at My Account on the CRA website.
  3. Send any documents to the CRA to support the changes you want to make.

The CRA will take about 8 weeks to review and process your request. Then it will send you:

  • a notice of reassessment showing any changes to your return, or
  • a letter explaining why it did not accept the changes you requested.

You can request a change to tax returns from the last 10 years. Learn more about how to make a change.

Key point

You can request a change to tax returns from the last 10 tax years.

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