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Did you forget to file something or do you need to make changes for your tax assessment?

If you forgot to include income details or deductions in your tax return, or if you notice something in your tax assessment that needs to be changed, do this:

1

CHECK WHEN YOUR TAX ASSESSMENT ENDS

You can see the end date of your tax assessment on your tax decision or in MyTax. This date affects how you should report changes to your tax assessment.

2

IF YOUR ASSESSMENT IS ONGOING, MAKE CHANGES TO YOUR TAX RETURN

If the end date of your tax assessment has not yet passed, you can make changes and additions to your tax return:

  • If you find an obvious error in the tax decision (such as a mistake in a mathematical calculation, etc.), call our service number stated on the decision. That way, we can correct the error before your tax assessment ends.
  • If you notice that there are income or deduction details missing in your tax decision, submit them in MyTax or on paper before the end date of your tax assessment.

How to file online

How to file on paper

3

IF YOUR ASSESSMENT HAS ENDED, FILE A CLAIM FOR ADJUSTMENT

If the end date of your assessment has passed, you can request changes to your tax assessment by filing a claim for adjustment.

See the instructions for filing a claim for adjustment

Please note that if you file details late, you may have to pay a late-filing penalty or a punitive tax increase. Read more about the late-filing penalty and the punitive tax increase