What is a Tax Adjustment?

A tax adjustment, specifically a T1 Adjustment is filed when you want to change your tax return. You may want to file an adjustment it there are:

• Mistakes on your tax return
• Received new information or revised information after your tax filing
• Forgot to claim a deduction or a credit on your tax filing
• Received a Notice of Assessment that shows an error in your original tax filing

How to file a T1 Adjustment

You will need to complete the T1-ADJ form. This form can be found on Canada Revenue Agency (CRA) website or through a certified tax software. For multiple years that you want to make adjustment, you need to file a T1-ADJ per year and you’ll need the following information :

• The year you want to make changes
• Your SIN number
• Full name and address
• Details of the changes you want to make from your original tax filing
• The reasons for making the change

You can complete the T1-ADJ through the CRA’s My Account or by mail. If you are mailing your request, you must include copies of supporting documents.

You have up to 10 years to file a T1 Adjustment for a previous tax year.

The CRA will review your submission and should there be a tax refund, missing benefits that were owed to you such as the GST/HST credit, CRA will issue to you the payments. However, should there be a tax owing, you’ll need to pay the outstanding balance, plus any applicable interest charges and penalties.

For further information please contact Taxtron Support at 416-491-0333 or visit www.taxtron.ca (opens in a new tab)