T1-ADJ REQUEST

Once a return is assessed, mistakes or missed claims are corrected by asking the CRA to adjust it, not by filing a second return. Form T1-ADJ, T1 Adjustment Request, is the paper method; most people use online options.

WAYS TO REQUEST A CHANGE

• Change my return in CRA My Account.

• ReFILE through certified tax software (for returns filed electronically).

• Form T1-ADJ mailed with supporting documents.

RULES

• Wait until the Notice of Assessment for the original return is received.

• Changes can be requested for any year in the past ten calendar years, though refunds for older years may be at the CRA's discretion.

• Include line numbers, the previous amount and the revised amount, along with receipts.

• Processing typically takes two weeks for online requests and eight weeks or more for paper.

• An adjustment request is not an objection; to dispute an assessment, file a Notice of Objection.

COMMON REASONS

• A forgotten or amended slip.

• An unclaimed medical expense, donation or tuition amount.

• A newly approved disability tax credit, applied retroactively.

• A request to carry back a loss (Form T1A instead).