As per Revenu Quebec: CORRECTING AN ERROR OR OMISSION
To make changes to an income tax return that has already been filed, do not file a new return. Instead, do one of the following:
- Use the online service in My Account for individuals (see "Using My Account to make changes to an income tax return" below).
- Complete form TP-1.R-V, Request for an Adjustment to an Income Tax Return, and mail it to us, together with the documents justifying your request.
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