If you file your income tax return late, you are liable to a 5% penalty on the balance not paid by the filing deadline. You are also liable to an additional 1% penalty for every complete month your return is late (maximum of 12 months).
As a rule, businesses and merchants who collect consumption taxes on behalf of Revenu Québec, but fail to remit the amounts owing within the time limit provided for, are liable to a penalty of:
Employers and payers who not comply with their fiscal obligations are liable to a penalty, which varies according to the situation. For more information, contact the Revenu Québec office in your area.