Penalties and Interest
If you owe money to Revenu Québec, you must pay the debt by the deadline prescribed by law to avoid incurring interest and penalties.
However, if you cannot pay the entire amount owed in one lump sum, you can always propose a payment agreement based on your ability to pay.
Any overpayment you make will be refunded with interest if the refund is made after the deadline prescribed by law.
Under the GST system, different interest rates are applied to amounts owing and refunds. The rates are given on the Prescribed interest rates page on the Government of Canada website.
In specific situations, Revenu Québec may cancel interest, penalties or charges at your request.