Because the GST is administered by Revenu Québec, you can use a combined GST/HST-QST Return (form FPZ-500-V). This form, with its detachable remittance slip, allows you to make your combined GST-QST remittance using a single cheque.
You must file a return, duly completed and signed, whether the amount payable is positive, negative or nil. Your return must reach Revenu Québec
If you are an individual and you chose December 31 as the end-date of your fiscal period, you have until June 15 of the following year to file your return. However, any GST or QST payable must be remitted by April 30.