Question: how to file qst return?
Answer: To file your GST/HST and QST returns by mail, complete the GST/HST-QST Return (form FPZ-500-V) that we sent you. The return includes a detachable remittance slip that you can use to make your combined GST/HST–QST remittance in a single payment. Click Remittance or Refund for more information.