When you withdraw RRSP (excluding Hoome Buyer's Plan), banks will immediately take a percentage(%) off the withdraw amount as the tax. At the end of year, the bank will inform CCRA about your RRSP, and you will have to file the RRSP withdraw amount as your income at your income tax form. Depend on how much you withdrew, and your annual income of the withdrew year, you may owe CCRA income tax.