When you were saving for retirement, you were contributing to your Registered Retirement Savings Plan (RRSP) where tax is deferred until withdrawn from the RRSP. If the RRSP was transferred to a Registered Retirement Income Fund (RRIF), tax continues to be deferred until you make withdrawals from your RRIF. All withdrawals from a RRIF are fully taxable. The tax you pay is based on your taxable income which you may be able to reduce by taking advantage of deductions and credits.
While we are unable to provide advice, but always try to provide some general information to help take the next step. Speak with a registered financial representative or tax professional for advice that fits your situation. Visit GetSmarterAboutMoney.ca to learn about taxes, and living in retirement.