Canadian investors cannot contribute directly to a RRIF but funds from an RRSP, another RRIF, a Registered Pension Plan, or a commuted RRSP annuity can be transferred into one. Some RRIFs are similar to continuing an RRSP beyond age 70, with the exception that RRIF holders must take some taxable payments from the RRIF. Any level of payment can be chosen as long as the total withdrawn each year is at least equal to the minimum mandatory amount (based on the age of the plan holder or their spouse). There is no maximum payment level and many RRIFs allow holders to fluctuate payment options from year-to-year. RRIFs are designed to be a supplement to the Canada Pension Plan in providing retirement income to Canadians.