If the technical requirements of the Income Tax Act (Canada) are met, a taxpayer can mortgage her house to her RRSP and then deduct the interest on the loan from the RRSP, if the loan proceeds are on-loaned to Opco. See CRA technical interpretation 2015-0601211E5 dated June 1, 2016, summarized in Georgina Tollstam, “Deduction for Interest Paid to RRSP on Mortgage Loan” Canadian Tax Highlights 24:11 (Nov 2016).
