In 2021 / 2022 we completed and rented a suite in our basement - what renovation costs (eg LOC interest for reno loan) can we claim as current costs (not claiming CCA)?

We began renovations in 2020 using money from our mortgage, and used a contractor for the work - can we also use the mortgage and loan interest over that period as a current cost listed as a construction soft cost?

Self-employed

You can't deduct the repayments of principal on your mortgage or loan, only the interest.