@Carl Carl's advice is the easiest. another way is if you know your mortgage balance on 12/31/2019 and 12/31/2020 and the total mortgage payments excluding escrow deposits
mortgage balance on 12/31/2020 less the balance on 12/31/2019 is the principal you paid
not if you know the mortgage principal and interest payments made in 2020 just subtract the principal portion as determined above to arrive at the interest.
