Can we still declare the interest we pay on a buy to let property mortgage? I used to but when I submitted my 2020/21 SA I heard we could no longer deduct this from our profit. I have since read that it should be added to the residential finance section. I have gone in and amended my SA for that year but it doesn't appear on the deductions and the tax to pay is unchanged. What's the point in entering it if it doesn't get deducted?