不正确, 由于你用投资房A存款100k,用来还清自住房B的存款并拿回宅券时分, interest from this loan is not deductible because it is not incurred in the course of producing assessable income.
当你用自住房B存款100k, 用来还清投资房A的存款时分,the character of the new loan is derived from the original borrowing,so the interest on a new loan used to repay an existing loan will not be deductible because the interest on the original borrowing is not deductible。