Reduction of deduction where section 25 credit taken (temporary)

(a) In general. The amount of the deduction under section 163 for interest paid or accrued during any taxable year on a certified indebtedness amount with respect to a mortgage credit certificate which has been issued under section 25 shall be reduced by the amount of the credit allowable with respect to such interest under section 25 (determined without regard to section 26).