Below is an instruction for form 1116 line 18 on IRS website, however turbo tax failing to adjust qualified deductions and not matching form 1040 line 15
Individuals: Enter on line 18 the sum of (i) Form 1040,
1040-SR, or 1040-NR, line 11b, minus Form 1040, 1040-SR,
or 1040-NR, line 14; and (ii) Schedule 1-A (Form 1040),
line 37.
