Deductions & credits

@2382680 I don't see that.

In a test return with only $50k in foreign Schedule C income, the FEIE, I see no tax on the $50k. Well, almost. Since you want to pay FICA anyway, it is harmless that the FEIE is reduced by $3533 to $-46,467 because of the deduction for half of FICA paid. (1040 line 10 from Schedule 1, line 15/26). 

So there is no tax on the $50k. Just the FICA from Schedule SE. 

So I don't understand what you are seeing.  What is your Schedule 1, line 8d from 2555 line 45?

Here's some screenshots from my test return:

Schedule C:

Schedule C

2555=p3

schedule SE

1040