Deductions & credits

Thanks.

So I am a resident for this year.

I signed a treaty for 2019 and was not withheld federal (only state) so I guess it works for the full two years.
W2 has empty bow 1 and 2. My 1042s has zeros for federal tax withheld. How much should I manually remove as negative amount? The whole gross income of 1042s? Minus Oct to Dec gross income?

Or My social security (and medicare) wadges?