A state's portion of adjustments to income

TT says: Allocate all or a portion of the deductions reported on your federal return to IL based on the length of your residency or the source of the deduction.

 

I ask: Where on the federal return does one find the deduction information?

 

TT says: Enter the amount that applies to the time you were an IL resident or to your activities in IL.

 

I say: I was not an IL resident during this tax year but did work in the state.