I am a F1 visa Chinese student. I did 4 months intern in California in 2016, and spent the rest of the year as TA back in school in Idaho. So I have W-2 forms from both CA and ID.
Now I am confused about how to calculate the Idaho tax form 43, line 7 (idaho amounts). Wages, salaries, tips, etc. include Form(s) W-2.
Sprintax did it for me as the following method:
Idaho W2 box1 + 1042S ($5000) - non-taxable portion for ID of the tax treaty.
I have no idea how they calculated the third term above. they said tax treaty is prorated between California and Idaho. Also, should I add the $5000? my friend in Idaho told me I should NOT add, but he just had income from Idaho.
Any idea or comments? Thanks!