If I earn $100k in W2 in NC, but taxable income is marked as only $75k after standard deduction in NC. When I file SC tax, and it asks ,"Enter the portion that was taxed by both NC and SC". Should I enter $100k or $75k
South Carolina will calculate any taxes owed based on your entire wages from North Carolina (Box 1 of your W2).
As a resident of South Carolina, you are taxed on all your income regardless of where it is earned. In order to avoid double taxation, South Carolina allows a tax credit for taxes you paid to another state on wages earned in that state.
Once you've determined that you need to file a nonresident state return, the first thing you want to do is make sure you've filled out the Personal Info section correctly:
After you finish your federal return, you'll automatically move to the State tab, where you'll see your nonresident state(s) listed in addition to your resident state.
Tip: To ensure accurate calculations, always complete the nonresident return first if filing in multiple states because your resident state might give you a credit for any taxes paid in that situation.