Earning W2 wages in NC, and living in SC. During SC tax filing, will it look at NC taxable income after deduction or entire W2 wage and mark it as completely taxed in NC

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:

1. With your return open, select My Info in the menu.
2. On the Personal info summary screen, scroll down to Other State Income, and select Edit.
3. At the Did you make money in any other states? question, answer Yes and make sure your nonresident state(s) are selected from the drop-down.
4. Select Continue to return to your Personal info summary.

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.