Your unemployment is not taxed in South Carolina. However, all of your income is used to determine South Carolina tax. South Carolina figures out your tax by calculating how much tax you would pay on all of your income, and then prorating that amount on the percentage of income you receive from South Carolina. Even if the unemployment were from South Carolina, you still are not taxed on it in South Carolina, because you are only taxed on unemployment where you live, not from where you might be receiving it.
So, South Carolina doesn't tax your unemployment, but all of your income is used to determine South Carolina nonresident tax.
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