You may not have allocated the correct amount of your income to South Carolina. In your South Carolina return, at the very beginning, there is a page where you select whether to file as:
- Resident OR part-year resident filing as a resident
- Nonresident OR part-year resident filing as a nonresident
Select "Nonresident OR part-year..."
Further in the program, there is a page where you allocate to South Carolina, the income earned while you were living or working there. See screenshot below.
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