You are correct, you can be a resident of Tennessee if that is your permanent address and you are away at school. There is no Tennessee individual state income tax required, due to the repeal of The Hall Act.
However, if you are married filing jointly, and your spouse is a resident of South Carolina, then according to the South Carolina requirements, you will file a non resident return, where your spouse can claim South Carolina income. This may be why there is a message about preparing the non-resident state return.
If you file a joint federal return, you must file a joint South Carolina return SC1040 with Schedule NR. The resident spouse will report to South Carolina all income for the entire year. The spouse who is not a resident on the joint return will only report income earned in this state, if any.
If you file separate federal returns, you must file a separate South Carolina return. Your spouse must also file a separate South Carolina return if he/she has income taxable by South Carolina.
South Carolina Filing Requirements
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