There's a special rule if you use a dwelling unit as a residence and rent it for fewer than 15 days. In this case, don't report any of the rental income and don't deduct any expenses as rental expenses. Tax Topic 415
South Carolina Filing Requirements. Nonresidents or part-year residents are required to file a South Carolina return if they work
in South Carolina or are receiving income from rental property, businesses, or other investments in South Carolina.
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