State tax filing

The negative refund means TurboTax is saying you owe tax to North Carolina.

If you worked in North Carolina you have NC taxable income. Generally, you will have to file a NC nonresident return if you are required to file a federal return.

See Individual Income Filing Requirements

The amount you owe is probably a lot less than a few thousand. TurboTax’s NC section allows you to split your income. Report only your gym income and the half week’s work in NC.

On “Wages Allocation” Not NC Source Income should be your total income – SC income for that W-2.

South Carolina will give you credit for tax paid to NC.