You should rely on TurboTax to calculate the amount of your South Carolina taxes.  TurboTax guarantees the calculations are 100% accurate.

It is a small difference, so I know I’m looking in the right place on the SCDOR website. Basically, if I take what TurboTax says, I’m going to be accepting a smaller refund than I would if I filed on paper. It’s very small, but it’s still my money. I wish there was a way to show the discrepancy to TurboTax, but I don’t see a way to talk to them directly without paying money. 😕

The tax rates/tables that TurboTax uses are based on information provided by the states and then approved by the states.  If I were you, I would trust TurboTax.  Your alternative is to file a paper return by mail and make the calculations yourself or change what TurboTax calculates.

I had the same problem. It is not a matter of a calculation. It says they (TurboTax) are getting the information from SC1040TT, but when you look at that table on the SCDOR website, the amounts do not match. So either the SCDOR website is incorrect, or the information in TurboTax's copy of SC1040TT is incorrect.

That was my conclusion as well. For me, it was a small enough difference that I just went ahead and filed. However, it certainly doesn’t instill confidence.