Get your taxes done using TurboTax

I have a workaround thought - you could change the w2 SC tax withheld to a lower number on the w2 and then enter the remainder as other tax payments to SC. The IRS has the w2 with the correct amount for the totals to match up and the program will behave.

You can enter other tax payments made:  

1. federal tax deductions section  
2. Estimates and Other Taxes Paid. 
3. Select Other Income Taxes. 
4. Select withholding not already entered. 
5. Enter the state and amount.