South Carolina figures what you pay taxes on differently from the federal government.
So, in order to show what is taxed differently in South Carolina the TurboTax program starts with your federal income.
Then, if South Carolina adds taxes for some reason then your South Carolina taxable income would show as 'Additions to federal income' in order to arrive at a total that is the South Carolina taxable income.
In this case the subsistence allowance reduces the amount of income that you pay taxes on so the South Carolina Taxable income is the federal taxable income MINUS the subsistence allowance.
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