04/15/2026
This morning, Governor McMaster signed into law a new tax bill for South Carolina. A link to the text of the bill can be found here: https://www.scstatehouse.gov/sess126_2025-2026/bills/4216.htm
The law replaces the South Carolina individual income tax calculation with a new calculation that takes effect for 2026. As has been the trend with the state legislature, this bill makes changes after we are well into the new year causing new planning issues.
The law replaces the current rates with only two new rates, 1.99% on taxable income up to $30,000 and 5.21% on taxable income of income in excess of $30,000. The law also requires computing taxable income differently. In years past, the South Carolina tax calculation started with Federal taxable income. This year, it will start with adjusted gross income instead. The South Carolina law provides for a $30,000 exemption for married couples, $15,000 for single taxpayers and $22,500 for head of household filers. These amounts phase out once your Federal adjusted gross income exceeds $110,000 for married couples, $82,500 for head of household and $55,000 for single filers.
To see how this would affect you, grab your 2025 Federal return and get the amount on line 11a, this is your adjusted gross income. Apply the calculation above to see what your 2026 tax liability would have been in 2025 using the new law. Compare that to the amount on line 10 of your South Carolina tax return to see if your 2026 taxes will be higher or lower. Notably people who gave a lot to charity or had a large mortgage will not be able to benefit from those deductions on their South Carolina tax return any longer.
According to the Office of Revenue and Fiscal Affairs, 42.8% of South Carolina taxpayers will see a reduction in their taxes, which means over half of you will see a tax increase for 2026. This is on top of the tax increase from 2025. Also, the law is only one page long so we have questions about how the law will affect other provisions as they were not addressed. Also not addressed is how nonresidents and part year residents will fit into this tax structure. Presumably those things won't change since they were not addressed but we are now at the mercy of the SC Department of Revenue's guidance on a lot of these matters. We don't envy their position because there are a lot of uncertainties in the law.
The silver lining is that the law provides for the rate to be reduced starting in 2027 if income tax revenues increase by at least 5%. They will continue to drop as long as revenues increase by at least 5%. This sounds good on paper but mathematically this likely will not reduce the rate to zero as the bill intends because it would take a massive increase in taxable income to yield the rate reductions as the rate drops. Also it's not clear if the 5% increase is accounting for inflation or not.
As things become clearer, we will share updates as they are available.
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