South Carolina Quarterly Tax Calculator 2026
Rates reviewed · South Carolina Department of Revenue
South Carolina has a top income tax rate of 7%. Quarterly estimated payments required if you expect to owe $100 or more.
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Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.
South Carolina quarterly tax questions
How much is the quarterly tax for freelancers in South Carolina?
Freelancers in South Carolina pay federal self-employment tax (15.3% of net self-employment income), federal income tax at their bracket, and South Carolina income tax of up to 7%. This calculator applies 7% as a representative South Carolina rate for freelancer-level income; the top marginal rate is 7%.
When are quarterly estimated taxes due in South Carolina for 2026?
South Carolina follows the federal estimated tax schedule for 2026 — Q1: April 15, 2026, Q2: June 16, 2026, Q3: September 15, 2026, Q4: January 15, 2027. The Q3 payment is due September 15, 2026.
Do I have to make South Carolina estimated tax payments?
South Carolina requires estimated payments once you expect to owe $100 or more in state income tax for the year. The state form is Form SC1040ES. Payments can be made online through MyDORWAY. Filing and paying federal estimated tax does not cover the state amount — they are separate payments.
Where do I pay South Carolina estimated taxes online?
South Carolina accepts online estimated tax payments through MyDORWAY, run by the South Carolina Department of Revenue. Federal payments go through IRS Direct Pay or EFTPS separately.
What happens if I underpay estimated taxes in South Carolina?
The IRS charges an underpayment penalty based on the amount underpaid and the number of days late. Paying at least 90% of this year's tax or 100% of last year's (110% if your AGI exceeded $150,000) meets the federal safe harbour. South Carolina applies its own interest and penalty on late or short state payments.
State payments are administered by the South Carolina Department of Revenue via MyDORWAY.
Tax Information Notice
This content is for informational and educational purposes only. It does not constitute tax, legal, or financial advice. Tax laws change frequently. Always consult a qualified CPA or Enrolled Agent for your specific situation.