South Carolina Self-Employed Taxes in 2026: 6.2% Top Rate, City Licenses, and the $100 Rule
South Carolina's top income tax rate is gliding down toward 6% — it sits at 6.2% for 2026 — and no city in the state taxes personal income. The two traps are elsewhere: a local business license tax on gross revenue that Charleston, Columbia, and Greenville expect even from home-based gig workers, and the lowest estimated-tax threshold in the region. Expect to owe just $100 of state tax and South Carolina already wants quarterly vouchers. Start with your combined number in the [South Carolina self-employed tax calculator](https://gigmytax.com/calculators/south-carolina-self-employed-tax), then read on.
The three layers of an SC 1099 tax bill
Federal income tax at the standard brackets, the 15.3% self-employment tax on 92.35% of net profit, and South Carolina's graduated state tax: 0% on the first slice of taxable income, 3% on the middle band, and 6.2% on the top. South Carolina starts from federal taxable income, which matters — every deduction you claim federally, from mileage to home office, reduces the state base automatically with no separate state paperwork.
The $100 estimate threshold
Most states set their estimated-payment trigger at $500 or $1,000 of expected tax. South Carolina sets it at $100. At a 6.2% top rate, that line is crossed by roughly $2,000 of taxable income — essentially any gig that runs for more than a few weekends. If you expect to owe $100 or more, file Form SC1040ES quarterly: April 15, June 15, September 15, 2026, and January 15, 2027, matching the federal dates. Paying through the MyDORWAY portal takes minutes and skips the vouchers entirely.
The safe harbor
Pay 90% of this year's SC tax or 100% of last year's in four installments and underpayment penalties stay at zero no matter how the year ends.
City business licenses: the surprise bill
No South Carolina city taxes income, but most cities and counties charge a business license tax calculated on gross revenue, and home-based businesses are not exempt. Charleston, Columbia, and Greenville each maintain their own rate classes; renewal is annual, often due April 30 or May 31, and many jurisdictions now route renewals through the SC Business One Stop portal. The amounts are usually modest for gig-scale revenue, but operating without the license turns a $100 fee into a fee plus penalties. The rule of thumb: you need the license of the jurisdiction you work from, not every city you drive through.
Deductions that carry the most weight
Because SC piggybacks on federal taxable income, the federal deduction list is the state deduction list. Mileage at $0.70 per business mile in 2026 dominates for drivers — 15,000 business miles is a $10,500 deduction worth roughly $650 of SC tax alone at the top bracket. The simplified home office deduction ($5 per square foot up to $1,500), business-use phone percentage, self-employed health insurance premiums, and SEP-IRA or Solo 401(k) contributions all follow. Retirement contributions reduce income tax but not the 15.3% SE tax, in South Carolina as everywhere else.
A worked example
A Charleston-area DoorDash driver grosses $38,000 in 2026 with 14,000 business miles ($9,800) and $1,200 of supplies, netting $27,000. Self-employment tax comes to roughly $3,814. After the standard deduction and the half-SE adjustment, federal income tax lands near $1,200 and South Carolina tax near $700 — a combined bill of about $5,700, or roughly $1,425 per quarter. Notice how the mileage deduction, not any credit, is doing the heavy lifting.
Common South Carolina mistakes
The three that recur: assuming the $100 threshold means estimates are optional for a small gig (it is the opposite — almost everyone crosses it); ignoring the city business license until a renewal penalty arrives; and double-counting vehicle costs by claiming gas receipts on top of the standard mileage rate. Fix those and the SC side of a 1099 year is genuinely simple.
Frequently asked questions
+What is South Carolina's income tax rate for gig workers in 2026?
Graduated brackets with a 6.2% top rate for 2026, stepping down toward 6% under current law. Lower bands are taxed at 0% and 3%.
+Do SC cities charge a local income tax?
No. Cities instead charge a business license tax on gross revenue, which applies to home-based gig work in jurisdictions like Charleston, Columbia, and Greenville.
+When are SC quarterly estimated taxes due?
April 15, June 15, September 15, 2026, and January 15, 2027 — the same dates as federal 1040-ES. File Form SC1040ES or pay via MyDORWAY.
+What is the SC estimated-tax threshold?
Just $100 of expected state tax — the lowest in the region. Nearly every gig worker with steady income should pay quarterly rather than settle up in April.
+How much should an SC gig worker set aside per payout?
Around 25–30% of net profit covers federal income tax, the 15.3% SE tax, and the state tax combined.
+Does the mileage deduction reduce South Carolina tax?
Yes. SC starts from federal taxable income, so the $0.70 per business mile 2026 rate lowers your state bill automatically.
About the author
Javed Niamat · Founder & Editor, GigTax
Javed Niamat founded GigTax to make self-employment tax math understandable for rideshare drivers, delivery couriers, creators and freelancers. He builds and maintains every calculator on this site and writes the guides that explain the numbers behind them.
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