South Carolina 1099 Quarterly Tax Calculator
Built & reviewed by Nandu Kannan · Overtime rules cited to primary statutes
Estimate your 2026 quarterly taxes as a self-employed / 1099 worker in South Carolina. Enter your net profit to get self-employment tax, federal income tax, South Carolina state tax, and the four estimated payments with due dates.
| Quarter | Due | Amount |
|---|
| Self-employment tax (15.3%) | $0 |
| Federal income tax | $0 |
| State income tax | $0 |
2026 estimate. SE tax includes the half-SE deduction + simplified 20% QBI. State tax estimated on profit. Pay via IRS Form 1040-ES; states have their own estimated-tax vouchers. Due dates: Apr 15, Jun 15, Sep 15 (2026), Jan 15 (2027). Not tax advice.
How 1099 quarterly tax works in South Carolina
Self-employed workers pay the full 15.3% Social Security + Medicare (the "self-employment tax") on 92.35% of profit, plus federal income tax, plus South Carolina state income tax. The IRS expects this in four estimated payments rather than a single April bill. South Carolina taxes the first ~$3,500 at 0% and is cutting its top rate (6.2% and falling) by 0.1 point per year as revenue allows.
Frequently asked questions
How much should I set aside for taxes as a 1099 contractor in South Carolina?
It depends on profit, but as a rough guide a single filer with $60,000 of net 1099 profit in South Carolina owes about $14,082 total for 2026 — roughly $3,520 per quarter. That covers 15.3% self-employment tax, federal income tax, and South Carolina state income tax. Use the tool for your numbers.
When are 2026 quarterly taxes due?
Federal estimated taxes for 2026 are due April 15, June 15 and September 15, 2026, and January 15, 2027. Pay federal with IRS Form 1040-ES; most states have their own estimated-tax vouchers with similar dates.
What counts as profit?
Your 1099 / self-employment income minus legitimate business expenses (software, equipment, mileage, home office, etc.). Self-employment tax and income tax apply to profit, not gross revenue — so tracking deductions directly lowers what you owe.
Does South Carolina charge state income tax on 1099 income?
Yes. South Carolina taxes the first ~$3,500 at 0% and is cutting its top rate (6.2% and falling) by 0.1 point per year as revenue allows. The tool estimates it on your profit.
Other states
Alabama · Alaska · Arizona · Arkansas · California · Colorado · Connecticut · Delaware · All take-home tools