2025 Tax Year

South Carolina Side Hustle Tax Calculator

Calculate your South Carolina state tax (6%), federal tax, and self-employment tax on 1099 income.

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5.3 million residents

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2025 rates

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Last updated: January 2026 · Data from IRS Rev Proc 2024-40

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W-2 Income (from your day job)

Side Hustle Income *

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South Carolina offers side hustlers a moderate tax burden with progressive state income tax rates that top out at 6.0% for 2025—down from 6.5% in previous years. The Palmetto State continues to reduce rates, making it increasingly attractive for freelancers and gig workers. With growing metro areas in Charleston, Columbia, and Greenville, South Carolina has a thriving side hustle economy.

South Carolina Tax Guide

How Side Hustle Taxes Work in South Carolina

South Carolina uses a progressive income tax system:

**South Carolina state tax rates (2025):** - 0% on income up to $3,460 - 3% on $3,461 - $17,330 - 6% on income over $17,330

**No local income taxes:** - Charleston, Columbia, Greenville, and all SC cities do not levy income taxes - You only pay the state progressive rate plus federal taxes

South Carolina's top rate has been declining from 7% to 6%, with further reductions planned.

Example

What South Carolina Side Hustlers Owe

Let's say you're a single filer in Charleston with a $48,000 W-2 job and $14,000 in side hustle income from freelance photography, with $2,500 in business expenses.

**Your estimated taxes on the side hustle:** - Net self-employment income: $11,500 - Federal SE tax (15.3% of 92.35%): ~$1,627 - Federal income tax on side income: ~$2,530 (22% bracket) - South Carolina state tax (6%): ~$690 - **Total additional tax: ~$4,847**

Your effective rate on the side hustle is approximately 42%.

Important Dates

South Carolina Tax Deadlines 2025

South Carolina estimated tax deadlines: - **Q1**: April 15, 2025 - **Q2**: June 16, 2025 - **Q3**: September 15, 2025 - **Q4**: January 15, 2026

Use South Carolina Form SC1040ES for state estimated tax payments.

Save Money

Common Deductions for South Carolina Freelancers

South Carolina freelancers can reduce their 6% top rate tax burden through maximizing deductions. **Home office expenses**: Claim dedicated business space using simplified ($5/sq ft) or actual expense method. **Business mileage**: 67 cents/mile for 2025; important for rideshare drivers and those serving clients across Charleston, Columbia, or Greenville. **Equipment and supplies**: Computers, cameras, tools, and office supplies; South Carolina generally follows federal Section 179 treatment. **Professional development**: Courses, certifications, and educational materials related to your business are deductible. **Health insurance premiums**: Self-employed individuals can deduct 100% of health, dental, and vision insurance. **Retirement contributions**: SEP-IRAs (up to 25% of net self-employment income) and Solo 401(k)s reduce both federal and SC taxable income. **Marketing expenses**: Website costs, business cards, and promotional materials are deductible. South Carolina generally follows federal deduction rules, so most Schedule C deductions automatically reduce your state taxes. With ongoing rate reductions, SC is becoming increasingly attractive for side hustlers and freelancers.

Common Questions

South Carolina Side Hustle Tax FAQ

What is South Carolina's tax rate on side hustle income?

South Carolina has progressive rates with a top rate of 6% for 2025, applying to income over $17,330. The rate has been decreasing from 7% in recent years.

Does Charleston have a city income tax?

No, Charleston and all South Carolina cities do not have local income taxes. You only pay state-level income tax on your side hustle earnings.

Is South Carolina lowering its tax rates?

Yes, South Carolina has been phasing in tax rate reductions. The top rate dropped from 7% to 6% and may continue to decrease.

Do I need to register my side hustle in South Carolina?

Most businesses need to register with the SC Secretary of State. If using a trade name (DBA), file with the Secretary of State. LLCs must register with the Secretary of State. Sellers may need a Retail License from the SC Department of Revenue.

When are South Carolina quarterly estimated taxes due?

South Carolina follows federal quarterly deadlines: April 15, June 16, September 15, and January 15. Use Form SC1040ES for payments.

How do retirement contributions affect SC taxes?

SEP-IRA and Solo 401(k) contributions reduce your federal AGI, which South Carolina uses as its starting point. Every dollar contributed saves you at your federal rate plus 6% in SC state taxes.

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