South Carolina has a state income tax with a top marginal rate of 6.5%. H1B holders working in South Carolina must file a South Carolina state tax return (Form SC-1040 or equivalent) in addition to their federal return. State taxes are withheld from your paycheck automatically by your employer.
South Carolina State Income Tax Overview
South Carolina has a state income tax with a top marginal rate of 6.5%. H1B holders working in South Carolina must file a South Carolina state tax return (Form SC-1040 or equivalent) in addition to their federal return. State taxes are withheld from your paycheck automatically by your employer.
H1B Tax Filing in South Carolina
As an H1B holder in South Carolina, you are treated as a US tax resident if you pass the Substantial Presence Test (183+ days). You must file both a federal return (Form 1040) and a South Carolina state return.
| Tax Item | South Carolina Details |
|---|---|
| State Income Tax | Up to 6.5% |
| State Tax Return | Required — due April 15 |
| Federal Tax | 10–37% (same in all states) |
| FICA (SS + Medicare) | 7.65% of wages |
| FBAR | Required if foreign accounts > $10,000 |
Tax Deductions & Credits for H1B Holders in South Carolina
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- 401(k) contributions — Reduce federal (and most state) taxable income dollar-for-dollar, up to $23,500 in 2026
- HSA contributions — Triple tax advantage: pre-tax contributions, tax-free growth, tax-free medical withdrawals
- Student loan interest — Deduct up to $2,500 in student loan interest paid (income limits apply)
- Foreign tax credit — Offset US taxes with taxes paid to your home country on the same income
- Home office deduction — If self-employed or a contractor (not applicable for W2 employees)
Total Tax Burden: South Carolina vs Other States
For an H1B holder earning $120,000/year, here's how South Carolina compares to other popular H1B states:
| State | State Tax | On $120K Salary |
|---|---|---|
| California | Up to 13.3% | ~$8,800 |
| New York | Up to 10.9% | ~$7,200 |
| South Carolina (You) | Up to 6.5% | ~$5,460 |
| Texas | 0% | $0 |
| Florida | 0% | $0 |
Frequently Asked Questions
Common questions about h1b taxes in south carolina: sc state tax guide (2026)
Do H1B holders in South Carolina need to file a state tax return?
Yes — H1B holders working in South Carolina must file a South Carolina state income tax return in addition to the federal return. The state return is due April 15, the same as the federal return.
What is the state income tax rate for H1B holders in South Carolina?
South Carolina has a top marginal state income tax rate of 6.5%. The actual rate you pay depends on your taxable income — the marginal rate only applies to income above the top bracket threshold.
Can H1B holders in South Carolina claim state tax deductions?
Yes. South Carolina follows most federal deductions but may have state-specific rules. Key deductions include 401(k) contributions, mortgage interest, and charitable contributions. Consult a CPA for South Carolina-specific tax optimization.
Do H1B holders in South Carolina pay FICA taxes?
Yes — all H1B holders in all US states pay FICA taxes (Social Security at 6.2% up to $176,100 and Medicare at 1.45%, plus 0.9% Medicare surtax on income above $200,000). FICA is the same regardless of which state you work in.
Should I choose South Carolina or a no-tax state for my H1B job offer?
For H1B holders choosing between states, South Carolina's 6.5% top rate is one factor among many. A higher salary in a high-tax state often more than compensates for the extra taxes. Always compare after-tax income, not just the tax rate.