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How Self-Employment Tax Works in South Carolina (2026)
Self-employment tax is 15.3% — 12.4% Social Security plus 2.9% Medicare — applied to 92.35% of your net self-employment income, on top of federal and South Carolina income tax. Half of the SE tax (7.65% equivalent) is an above-the-line deduction against your federal taxable income.
| Piece | Rate / rule |
|---|---|
| Net earnings subject to SE tax | 92.35% of net profit |
| Social Security portion | 12.4% (up to $184,500 of net earnings) |
| Medicare portion | 2.9% · +0.9% above $200,000 |
| Deductible half of SE tax | 50%, above-the-line on your federal return |
Estimated payments are due quarterly (roughly mid-April, mid-June, mid-September, and mid-January). The 20% Qualified Business Income deduction (§199A) is not modeled here — it depends on your income level and business type. If you also have W-2 wages, the Social Security cap is measured against your combined earnings, so this estimate runs high.
South Carolina Self-Employment Tax by Income (2026)
Single filer, 1099 income is the only earnings for the year. The quarterly figure is an even 4-way split of the annual total.
| Net 1099 income | SE tax | Federal tax | South Carolina tax | Quarterly payment |
|---|---|---|---|---|
| $20,000 | $2,826 | $249 | $71 | $787 |
| $40,000 | $5,652 | $2,281 | $441 | $2,093 |
| $60,000 | $8,478 | $4,511 | $1,158 | $3,537 |
| $80,000 | $11,304 | $7,527 | $2,126 | $5,239 |
| $100,000 | $14,130 | $11,616 | $3,094 | $7,210 |
South Carolina Self-Employment Tax FAQ
What are South Carolina's income tax brackets for 2026?
South Carolina uses 2 marginal brackets ranging from 1.99% to 5.21%.
How much is take-home pay on $65,000 in South Carolina?
On a $65,000 gross salary, a single filer in South Carolina takes home roughly $51,987/year (about $4,332.25/month) after federal tax, FICA, and state tax.
What deductions does South Carolina apply before taxing my income?
South Carolina applies a $15,000 standard deduction, before its marginal bracket schedule. See the "How South Carolina Paycheck Tax Is Calculated" section above for the exact formula.
Does this estimate change if I'm married or have dependents?
This calculator uses single-filer figures only (v1 scope). Married filing jointly typically uses different federal and South Carolina state brackets and a larger standard deduction — your actual take-home pay will differ. Dependents can also reduce federal withholding via the W-4. Check South Carolina Department of Revenue's married-filing-jointly tables for a precise figure.
Methodology & Source
South Carolina state tax figures sourced from South Carolina Department of Revenue (https://dor.sc.gov/), citing H.4216 (signed 2026-03-30) — 2-bracket overhaul, 1.99% under $30,000 / 5.21% above, decoupling from the federal standard deduction. Federal brackets, standard deductions (single/MFJ/HoH), and FICA constants sourced from the IRS (Revenue Procedure 2025-32; married-filing-jointly Additional Medicare threshold of $250,000 is a separate, unindexed statutory figure). South Carolina's married-filing-jointly and head-of-household figures are not yet independently verified and currently fall back to single-filer brackets — see the caveat in the formula section above.
Self-employment tax uses the statutory 15.3% rate (12.4% Social Security + 2.9% Medicare) on 92.35% of net self-employment income, with half of the SE tax deducted from federal taxable income above-the-line — per IRS Schedule SE (Form 1040) instructions, IRC §1401 and §164(f), 2026 edition. The 20% Qualified Business Income deduction (IRC §199A) is not modeled — it phases out by income and business type and is too state/entity-dependent to compute generically. This assumes the self-employment income is your only earnings for the year; if you also have W-2 wages, the Social Security wage-base cap and Additional Medicare threshold are actually based on your combined earnings, so this will overstate SE tax if you have significant wage income too.
This is an estimate based on standard single-filer federal, FICA, and SC state calculations. Actual withholding may differ based on your W-4 elections, pre-tax deductions, and other factors. H.4216 replaces the federal standard deduction with a new "South Carolina Income Adjusted Deduction" (SCIAD) of $15,000 for single filers — but that amount phases out on a sliding scale between $40,000 and $95,000 of federal AGI (numerator = AGI over $40,000, denominator = $55,000). This estimate applies the full $15,000 regardless of income, which understates SC tax for filers in that phase-out band. Verify at dor.sc.gov for high-precision use.
Guideline version: 2026-SC-v1 · Effective: 2026-01-01 · Last verified: 2026-07-26