2026 official-source estimate
South Carolina Paycheck Calculator
Estimate 2026 South Carolina withholding from the official WH-1603F formula and the employee’s SC W-4 elections.
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Pay classification
Work locations and home state
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Federal withholding profile
Federal W-4 adjustments
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Year-to-date wages and other deductions
Included
What this estimate covers
- Federal income tax withholding
- Social Security and Medicare
- 2026 South Carolina WH-1603F subtraction-method formula
- $5,000 for each SC W-4 allowance and the conditional 10% standard deduction
- SC W-4 additional withholding and a valid annual exemption
Limitations
What is not included
- Supplemental-wage and nonwage withholding methods
- Interstate wage allocation and residency exceptions
- Enterprise Zone and job-development employer credits
- Unentered employer benefits and unsupported deduction treatments
How the South Carolina estimate works
Enter gross pay for one pay period, federal W-4 adjustments, and the state details shown above. Federal withholding follows Publication 15-T. South Carolina annualizes the paycheck, subtracts $5,000 for each SC W-4 allowance, and—only when at least one allowance is claimed—subtracts 10% of annual gross wages up to the $7,500 withholding standard-deduction cap. The 2026 WH-1603F brackets are applied before returning the result to the selected pay period and adding SC W-4 Line 6.
Example: The official WH-1603F example uses $750 of weekly wages and three allowances. Annual wages of $39,000 are reduced by $15,000 of allowances and a $3,900 standard deduction. The resulting $20,100 taxable income produces $549.90 annually, or $10.58 per week. The calculator does not assume any unentered benefit deduction or invent a tax result.
Weekly, biweekly, semimonthly, and monthly are the supported paycheck frequencies. “Annual salary” is an earnings input and the annual view is a simple period multiplication; neither is an annual payroll-period method. The special Form W-4 adjustment for nonresident aliens is not modeled.
Source trail
Official data used on this page
Each rule is versioned and reviewed before production use.
See every checksum and effective date on the tax data sources page.