South Carolina estimated tax (quarterly) calculator

Plan quarterly payments based on South Carolina tax rules.

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How this calculator works

Step 1 estimates your South Carolina tax based on the taxable income you provide and the applicable state bracket schedule. The tool adjusts for South Carolina-only income using your allocation %.

Step 2 uses your withholding and prior-year tax (if provided) to estimate a quarterly plan that aligns with South Carolina's 90% current-year or 100% prior-year safe-harbor rules.

Step 3 divides the remaining tax into four equal payments and lists the standard due dates used by South Carolina.

Frequently asked questions

When are South Carolina estimated payments due?

South Carolina uses the standard quarterly dates: April 15, June 15, September 15, and January 15 of the following year.

What if withholding changes later?

Recalculate with updated withholding to keep your quarterly plan accurate.

Is the safe harbor the same as federal?

South Carolina generally follows a 90% current-year or 100% prior-year safe harbor. Special rules apply if at least two-thirds of your income is from farming or ranching.

Estimates use South Carolina's published brackets and are not a substitute for official payment calculations.

South Carolina estimated tax calculator

Quick answer

South Carolina uses 1.99% to 5.21% progressive income tax rates in the current TaxGuide Pro calculator data. Use this South Carolina estimated tax calculator for 2026 state tax planning, then verify the estimate with the official state tax agency.

Also answers

  • South Carolina estimated tax calculator
  • South Carolina tax calculator 2026
  • South Carolina income tax rate 2026
  • South Carolina state tax refund status

Good fit when

  • South Carolina residents checking 2026 tax planning
  • Part-year or nonresident South Carolina filers
  • Comparing state tax, withholding, refund, and deduction scenarios

Have ready

  • Filing status and residency
  • State taxable income or benefit amount
  • Withholding, payments, deductions, credits, or filing date as relevant

Result you get

State-specific estimate, next-step notes, and official South Carolina source links.

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South Carolina state facts

Rate rules and worked examples

Examples use 2026 taxable income before credits or residency allocation. Use the official state source below to verify final filing guidance.

Income tax rule

South Carolina uses 1.99% to 5.21% progressive income tax rates in the current TaxGuide Pro calculator data.

Single example

$60,000 single taxable income -> about $2,160 state income tax before credits.

Joint example

$120,000 married filing jointly taxable income -> about $5,286 state income tax before credits.

Deductions and exemptions

Residency, local taxes, deductions, credits, and special income rules can change the result.

Credits to review

Review dependent, household, income-based, and other South Carolina credits in the state credit finder, then confirm eligibility in official instructions.

Filing deadline

For a 2026 return filed in 2027, confirm the due date in published South Carolina instructions. State deadlines and disaster relief can differ from federal dates.

Refund processing

South Carolina does not guarantee one refund date for every return. E-filed, accurate returns with direct deposit are generally processed faster than paper or reviewed returns.

Official verification: South Carolina official tax agency.

How this calculation works

  • Compares projected state tax with withholding and payments.
  • Splits a remaining balance into planning installments.

Common mistakes and caveats

  • The result is an educational estimate, not a filed return or agency determination.
  • Residency, local taxes, deductions, credits, and special income rules can change the result.
  • Verify current forms, instructions, and deadlines with the official state tax agency.

FAQ

What is the South Carolina income tax rate for 2026?

South Carolina uses 1.99% to 5.21% progressive income tax rates in the current TaxGuide Pro calculator data. The examples on this page use taxable income before credits, so final results can change when state deductions, credits, or residency allocation apply.

Does South Carolina tax retirement income?

South Carolina retirement income treatment can depend on the income type, age, and state exclusions. Use the South Carolina retirement tax checker for a state-specific review.

Does South Carolina tax Social Security benefits?

South Carolina Social Security treatment can differ from federal treatment. Use the South Carolina Social Security checker and verify the result with the official state source.

When will I get my South Carolina tax refund?

South Carolina refund timing depends on e-file versus paper filing, direct deposit, return accuracy, identity verification, and seasonal volume. Use the South Carolina refund timeline estimator and the official refund-status source for live updates.

Where should I verify my South Carolina tax result?

Use the official South Carolina revenue or tax agency sources linked in the sources section. TaxGuide Pro is an educational estimator and does not replace a filed state return or agency notice.

Last updated & sources

Last updated August 20, 2026.

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