Freelancer Tax Estimator

Freelancers and self-employed individuals pay taxes differently from salaried employees. No employer withholds taxes automatically — so freelancers must estimate and pay quarterly to avoid IRS underpayment penalties.

The core quarterly tax formula: Quarterly Estimated Tax = (Net Self-Employment Income × SE Tax Rate) + Income Tax on Net Income

Step 1 — Calculate self-employment (SE) tax: SE Tax = Net Income × 0.9235 × 0.153

• The 0.9235 factor = 1 − 0.0765, which accounts for the deductible employer-equivalent half of SE tax
• 0.153 = 15.3% (12.4% Social Security + 2.9% Medicare)
• Above $160,200 (2024 limit), only the 2.9% Medicare rate applies

Step 2 — Deduct half of SE tax from income: Adjusted Gross Income = Net Income − (SE Tax ÷ 2)

Step 3 — Apply income tax brackets to the adjusted gross income.

Step 4 — Divide total by 4 for quarterly payment.

Quarterly due dates: April 15, June 15, September 15, January 15 of the following year.

Worked example: Annual net freelance income: $80,000 SE Tax = $80,000 × 0.9235 × 0.153 = $11,304 Deduction = $11,304 ÷ 2 = $5,652 Taxable income = $80,000 − $5,652 = $74,348 → approx. $12,500 income tax (single filer, 2024 brackets) Total annual tax ≈ $11,304 + $12,500 = $23,804 Quarterly payment ≈ $5,951

Safe harbor rule: Pay either 100% of prior year’s tax liability or 90% of current year’s expected liability to avoid penalties. Most freelancers set aside 25–30% of every invoice as a reliable buffer.