Self-Employment Tax Calculator
Estimate the federal payroll tax created by your freelance profit, including the 2026 Social Security cap.
How this is calculated
The calculator multiplies net business income by 92.35%, applies 12.4% Social Security tax up to the remaining 2026 wage base, applies 2.9% Medicare tax without a cap, and adds 0.9% Additional Medicare Tax above the filing-status threshold. The quarterly figure is simply the resulting SE tax divided by four.
What this estimate includes
Self-employment tax is the federal Social Security and Medicare tax paid by someone with net earnings from a trade or business. It is separate from regular federal income tax. Enter profit after ordinary business expenses, not client payments before expenses. The calculator follows the regular Schedule SE method: net income is multiplied by 92.35%, then the payroll-tax rates apply to that adjusted base.
For tax year 2026, the Social Security part is 12.4% and the Medicare part is 2.9%. Social Security applies only until combined W-2 wages and self-employment earnings reach the $184,500 contribution and benefit base. Medicare has no wage cap. These figures come from the Social Security Administration's 2026 contribution and benefit base table and IRC sections 1401 and 1402. The 2026 Schedule SE was still marked draft when reviewed, so the calculator relies on the final SSA wage-base determination and statutory rates.
An extra 0.9% Additional Medicare Tax can apply when combined Medicare wages and self-employment earnings exceed $200,000 for single, head-of-household, or qualifying-surviving-spouse filers; $250,000 for married filing jointly; or $125,000 for married filing separately. Those thresholds are not indexed. See the 2026 draft Instructions for Form 8959.
Rates current as of September 2026.
How W-2 wages change the answer
The Social Security ceiling is shared across employment and self-employment. If you already have $150,000 of Social Security wages, only $34,500 of otherwise eligible 2026 self-employment earnings can receive the 12.4% charge. The regular 2.9% Medicare calculation still uses all adjusted self-employment earnings. This tool treats the W-2 entry as both Social Security and Medicare wages; unusual wage-box differences require Form 8959 and Schedule SE directly.
The displayed deductible half is 50% of the calculated SE tax. It is generally claimed as an adjustment to income, but it is not a dollar-for-dollar credit and does not reduce SE tax. The IRS explains this distinction in Topic 554.
Worked 2026 example
Assume 2026 net freelance profit of $80,000, no W-2 wages, and single filing status. Schedule SE's 2026 method produces $73,880 of net earnings: $80,000 × 92.35%. Because that is below the 2026 $184,500 Social Security wage base, the full amount receives the 2026 12.4% Social Security tax, or $9,161.12. The 2026 2.9% Medicare part is $2,142.52. No 2026 Additional Medicare Tax applies because the combined amount is below the unchanged $200,000 single threshold. Estimated SE tax is therefore $11,303.64. The displayed deductible half is $5,651.82, and dividing only this tax into four gives $2,825.91 per payment.
Common mistakes and edge cases
- Entering gross client payments instead of net Schedule C profit overstates the base.
- Ignoring W-2 Social Security wages can charge the 2026 12.4% portion above the shared 2026 $184,500 ceiling.
- Treating the deductible half as a credit incorrectly subtracts it from tax owed.
- Assuming the quarterly shortcut includes income tax, credits, or withholding can leave a large balance.
- Farm income, partnership allocations, church income, optional methods, and community-property rules can require different Schedule SE treatment.
Using the quarterly number
Dividing SE tax by four is a planning shortcut, not the complete Form 1040-ES calculation. A real estimated payment may also include federal income tax and may be reduced by withholding or credits. Income arriving unevenly can support the annualized-income installment method instead of equal payments. Use the separate quarterly estimated tax calculator for a safe-harbor-oriented view, and reconcile the result with current Form 1040-ES.
This calculator assumes ordinary nonfarm earnings, does not implement optional Schedule SE methods, and does not model church-employee, farm, partnership, railroad, community-property, or nonresident rules. It also does not determine whether a worker is correctly classified as an independent contractor.
What to do next
Save a current profit-and-loss statement and confirm that the input matches tax profit rather than cash withdrawals. Add expected federal income tax and state tax, subtract withholding and credits, and compare the total with timely payments already made. Recalculate after a major contract or W-2 job changes the 2026 picture, then use final 2026 Schedule SE and Form 1040-ES before paying or filing.
Disclaimer: This calculator provides general information only and is not tax or legal advice. Verify your facts with the final 2026 IRS forms or a qualified tax professional before filing or paying.
Frequently asked questions
Why is only 92.35% of net profit taxed?
Schedule SE first multiplies most net self-employment earnings by 92.35%, reflecting the employer-equivalent adjustment built into IRC sections 1401 and 1402.
Does W-2 income reduce self-employment tax?
W-2 Social Security wages use part of the same annual OASDI wage base, so they can reduce the Social Security portion. They do not remove the regular Medicare portion.
Is half of SE tax refundable?
No. One-half is generally an above-the-line income adjustment on Schedule 1; it reduces income subject to income tax, not the SE tax itself.
Does this include federal income tax?
No. It estimates self-employment Social Security and Medicare taxes only. Income tax depends on deductions, credits, filing details, and other income.
When is self-employment tax required?
Schedule SE generally applies when net earnings from self-employment are at least $400, subject to special rules and optional methods.