1099 Self-Employment Tax Calculator
Estimate federal income tax, self-employment tax and quarterly payments after business expenses.
What this calculator explains
Independent contractors generally do not have an employer withholding federal income tax or paying the employer share of Social Security and Medicare. The calculation therefore starts with net business profit—not gross receipts—and estimates self-employment tax separately from income tax.
The annual liability and the suggested estimated-payment schedule appear as separate results. Quarterly amounts can change because of household income, employee withholding, tax credits, state tax and payments already made.
How the estimate is calculated
- Subtract eligible business expenses from gross receipts to estimate net profit.
- Apply the IRS self-employment earnings adjustment to the portion subject to self-employment tax.
- Calculate Social Security and Medicare components while respecting the wage base and any wage income already entered.
- Deduct the allowable portion of self-employment tax when estimating adjusted income.
- Apply current federal brackets and the selected deduction method, then add a supported state estimate.
- Subtract withholding and prior payments before dividing the remaining projected obligation into planning installments.
Formula
Net profit = gross business income − deductible business expenses; self-employment tax base is generally 92.35% of net earnings, subject to applicable limits
Worked example
A freelancer receives $90,000 and has $20,000 of deductible business expenses, producing $70,000 of net profit. Using the general 92.35% adjustment, approximately $64,645 is subject to the self-employment tax calculation. At 15.3%, the illustrative self-employment tax is about $9,890.69 before considering the Social Security wage base, other wages or Additional Medicare Tax. Federal and state income tax must then be calculated separately.
Current rules and configuration notes
- Self-employment tax usually applies when net earnings from self-employment are $400 or more.
- The amount subject to self-employment tax is generally 92.35% of net self-employment earnings.
- The 12.4% Social Security portion is limited by the 2026 Social Security wage base of $184,500 after considering covered wages; the Medicare portion follows separate rules.
- Quarterly estimated payments depend on the user’s full tax position, withholding, credits and prior payments—not business profit alone.
Update requirement: Review federal brackets, Social Security wage base, estimated-payment guidance and every supported state module annually.
Included in the estimate
- Gross receipts and deductible business expenses
- Self-employment Social Security and Medicare components
- Interaction with wage income for the Social Security wage base
- Federal income-tax estimate and supported state estimate
- Withholding, prior estimated payments and a reserve target
- Annual and quarterly planning views
Not included or not guaranteed
- Preparation or filing of Schedule C, Schedule SE or Form 1040-ES
- Entity-specific S corporation or partnership tax calculations
- Qualified business income deduction in every complex circumstance
- International, multi-state or local business-tax obligations
- A determination that an expense is legally deductible
Frequently asked questions
What income should I enter?
Enter all gross business receipts, not only amounts reported on Form 1099. Taxable business income can exist even when a client does not issue a form.
What expenses can reduce net profit?
Enter ordinary and necessary business expenses only. Do not include personal spending, and review uncertain items with a qualified tax professional.
Why is self-employment tax different from income tax?
Self-employment tax generally funds Social Security and Medicare. Federal and state income taxes are calculated separately after applicable adjustments and deductions.
Do I need to make quarterly estimated payments?
You may need estimated payments when withholding and credits will not cover enough of the projected tax. Check IRS safe-harbor rules and due dates before relying on the suggested schedule.
Does the calculator include state tax?
It can provide an estimate for supported states, but state filing rules, local taxes and business fees may require separate treatment.
Can an LLC use this calculator?
A single-member LLC taxed as a sole proprietorship may use it as a planning tool. Different tax elections or multiple owners require a different model.
Official sources
Applicable period: 2026 · Last reviewed: September 3, 2026
- IRS Topic No. 554 — Self-employment tax
- IRS — Estimated taxes
- Social Security Administration — Contribution and Benefit Base
- IRS — Tax inflation adjustments for tax year 2026
Display the applicable period and a real Last reviewed date beside this source list.
Recommended internal links
Turn the estimate into a cash-flow plan
Save the annual scenario, set a quarterly reserve and compare how business expenses or retirement contributions change the estimate.
CTA destination: /us/pay-and-tax/1099-self-employment-tax-calculator/