How the 2026 estimate works
Enter net business profit after eligible business expenses, plus other ordinary income before deductions, excluding business profit and capital gains. Include W-2 wages in that other-income amount. The calculator applies the 92.35% net-earnings adjustment and generally calculates self-employment tax only when net earnings reach $400. It then applies the 12.4% Social Security portion subject to the 2026 $184,500 individual wage base and the 2.9% Medicare portion. Only your own W-2 Box 3 wages reduce your Social Security wage base; a spouse's wages do not.
The income-tax estimate adds business profit and other ordinary income, subtracts one-half of regular self-employment tax, and applies the 2026 standard deduction and progressive federal ordinary-income brackets for the selected status: $16,100 for single, $32,200 for married filing jointly, or $24,150 for head of household. W-2 Box 5 wages and self-employment net earnings are also checked against the 0.9% Additional Medicare Tax threshold ($200,000 for single or head of household; $250,000 for married filing jointly). For a joint return, enter both spouses' Box 5 Medicare wages. The estimate does not subtract Additional Medicare Tax withholding.
This is a scoped planning estimate, not a complete tax-return calculation. It excludes the qualified business income deduction, credits, itemized deductions, preferential-rate income, state and local tax, withholding, estimated payments, and special rules. Verify the current IRS instructions and your full facts before making filing or payment decisions.
Interpret each result
Self-employment tax combines the Social Security and Medicare components calculated on net earnings. Additional Medicare Tax is shown separately. Ordinary federal income tax is calculated on a simplified taxable-income amount using 2026 brackets. The combined result estimates these income- and self-employment-tax components before withholding and payments; it does not include regular Social Security and Medicare tax on W-2 wages and is not a bill or balance due.
For example, with $50,000 of net profit, single filing status, no other ordinary income or W-2 wages, and no credits or other deductions, the model estimates about $7,065 of regular self-employment tax and about $3,396 of ordinary federal income tax, or approximately $10,461 combined. This example uses the calculator's 2026 assumptions and is not a prediction for any individual return.
Common mistakes to avoid
Do not enter gross receipts as profit. Start with business income less expenses that are deductible under the rules for your activity; personal transfers and loan proceeds are not a substitute for that calculation.
Do not overlook W-2 wages when checking the Social Security wage base or Additional Medicare Tax threshold. Use the applicable W-2 wage boxes and include both spouses' wages for a joint return.
Do not read the estimate as a balance due. It does not subtract withholding or estimated payments and omits credits, the qualified business income deduction, itemized deductions, and state tax.
Planning beyond the estimate
Keep records of income and deductible expenses throughout the year, and revisit your estimate at least quarterly. Self-employed taxpayers may need estimated payments; the rules depend on expected tax, withholding, and prior-year facts. A tax professional can help identify deductions and safe-harbor payment rules that a simple tool cannot assess.
For a more complete picture, pair this estimate with the quarterly tax estimator and expense tracker. Together they can help you maintain a reserve and notice changes early, while your accounting records remain the source of truth.
Turn an estimate into a steady tax routine
A useful estimate starts with a useful profit forecast. Compare invoices issued with cash collected, then account for refunds, platform fees, and expenses that belong to the same period. If your books use a different accounting method, follow that method consistently instead of assuming every cash movement is taxable income or a deductible cost.
The filing-status choice selects the 2026 standard deduction, ordinary-income brackets, and Additional Medicare Tax threshold used by this estimate. Filing status depends on your household facts and current law; the calculator cannot determine eligibility. Its model still omits credits, the qualified business income deduction, itemized deductions, preferential-rate income, and other return-specific adjustments.
Self-employment tax and income tax answer different questions. One relates to Social Security and Medicare contributions on self-employment earnings; the other is based on taxable income after applicable adjustments and deductions. A displayed combined estimate is helpful for budgeting, but the categories should not be confused with the final lines on a return.
If you have W-2 wages, enter your own Social Security wages from Box 3 and include those wages in other ordinary income. For married filing jointly, combine both spouses' Medicare wages from Box 5 for the Additional Medicare Tax threshold; for other statuses, use your own Box 5 wages. This estimate does not calculate withholding or a balance due. Retirement contributions, other businesses, and credits can also affect household tax.
Set a reminder to revisit the estimate after a large project, a new recurring client, a substantial purchase, or a change in work schedule. An update does not have to predict the exact return; it helps make the reserve more responsive to the business you are actually running and helps you spot questions early.
Frequently asked questions
Is this the amount I will owe the IRS?
No. It is a planning estimate with simplified assumptions. Your return can include other income, deductions, credits, state taxes, and limits not modeled here.
What counts as net profit?
In general, business income less eligible business expenses. Use bookkeeping records and tax guidance to determine which expenses qualify.
Why is only 92.35% used for self-employment tax?
The standard U.S. self-employment tax calculation applies the tax rate to 92.35% of net profit to account for the employer-equivalent adjustment.
Does this include state taxes?
No. Tax rules vary by state and jurisdiction, so add a separate reserve based on your location and circumstances.
Does the estimate include the 2026 wage base and brackets?
Yes. It uses a $184,500 individual Social Security wage base, the 2026 standard deduction and ordinary-income brackets, and the filing-status threshold for Additional Medicare Tax. It also applies the general $400 net-earnings threshold for self-employment tax. W-2 Box 3 wages are individual; for married filing jointly, Box 5 Medicare wages are combined for the Additional Medicare Tax threshold.
Does this show my remaining balance due?
No. Withholding and estimated payments are not deducted. The estimate covers the modeled income-tax, self-employment-tax, and Additional Medicare Tax amounts; it excludes regular Social Security and Medicare tax on W-2 wages, state tax, credits, and several deductions.
Can I enter income from two self-employed spouses or businesses?
No. The self-employment calculation models one taxpayer's net business profit. Each person's Social Security wage base and self-employment tax must be calculated separately; this tool does not combine multiple businesses or a spouse's self-employment tax.
This page is educational information, not individualized tax, legal, or financial advice. Verify current rules with the relevant authority or a qualified professional.
Official sources and further reading
Use current official guidance to confirm rules for your circumstances: