Self-Employed Tax Planning Calculator
Test a scenario before you commit: change retirement contributions, health premiums, mileage, or expenses and watch your 2026 tax bill move.
Planning beats filing. Raise the Solo 401(k) line by $5,000 and you'll see the federal tax drop immediately — that's the decision you want to make in November, not April.
Self-employed income & expenses
Estimate federal + SE + state tax for the 2026 tax year in one pass.
Estimated total tax bill
$13,930
Refund / owed
-$13,930
Effective rate
23.2%
Detailed breakdown
Mileage deduction$5,600
Total business expenses$8,100
Net self-employment income$51,900
Self-employment tax (15.3%)$7,333
½ SE deduction (above-the-line)$3,667
Adjusted gross income$48,233
Taxable income$32,133
Federal income tax$3,608
State tax (est.)$2,988
Quarterly estimated payment$3,260
Marginal rate21.3%
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