Self-Employed Tax Calculator
Estimate annual self-employment taxes and plan quarterly payments with state-aware assumptions.
Selected state
California
State
California
Estimated total annual tax
$20,236.56
Federal + state + self-employment tax
Quarterly estimate
$5,059.14
Monthly set-aside
$1,686.38
Effective tax rate
27.0%
Percent of net business income
Tax breakdownOpen details+
| Gross self-employed income | $90,000.00 |
| Business expenses | -$15,000.00 |
| Net business income | $75,000.00 |
| SE Social Security portion | $8,588.55 |
| SE Medicare portion | $2,008.61 |
| Self-employment tax | $10,597.16 |
| Federal income tax | $6,504.31 |
| State income tax | $3,135.08 |
| Total estimated annual tax | $20,236.56 |
How to use this estimateOpen details+
- Enter projected yearly income and deductible business expenses.
- Review annual and quarterly tax estimates for planning.
- Set aside the monthly amount so quarterly deadlines are easier to manage.
Separate business profit from the cash you should reserve
Self-employment tax starts with net business profit, not gross deposits. The federal calculation generally applies the Social Security and Medicare rates to 92.35% of net earnings, subject to the Social Security wage base and Additional Medicare rules. Federal and state income tax are separate layers, so reserving only 15.3% can leave a gap.
The calculator estimates those layers together and turns the annual total into quarterly and monthly planning amounts. It cannot know your complete return, spouse's income, credits, prior-year safe harbor, entity election, or every deductible expense, so reconcile the result with current bookkeeping and prior tax filings.
Worked example
$80,000 of net self-employment profit
- Approximate earnings subject to self-employment tax: $80,000 × 92.35% = $73,880.
- Self-employment tax before thresholds: $73,880 × 15.3% = about $11,304.
- One-half of self-employment tax may become an income-tax deduction.
Federal income tax and state income tax still need to be added before choosing a reserve target.
Before you rely on the result
- Subtract ordinary and necessary business expenses before entering profit.
- Include W-2 wages when checking the Social Security wage-base interaction.
- Compare the calculated payment with the prior-year safe-harbor rules.
- Update the estimate when profit changes materially during the year.
IRS Self-Employed Individuals Tax CenterOfficial filing, self-employment tax, and estimated-payment guidance.