Missouri Self-Employment Tax Calculator

On top of the 15.3% federal SE tax and federal income tax, you also owe Missouri state income tax on your net profit. Most self-employed people in Missouri should set aside roughly 25%–30% of net profit. Enter your income and expenses above for an exact Missouri estimate and your quarterly payment.

A common rule of thumb is to set aside 25%–30% of your net self-employment income for taxes, but the right number depends on your total income, filing status, and state. It covers three things: self-employment (SE) tax of 15.3%, federal income tax, and any state income tax. Enter your income above and the calculator shows your exact set-aside percentage and the amount per quarter.

The self-employment tax rate is 15.3% — 12.4% for Social Security plus 2.9% for Medicare. It applies to 92.35% of your net profit (not the full amount), and the Social Security portion only applies up to the annual wage base. High earners pay an extra 0.9% Medicare surtax above $200,000. SE tax is separate from, and on top of, income tax.

As a W-2 employee, your employer pays half of your Social Security and Medicare (7.65%) and withholds income tax from each paycheck. As a 1099 contractor you're both employer and employee, so you pay the full 15.3% SE tax yourself — and no tax is withheld, so you make quarterly estimated payments. You can deduct half of the SE tax and your business expenses, which softens the difference.

Generally yes. If you expect to owe $1,000 or more, the IRS wants estimated tax paid in four installments (typically April 15, June 15, September 15, and January 15). Missing them can trigger an underpayment penalty. The calculator divides your estimated annual tax into four equal payments so you know what to send each quarter.

Ordinary and necessary business expenses — supplies, software, mileage, a home office, health insurance premiums, and retirement contributions — reduce your net profit, and SE tax is charged on profit, so every deductible dollar cuts both SE and income tax. On the income-tax side you may also qualify for the 20% Qualified Business Income (QBI) deduction. Enter your expenses above to see the effect.

No — treat them as planning estimates. They use 2026 federal brackets and representative state income tax, apply the standard deduction, and simplify QBI and the additional-Medicare threshold. Your actual return depends on other income, credits, and deductions. Use this to size your quarterly payments, and confirm with a tax professional or the IRS forms (Schedule C, Schedule SE, Form 1040-ES).