Will forming an LLC lower my self-employment tax in Missouri?

No, not by itself. A single-member LLC is a disregarded entity by default, so the owner still files Schedule C and Schedule SE. Only an S corporation election on Form 2553, which splits profit into reasonable salary and distributions, can change the base subject to employment taxes.

Self-Employment Tax in Missouri: Rates and Filing (2026)

Q: Does Missouri have a self-employment tax?

No. Missouri does not impose a separate self-employment tax. Self-employed Missourians pay the federal self-employment tax of 15.3% on Schedule SE and then pay Missouri individual income tax on the same profit through Form MO-1040. The top Missouri rate is 4.70% on taxable income over $9,191 for the 2025 tax year.

Q: How much is self-employment tax in Missouri?

The federal rate is 15.3%: 12.4% Social Security on net earnings up to $184,500 for 2026, plus 2.9% Medicare with no cap. Net earnings equal 92.35% of Schedule C profit. Missouri adds individual income tax on the same profit, topping out at 4.70%, so plan for both layers.

Q: When do I owe self-employment tax?

You owe federal self-employment tax once your net earnings from self-employment reach $400 for the year. That threshold applies regardless of whether a client issued a Form 1099-NEC. The tax is computed on Schedule SE and filed with your Form 1040.

Q: Do I have to make quarterly estimated payments in Missouri?

Generally yes. Federal estimates use Form 1040-ES and are due in April, June, September, and January. Missouri estimates use Form MO-1040ES on the same quarterly schedule. Missing them can trigger an underpayment penalty at both levels even if you pay the full balance at filing.

Q: Can I deduct half of my self-employment tax?

Yes. One-half of the self-employment tax computed on Schedule SE is deductible in arriving at federal adjusted gross income. Because Missouri starts from federal adjusted gross income, that deduction also flows into the Missouri calculation.

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 20, 2026 · Last updated Aug 20, 2026

Missouri does not levy a separate self-employment tax. A self-employed Missourian pays the federal self-employment tax of 15.3% - 12.4% Social Security plus 2.9% Medicare - on Schedule SE, and then pays Missouri individual income tax on the same profit, at a top rate of 4.7% on taxable income over $9,191.

Quick Answer

Federal rate: 15.3% (12.4% Social Security + 2.9% Medicare)
Social Security cap: 12.4% applies up to $184,500 of net earnings (2026)
Medicare: 2.9% on all net earnings; +0.9% above $200k single / $250k joint
Filing trigger: Net earnings from self-employment of $400 or more
Missouri tax: Individual income tax; top rate 4.7% over $9,191 taxable income
Forms: Schedule SE and Schedule C with Form 1040; Form MO-1040 and MO-1040ES

How Federal Self-Employment Tax Works

Self-employment tax is the federal Social Security and Medicare tax paid by people who work for themselves. The rate is 15.3%: 12.4% for Social Security plus 2.9% for Medicare. An employee splits those taxes with an employer; a self-employed person pays both halves, which is why the combined rate looks high.

You do not pay it on gross revenue. You pay it on net earnings from self-employment: business profit multiplied by 92.35%. The 12.4% Social Security portion applies only up to the annual wage base, which is $184,500 for 2026. The 2.9% Medicare portion applies to all net earnings with no ceiling, and an 0.9% Additional Medicare Tax applies above $200,000 of combined wages and self-employment income for single filers or $250,000 for joint filers.

You owe the tax once net earnings reach $400 for the year. It is computed on Schedule SE and attached to Form 1040, with the underlying profit computed on Schedule C. One-half of the self-employment tax is deductible in arriving at adjusted gross income, which softens the effective cost. See the national self-employment tax guide and the self-employment tax calculator.

Missouri Has No Separate Self-Employment Tax

There is no Missouri equivalent of the federal self-employment tax. The Missouri Department of Revenue does not impose a state Social Security or Medicare levy on business profit. What Missouri does tax is the profit itself, through the individual income tax under Section 143.011 RSMo.

The practical result is two layers on one number. Your Schedule C profit flows into Schedule SE for the federal 15.3%, and the same profit flows through your federal adjusted gross income onto Form MO-1040, where Missouri's graduated rates apply. Missouri does not have a city-level earnings tax statewide, but Kansas City and St. Louis each impose a local earnings tax on residents and on work performed in the city, which a self-employed person there must also account for.

Missouri Income Tax Rates on Business Profit

Missouri's individual income tax is graduated and indexed. For the 2025 tax year, filed in 2026, the top rate is 4.70%, applied to Missouri taxable income over $9,191, with lower bracket rates below that threshold. The standard deduction follows the federal amounts: $15,750 for single filers, $31,500 for married filing jointly, and $23,625 for head of household, with additional amounts for taxpayers who are 65 or older or blind.

Because the brackets are compressed, most profitable self-employed Missourians sit at or near the top rate. A useful planning number is therefore roughly 15.3% federal self-employment tax, plus federal income tax at your marginal rate, plus about 4.7% Missouri income tax on the portion above the standard deduction. Confirm the current-year figures on the Department of Revenue's income tax year changes page before you set your set-aside percentage.

Quarterly Estimated Payments - Federal and Missouri

No one withholds tax from a self-employed person's profit, so the IRS collects it through quarterly estimated payments on Form 1040-ES. Federal estimates are generally due April 15, June 15, September 15, and January 15 of the following year. Underpaying triggers an estimated-tax penalty even if the return is filed on time and the balance is paid in April.

A practical method: set aside a fixed percentage of every deposit into a separate account, and true it up each quarter as profit becomes clearer. Because self-employment tax and income tax both apply to the same profit, the set-aside percentage has to cover both. Track expenses contemporaneously - each legitimate deductible expense reduces profit, and therefore reduces self-employment tax as well as income tax.

Missouri runs a parallel system. Estimated state payments use Form MO-1040ES and follow the same quarterly rhythm as the federal schedule. If you expect to owe Missouri tax beyond withholding, paying by voucher or through the Department of Revenue's online payment system avoids a state underpayment addition.

Does Forming an LLC Reduce Self-Employment Tax?

Entity choice does not change self-employment tax by itself. A single-member LLC is a disregarded entity by default: the owner still files Schedule C and Schedule SE exactly as a sole proprietor does. Forming an LLC changes liability exposure and state filing duties, not the 15.3% rate. See what an LLC is.

The election that can change the math is the S corporation election on IRS Form 2553. An S corporation pays its owner-employee a reasonable salary subject to FICA and can distribute remaining profit without self-employment tax. The trade-off is payroll administration, a separate Form 1120-S return, and IRS scrutiny of whether the salary is genuinely reasonable. The election rarely pays for itself at low profit levels. Compare the options in S-corp vs LLC.

If you do form an entity, see how to form an LLC in Missouri, Missouri Articles of Organization, and S-corp election in Missouri. Missouri does not require LLCs to file an annual report, which keeps the ongoing compliance load lighter than in most states.

Deductions That Lower the Tax Base

Self-employment tax is charged on net earnings, so every ordinary and necessary business deduction reduces both the 15.3% and the Missouri income tax. The deductions self-employed filers most often miss are the home-office deduction, the business-use portion of a vehicle, health insurance premiums for the self-employed, and retirement contributions to a SEP-IRA or solo 401(k).

Two of those work differently. Retirement contributions and the self-employed health insurance deduction reduce income tax but not self-employment tax, because they are taken after net earnings are computed. Ordinary business expenses on Schedule C reduce both. That distinction is worth knowing before you assume a large retirement contribution will cut your Social Security and Medicare bill.

Missouri largely starts from federal adjusted gross income, so a federal Schedule C deduction generally carries into the Missouri return automatically. Keep contemporaneous records; the Department of Revenue can request substantiation for the business deductions that flowed through.

Sales Tax, Withholding, and Other Missouri Obligations

Self-employment tax is only one account. If you sell taxable goods or certain services in Missouri, you must register for a sales and use tax account with the Department of Revenue and remit on the schedule the state assigns. If you hire even one employee, you register for Missouri withholding tax and unemployment insurance, and you need a federal EIN.

Local licensing is separate again. Many Missouri cities and counties require a local business license regardless of state registration; see Missouri business license requirements. None of these replace the Schedule SE obligation - they stack on top of it.

Common Self-Employment Tax Mistakes

Assuming no 1099 means no tax. Income is reportable whether or not a payer issues Form 1099-NEC.
Skipping estimated payments in year one. The penalty applies from the first missed quarter.
Forgetting the 92.35% step. Applying 15.3% to gross profit overstates the tax.
Ignoring the deduction for half the tax. It is an above-the-line adjustment on Form 1040.
Mixing personal and business accounts. It costs deductions, which raises both taxes.
Assuming an LLC lowers the rate. It does not; only an S election changes the base.

The most expensive Missouri-specific mistake is forgetting the Kansas City or St. Louis earnings tax when you live or work in either city. It is a separate return with its own deadline, and it is not collected on Form MO-1040.

Frequently Asked Questions

Does Missouri have a self-employment tax?

No. Missouri imposes no separate self-employment tax. You pay the federal 15.3% on Schedule SE, then Missouri individual income tax on the same profit, topping out at 4.70% over $9,191.

How much is self-employment tax in Missouri?

15.3% federally: 12.4% Social Security up to $184,500 of net earnings for 2026, plus 2.9% Medicare uncapped. Net earnings are 92.35% of Schedule C profit.

When do I owe self-employment tax?

Once net earnings from self-employment reach $400 for the year, whether or not you received a Form 1099-NEC.

Do I have to make quarterly estimated payments in Missouri?

Usually. Federal estimates use Form 1040-ES; Missouri estimates use Form MO-1040ES on the same quarterly schedule.

Will forming an LLC lower my self-employment tax?

No. A single-member LLC is disregarded by default. Only an S election on Form 2553 changes the base; see S-corp election in Missouri.

Can I deduct half of my self-employment tax?

Yes, as an adjustment to federal adjusted gross income, which then flows into the Missouri return.

Sources

IRS - Self-employment tax (Social Security and Medicare taxes) (15.3% rate; 92.35%; $400 threshold).
Social Security Administration - Contribution and Benefit Base ($184,500 for 2026).
IRS - Topic no. 751, Social Security and Medicare withholding rates (0.9% Additional Medicare Tax).
IRS - About Schedule SE (Form 1040).
IRS - About Form 1040-ES (estimated tax).
IRS - About Form 2553 (S corporation election).
Missouri Department of Revenue - Individual income tax year changes (4.70% top rate; $9,191 threshold; standard deductions).
Missouri Department of Revenue - Individual income tax (Form MO-1040, MO-1040ES).
Missouri Revisor of Statutes - Section 143.011 RSMo (individual income tax imposed).
Missouri Department of Revenue - Sales and use tax.

LegalGlass provides general information for educational purposes and is not legal advice, is not a law firm, and is not a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current amounts with the IRS and the Missouri Department of Revenue before acting.