Self-Employment Tax in Michigan (2026)

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

If you are self-employed in Michigan you pay the federal self-employment (SE) tax of 15.3% on net earnings — 12.4% for Social Security up to the annual wage base plus 2.9% for Medicare with no cap — reported on Schedule SE with Form 1040. Michigan levies no separate self-employment tax; your net profit instead flows onto your Michigan individual income tax return filed with the Michigan Department of Treasury, and roughly two dozen Michigan cities add a local income tax.

What Self-Employment Tax Is in Michigan

Self-employment tax is the Social Security and Medicare tax paid by people who work for themselves. As an employee, you and your employer each cover half of these payroll taxes and the amounts leave every paycheck automatically. When you are self-employed — a sole proprietor, an independent contractor, a partner, or the owner of a single-member Michigan LLC taxed as a disregarded entity — there is no employer to cover half, so you pay both halves. The combined rate is 15.3% of net earnings from self-employment. It is a federal tax imposed by 26 U.S. Code § 1401 and collected by the IRS, entirely separate from federal and Michigan income tax, and it funds your own future Social Security and Medicare benefits.

The 15.3% splits into 12.4% for Social Security (old-age, survivors, and disability insurance) and 2.9% for Medicare hospital insurance. The Social Security portion applies only up to the annual Social Security wage base published by the Social Security Administration; once your combined wages and self-employment earnings reach that ceiling, no further 12.4% is due for the year. The Medicare portion has no ceiling and applies to every dollar of net earnings. Because the tax attaches to earnings rather than to residence, a freelancer in Michigan owes exactly the same federal SE tax as one in any other state. Use our self-employment tax calculator to estimate the number.

How Net Earnings Are Calculated

You do not pay SE tax on gross revenue. You pay it on net earnings from self-employment, defined in 26 U.S. Code § 1402. In practice you start with net profit from the business — usually the bottom line of Schedule C — and multiply it by 92.35% before applying the 15.3% rate. That factor accounts for the employer-equivalent half of the tax. If net earnings from self-employment are below $400 for the year, you generally owe no SE tax and do not file Schedule SE.

The tax is computed on Schedule SE (Form 1040), and multiple businesses are combined on a single Schedule SE. Partners in a Michigan partnership report their distributive share of self-employment earnings from Schedule K-1. Rental income and most investment income are not subject to SE tax, and neither are wages you already receive as an employee — those were taxed through payroll withholding instead. Ordinary and necessary business expenses reduce net profit and therefore reduce SE tax directly, which is why disciplined expense tracking is worth real money.

The Additional Medicare Tax

High earners owe an extra 0.9% Additional Medicare Tax on combined wages and self-employment income above a threshold: $200,000 for single filers, $250,000 for married filing jointly, and $125,000 for married filing separately. The surtax sits on top of the regular 2.9% Medicare portion, so the marginal Medicare rate reaches 3.8% above the threshold. Unlike the base self-employment tax it is not split with anyone — it is a tax on you as the earner, reconciled on Form 8959 with your Form 1040. The thresholds are not indexed for inflation, so more taxpayers cross them each year.

The Deduction for One-Half of SE Tax

Because employees never pay income tax on the employer half of payroll taxes, the tax code lets self-employed people deduct one-half of their self-employment tax as an above-the-line adjustment to income on Form 1040. The deduction lowers federal taxable income — and, in states that start from federal figures, state taxable income — but it does not reduce the SE tax itself. You can take it even if you claim the standard deduction. Self-employed people may also deduct qualifying health insurance premiums and contributions to a SEP-IRA or Solo 401(k), which further reduce income tax but again leave the 15.3% SE tax untouched.

Quarterly Estimated Payments

Because no employer withholds from your pay, the IRS expects most self-employed people to make quarterly estimated tax payments covering income tax and self-employment tax together. You use Form 1040-ES, and the four federal installments are generally due April 15, June 15, September 15, and January 15 of the following year. Underpaying triggers an IRS underpayment penalty even if you settle the balance in April. Michigan generally requires its own estimated income tax payments on a parallel quarterly schedule when enough tax is not otherwise withheld, and residents of Michigan cities with a local income tax may owe city estimates as well. Check the current thresholds with the Michigan Department of Treasury and your city treasurer, and keep an EIN and clean records so the quarterly math is accurate.

Michigan State Tax on Self-Employment Income

Michigan imposes a flat-rate individual income tax administered by the Michigan Department of Treasury, and your business profit is reported on the Michigan MI-1040. Because Michigan law contains a statutory rate-reduction mechanism that can move the rate from year to year, confirm the current rate with the Department of Treasury before you compute estimates rather than reusing last year's figure. Michigan also allows a number of cities to levy a local income tax on residents and on income earned in the city, which is a real cost for self-employed people working in Detroit, Grand Rapids, Lansing, and other city-tax jurisdictions. There is no separate Michigan self-employment tax, and Social Security and Medicare are federal programs, so the 15.3% is identical wherever you live; what differs by state is the income tax layered on top. If you also sell taxable goods you must register for Michigan sales and use tax. Once profit is high, weigh whether an S-corporation election could cut the Social Security and Medicare portion by splitting income into a reasonable salary plus distributions; see also forming a Michigan LLC and Michigan LLC tax filing.

Reducing the Bite: Retirement and Health Deductions

You cannot avoid self-employment tax on net earnings, but you can shrink the income tax that stacks on top of it. Self-employed people in Michigan can deduct contributions to a SEP-IRA, a SIMPLE IRA, or a Solo 401(k), often sheltering a large share of profit while building retirement savings. If you buy your own coverage, the self-employed health insurance deduction covers medical, dental, and qualifying long-term-care premiums for you and your family. A qualified business income (QBI) deduction of up to 20% of pass-through profit may also apply. None of these reduce the 15.3% SE tax, but together they can meaningfully lower the combined bill.

Good records make these deductions defensible. Track every ordinary and necessary expense, keep receipts, and separate business and personal accounts — easier once you have an EIN and a dedicated business bank account. Log mileage if you drive for work, and learn the home-office rules if you use part of your home exclusively for business. Sloppy records cost far more at tax time than the bookkeeping ever saves.

Common Self-Employment Tax Mistakes

The most expensive mistake is skipping quarterly estimated payments and meeting a large balance plus an underpayment penalty in April. A close second is forgetting that SE tax sits on top of income tax, so new freelancers set aside far too little; reserving roughly 25% to 30% of net profit for combined federal SE and income tax is a common starting rule before adding any Michigan tax. Others miss the deduction for one-half of SE tax, misclassify hobby income, or assume that forming an LLC eliminates the tax — it does not, because a single-member LLC is disregarded by default and every dollar of profit stays subject to the 15.3%.

Another trap is waiting too long to consider an S-corporation election. The strategy only pays once profit comfortably exceeds a reasonable salary, and the Form 2553 deadline is easy to miss. Payroll, a separate 1120-S return, and reasonable-compensation risk are the offsetting costs. Because rates, thresholds, and the Social Security wage base change annually, verify current figures with the IRS and the Michigan Department of Treasury before you file or pay.

Frequently Asked Questions

What is the self-employment tax rate in Michigan?

The federal self-employment tax rate is 15.3 percent of net earnings: 12.4 percent Social Security up to the annual wage base plus 2.9 percent Medicare with no cap. Michigan adds no separate SE tax, only its flat individual income tax on your profit, and some Michigan cities add a local income tax.

Do Michigan cities tax self-employment income?

Some do. Roughly two dozen Michigan cities levy a local income tax on residents and on income earned within the city, which applies to self-employment profit. Detroit, Grand Rapids, and Lansing are among them. Check with your city treasurer about registration and estimated payments.

Do I owe SE tax if I also have a W-2 job?

Yes. Self-employment tax applies to your net self-employment earnings regardless of a W-2 job. Wages already covered Social Security up to the wage base, so the Social Security portion of SE tax may be reduced or eliminated, but the 2.9 percent Medicare portion still applies to all net earnings.

When do I not owe self-employment tax?

If your net earnings from self-employment are under $400 for the year, you generally owe no self-employment tax and do not file Schedule SE. Investment income and most rental income are also outside self-employment tax, as are wages already subject to payroll withholding.

Does forming an LLC in Michigan lower my self-employment tax?

Not by itself. A single-member Michigan LLC is disregarded by default, so all profit stays subject to the 15.3 percent tax. Electing S-corporation treatment can reduce it by splitting income into a reasonable salary plus distributions, but adds payroll and a separate return.

How do I pay self-employment tax during the year?

Through quarterly estimated payments on Form 1040-ES, generally due April 15, June 15, September 15, and January 15. At year end you reconcile the total on Schedule SE filed with Form 1040. Michigan and any city tax generally need their own estimates.

Related

• Small business tax overview (cluster hub)
• Michigan LLC tax filing requirements
• How to form an LLC in Michigan
• Single-member LLC in Michigan
• Sole proprietorship in Michigan
• S-corp vs LLC: which lowers SE tax?
• Self-employment tax calculator
• How to get an EIN
• Business and tax glossary

Sources

2. IRS — Self-Employment Tax (Social Security and Medicare Taxes) (15.3% rate; $400 filing threshold).
4. IRS — About Schedule SE (Form 1040), Self-Employment Tax.
6. IRS — About Schedule C (Form 1040), Profit or Loss From Business.
8. IRS — Estimated Taxes (quarterly payments).
10. IRS — About Form 1040-ES, Estimated Tax for Individuals.
12. IRS — Questions and Answers for the Additional Medicare Tax (0.9% surtax).
14. IRS — Business Structures.
16. IRS — Single Member Limited Liability Companies (disregarded-entity default).
18. IRS — About Form 2553, Election by a Small Business Corporation.
20. Cornell Legal Information Institute — 26 U.S. Code § 1401 — Rate of tax.
22. Cornell Legal Information Institute — 26 U.S. Code § 1402 — Definitions.
24. Social Security Administration — Contribution and Benefit Base (annual Social Security wage base).
26. Michigan Department of Treasury — New Business Registration.
28. Michigan Department of Treasury — Sales and Use Tax.
30. Michigan LARA — Corporations Division, Limited Liability Companies.

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 requirements with the IRS and the Michigan Department of Treasury before acting.