Sole Proprietorship in Michigan (2026)

Fact-checked by the LegalGlass editorial team against primary sources · Published Aug 6, 2026 · Last updated Aug 6, 2026

Starting a sole proprietorship in Michigan costs $0 in state formation fees, because Michigan does not register sole proprietors - the business exists as soon as you begin work. If you use a business name, you register a assumed name (DBA), and you pay 15.3% self-employment tax plus Michigan income tax on your profit. A sole proprietorship gives no liability protection.

What a Michigan Sole Proprietorship Is

A sole proprietorship is the simplest business structure and the default whenever one person does business without forming a separate entity. There is no legal separation between you and the business: you own all the assets, keep all the profit, and are personally responsible for every debt and liability. Unlike a Michigan LLC or a corporation, it is not created by filing formation documents - it exists the moment you start doing business.

Freelancers, independent contractors, online sellers, and single-owner side businesses in Michigan are sole proprietors by default. The trade-off for the simplicity is that the structure provides no liability shield, which is why many owners eventually convert to an LLC.

For the national picture, see what is a sole proprietorship and compare it against other structures. The rest of this guide covers the Michigan-specific steps a sole proprietor still has to handle even without a formation filing.

No State Formation Filing Required in Michigan

To operate as a sole proprietor in Michigan, you do not register the business itself with the Michigan Department of Licensing and Regulatory Affairs (LARA). That office records formal entities - LLCs, corporations, and limited partnerships - not sole proprietorships. There are no articles to file, no formation fee, and no registered agent requirement for the sole proprietorship as an entity.

That said, "no formation filing" does not mean "no obligations." You may still need to register a business name, obtain tax accounts, and secure licenses, all covered below. Skipping those steps is a common way sole proprietors run into trouble with banks, tax authorities, or local regulators.

If you want liability protection or a formal entity name on the state register, forming an LLC in Michigan is the alternative to remaining a sole proprietor. You can check existing entity names with the Michigan business entity search.

Registering a Business Name (assumed name (DBA)) in Michigan

If you operate under a name other than your own legal name, Michigan requires you to register a assumed name (DBA). In Michigan a sole proprietor files an assumed name certificate (a "doing business as" filing) with the county clerk in the county where the business operates, not with the state. This is a name registration only - it does not create a separate legal entity and does not grant trademark rights.

Registering the name lets you bank and contract under it and puts customers on notice of who is behind the business. For the general concept, see what is a DBA and the Michigan DBA filing guide.

If you want to stop competitors from using your brand, name registration is not enough; consider a state or federal trademark. Confirm your chosen name is distinguishable and clear of existing marks before you print signage or launch a website.

EIN and Federal Income Tax

The IRS treats a sole proprietorship as a disregarded activity of the owner: you report business income and expenses on Schedule C attached to your personal Form 1040, and the net profit flows to your individual return. You generally do not need a federal EIN and may use your Social Security Number, unless you hire employees, file excise or pension returns, or elect corporate tax treatment.

Even when not required, many sole proprietors get a free EIN from the IRS to keep the SSN off business paperwork and to open a business bank account. Because no tax is withheld from your profit, you typically pay estimated taxes quarterly using Form 1040-ES.

If your profit grows, review whether an S-corporation election (which requires first having an eligible entity such as an LLC or corporation) could reduce self-employment tax. As a bare sole proprietor, all of your net profit is exposed to that tax.

Self-Employment Tax

Sole proprietors pay self-employment tax on their net business earnings to cover Social Security and Medicare. The combined rate is 15.3% - 12.4% for Social Security up to the annual wage base, plus 2.9% for Medicare with no cap. The tax is computed on Schedule SE, and you can deduct one-half of it when figuring adjusted gross income.

Because employees split these taxes with an employer, a sole proprietor effectively pays both halves. Budgeting for the 15.3% on top of income tax is the single most common surprise for new Michigan sole proprietors, and it applies even if deductions leave you owing little income tax.

High earners also owe the 0.9% Additional Medicare Tax above $200,000 (single) or $250,000 (married filing jointly). Try the self-employment tax calculator to estimate what you will owe and set money aside each quarter.

Michigan State Taxes and Licenses

Michigan taxes sole-proprietor profit as personal income at a flat individual income tax rate (about 4.25%; confirm the current rate with Treasury). If you sell taxable goods, you must register with the Michigan Department of Treasury for sales tax before making sales. Rates and registration are handled by the Michigan Department of Treasury.

Michigan has no single statewide general business license. Many cities, counties, and regulated professions require their own licenses or permits, so confirm local requirements for your specific activity and location. See business licenses in Michigan and the national business license overview for how to check.

Keep your federal and state obligations aligned: use the same business name across your DBA, tax accounts, and licenses so filings match. Set aside for both federal (income plus 15.3% SE tax) and state tax, and pay estimates on time to avoid penalties.

Liability, and When to Form an LLC

The defining feature of a sole proprietorship is unlimited personal liability. Because there is no separate entity, a business debt or lawsuit can reach your personal savings, home, and other assets. Business insurance helps, but it does not create the legal separation that an LLC or corporation provides.

This is why owners in higher-risk fields, or those signing leases and taking on contracts, often form an LLC. Compare the two in sole proprietorship vs LLC and, when you are ready, read how to form an LLC in Michigan.

Closing a sole proprietorship is equally informal: there is no state dissolution filing. You stop operating, cancel any assumed name (DBA) registration and licenses, file your final Schedule C and pay any tax due, and close your tax accounts. If you had an EIN, notify the IRS that the business has closed.

Frequently Asked Questions

Do I have to register a sole proprietorship with the Michigan Department of Licensing and Regulatory Affairs (LARA)?

No. Michigan does not register sole proprietorships; that office records LLCs and corporations. Your sole proprietorship exists automatically when you start doing business. You may still need a assumed name (DBA), tax accounts, and local licenses.

How do I register a business name for a sole proprietorship in Michigan?

If you use a name other than your legal name, register a assumed name (DBA). In Michigan the assumed name is filed with the county clerk where you do business. It is a name registration only and does not create a separate legal entity or grant trademark rights.

Do I need an EIN for a Michigan sole proprietorship?

Not usually. A sole proprietor with no employees can use a Social Security Number. You need a free EIN from the IRS if you hire employees, file excise or pension returns, or elect corporate tax treatment. Many owners still get one to avoid using their SSN.

What taxes does a Michigan sole proprietor pay?

Federal income tax on Schedule C, self-employment tax of 15.3% on Schedule SE, and Michigan flat individual income tax (about 4.25%); register with Treasury for sales tax if you sell taxable goods. You typically pay federal and state estimated taxes quarterly because nothing is withheld from your profit.

Does a sole proprietorship protect my personal assets?

No. A sole proprietorship gives no liability protection, so business debts and lawsuits can reach your personal assets. To separate business and personal liability, form an LLC or corporation. Business insurance reduces risk but does not create legal separation.

How do I close a sole proprietorship in Michigan?

There is no state dissolution filing. Stop operating, cancel your assumed name (DBA) and any licenses, file a final Schedule C and pay remaining tax, and close your Michigan tax accounts. If you had an EIN, notify the IRS that the business has closed.

Related

• What is a sole proprietorship? (cluster hub)
• What is a DBA?
• How to get an EIN
• Self-employment tax in Michigan
• How to form an LLC in Michigan
• Sole proprietorship vs LLC

Sources

1. Michigan Department of Licensing and Regulatory Affairs - Corporations, Securities & Commercial Licensing (entities file here).
2. IRS - Sole Proprietorships (federal tax treatment).
3. IRS - Get an Employer Identification Number (EIN is free from the IRS).
4. IRS - About Schedule C (Form 1040) (profit or loss from business).
5. IRS - About Schedule SE (Form 1040) (self-employment tax).
6. IRS - Self-Employment Tax (Social Security and Medicare Taxes) (15.3% combined rate; $400 threshold).
7. IRS - Estimated Taxes (quarterly due dates).
8. IRS - About Form 1040-ES (Estimated Tax for Individuals).
9. IRS - Starting a Business (federal checklist).
10. Social Security Administration - Contribution and Benefit Base ($176,100 Social Security wage base for 2025; adjusted annually).
11. Cornell LII - Sole proprietorship (Wex).
12. Cornell LII - 26 U.S. Code § 1402, Net earnings from self-employment.
13. Michigan Department of Treasury - Business Taxes (registration and sales tax).
14. Michigan Department of Treasury - Individual Income Tax (flat rate).
15. Justia - Michigan Compiled Laws (assumed names, MCL 445.1).

LegalGlass provides general information for educational purposes and is not a law firm or a substitute for advice from a licensed attorney or tax professional. Laws, fees, and thresholds change; verify current requirements with the relevant state agency and the IRS before acting.