Single Member LLC in Michigan: Taxes, Real Liability Protection, and the Mistakes That Void It

A single-member LLC in Michigan is, by default, invisible to the IRS and very much visible to creditors. Federally it’s a “disregarded entity” — your business income lands on Schedule C of your personal Form 1040, and you pay self-employment tax on the profit. Legally it’s a separate person under the Michigan Limited Liability Company Act (MCL 450.4101 et seq.), and MCL 450.4501(4) says you are not liable for the acts, debts, or obligations of the company. Those two facts pull in opposite directions, and misunderstanding either one is where one-owner businesses get hurt.

Here’s how the taxes actually work in Michigan, what the liability shield covers in practice, and the specific habits that convince a judge your LLC is just you with extra paperwork.

How a single-member LLC in Michigan is taxed

There is no separate federal or Michigan tax return for a default single-member LLC. Four layers of tax can apply, and only one of them is automatic.

1. Federal income tax. Your net profit flows to Schedule C. It’s taxed at your ordinary individual rates, combined with any W-2 wages, spouse’s income, or investment income. Forming an LLC by itself does not lower this number by a dollar.

2. Self-employment tax. This is the one that surprises new owners. You pay 15.3% on net self-employment earnings — 12.4% Social Security up to the annual wage base, plus 2.9% Medicare with no cap — through Schedule SE. Half of it is deductible against income tax, which softens the blow but doesn’t remove it. If you left a W-2 job where your employer covered half of FICA, your effective tax rate just went up even though your gross income stayed flat.

3. Michigan individual income tax. Michigan taxes the same profit at its flat individual rate (currently in the low 4% range). The LLC itself files nothing. Michigan’s 6% Corporate Income Tax applies to C corporations, not to a disregarded LLC, so there is no entity-level state tax on your ordinary operating profit.

One Michigan quirk worth knowing: the state’s flow-through entity tax election — the workaround many businesses use to deduct state tax at the entity level and sidestep the federal SALT cap — is available to partnerships and S corporations, not to disregarded single-member LLCs. If that election matters to your tax picture, it’s an argument for electing S corporation status, not for forming an LLC as-is.

4. City income tax. About two dozen Michigan cities levy their own income tax, including Detroit, Grand Rapids, Lansing, Flint, Saginaw, and Pontiac. If you live in one, work in one, or have a place of business in one, your Schedule C profit is generally in scope. Detroit taxes residents at a higher rate than nonresidents, and nonresidents owe on income earned from work performed inside the city. A Royal Oak consultant who spends three days a week on a client site in Detroit has a Detroit return to think about — see our Detroit LLC formation guide for the local filing layer.

Separately, if you sell tangible goods you’ll register for Michigan’s 6% sales tax through Michigan Treasury Online, and if you hire anyone you’ll register for withholding and unemployment insurance. Those obligations attach to the business activity, not the entity type.

Default treatment vs. S corporation election

Once profit is consistently strong, the S election becomes worth modeling. It doesn’t change your legal entity — you remain a Michigan LLC — it changes how the IRS taxes you.

	Default (disregarded)	S corporation election
Federal return	Schedule C with Form 1040	Form 1120-S, plus K-1 to you
Self-employment tax	15.3% on all net profit	Only on your W-2 wages; distributions exempt
Payroll required	No	Yes — reasonable salary, quarterly filings
Michigan FTE tax election	Not eligible	Eligible
Added annual cost	Minimal	Payroll service + more complex tax prep
Audit exposure	Standard	IRS scrutiny of “reasonable compensation”
Typical break-even	—	Often once net profit comfortably exceeds a reasonable salary for your role

The election is made on IRS Form 2553, and it requires an EIN first. Even if you stay disregarded, get an EIN anyway — Michigan banks generally want one to open a business account, and using an EIN instead of your Social Security number on W-9s keeps your SSN out of a dozen clients’ filing systems. Our EIN filing service handles it if you’d rather not deal with the IRS portal.

There’s no universal profit threshold where the S election pays off. It depends on your salary level, health insurance, retirement contributions, and how much payroll administration costs you. Run the numbers with a CPA before filing Form 2553; unwinding a bad election is annoying.

What the liability shield actually protects

MCL 450.4501(4) is short and strong: absent an exception in the Act, a member or manager isn’t personally liable for the company’s debts. In practice, that shield is real for a defined category of claims and absent for others.

Protected — claims against the business:

A vendor sues over an unpaid invoice the LLC signed for
A customer slips in your leased shop and sues over the premises
Your commercial lease goes into default after you close (assuming no personal guarantee)
An employee’s negligence injures a third party while on the job
A business loan you didn’t personally guarantee goes unpaid

Not protected — no matter how clean your paperwork:

Your own negligence or wrongful acts. If you personally installed the water heater that flooded the basement, you’re a defendant. The LLC may be a co-defendant, but it doesn’t erase your individual liability. This is why contractors and other trades need real general liability coverage, not just an entity.
Anything you personally guarantee. Landlords, SBA lenders, equipment leasing companies, and business credit cards routinely require a personal guarantee from a one-owner LLC. You signed it; it binds you.
Unpaid trust-fund taxes. Payroll taxes you withheld from employees and didn’t remit follow the “responsible person” personally at the federal level, and Michigan Treasury has parallel authority to assess responsible individuals for certain unpaid business taxes. The LLC is not a shield here.
Fraud or intentional misconduct. Misrepresenting what you’re selling is your act, not the company’s.

And note the direction the shield doesn’t run: it protects your personal assets from business creditors, not your business assets from your personal creditors. A judgment from your car accident can reach your membership interest in the LLC. The Act gives personal creditors a charging order remedy, but courts around the country have been less protective of single-member LLCs on this point than of multi-member ones, precisely because there’s no innocent co-owner to shield. Don’t buy an LLC as asset protection from your personal life.

The mistakes that void protection

Michigan courts can disregard the LLC form — “pierce the veil” — and they generally look for three things together: the entity was a mere instrumentality of the owner, it was used to commit a fraud or wrong, and the plaintiff suffered an unjust loss as a result. One sloppy month won’t do it. A pattern will. These are the patterns that show up:

Commingling funds. Running business income through your personal checking account, or paying the mortgage straight from the business account, is the single most common finding. Open a dedicated business account the week you form, move money only by documented owner draws, and never let the two touch.
Signing in your own name. Contracts, invoices, quotes, and estimates should read Great Lakes Design LLC, by Jamie Rivera, Member. Signing “Jamie Rivera” on a $40,000 contract is an invitation for the other side to argue you contracted personally.
Skipping the operating agreement. Michigan doesn’t require you to file one and doesn’t require a single-member LLC to have one. But without it, the Act’s default rules govern your company and you have no document showing the business exists as a separate entity with its own governance, capital contributions, and distribution rules. For one-owner LLCs, an operating agreement is cheap evidence of separateness. Write it, sign it, and actually follow it.
Undercapitalization. Starting with zero contributed capital, no insurance, and no reserve — then racking up obligations — reads as setting creditors up to eat a loss. Fund the business, document the contribution, and carry coverage appropriate to your work. A landlord holding rental property with no liability policy behind the LLC is exposed regardless of the entity.
Letting the entity lapse. The annual statement is the one recurring state obligation, and blowing it off has teeth.

Keeping the entity alive: Michigan’s annual requirements

Formation runs $50 for the Articles of Organization filed with LARA’s Corporations, Securities & Commercial Licensing Bureau through the MiBusiness Registry Portal. Standard review takes several business days; $50 buys 24-hour expedited processing if you need the entity on file for a bank appointment or a contract deadline. Professional LLCs (PLLCs) for licensed fields have their own article requirements and licensure verification.

After that, the ongoing cost is small and the penalty for ignoring it isn’t:

Item	Amount	When
Articles of Organization	$50	At formation
24-hour expedited review	$50 (optional)	At filing
Annual statement	$25	Every February 15
Resident agent	Varies	Continuous requirement

Under MCL 450.4207, the annual statement is due February 15 each year. If you form after September 30, you skip the February 15 immediately following and file the next year. Miss two consecutive years and the LLC is no longer in good standing and can be automatically dissolved — which means contracts signed under a dissolved entity become a live argument about who was actually on the hook. Restoration is usually possible by filing the delinquent statements and fees, but you don’t want that gap on your record when a lender pulls your certificate of good standing. Our guide to the Michigan annual statement covers the mechanics, and our annual statement filing service handles it on autopilot if February deadlines are not your strength.

Your resident agent must be a Michigan resident or an entity authorized to do business here, with a physical Michigan street address — not a P.O. box. If you move and don’t update it, service of process goes to an address you no longer check, and a default judgment can be entered before you know a lawsuit exists.

Frequently asked questions

Does a single-member LLC need an EIN if I have no employees? Not strictly for federal tax purposes — a disregarded LLC with no employees and no excise tax obligations can use the owner’s SSN. In practice, nearly every Michigan bank wants an EIN to open a business account, and using one on client W-9s keeps your Social Security number out of circulation.

Can my spouse and I own a Michigan LLC and stay a single-member LLC? No. Michigan is not a community property state, so a husband-and-wife LLC has two members and is treated as a partnership by default, filing Form 1065. That’s a meaningfully different tax return, so decide deliberately rather than by accident.

Does forming an LLC reduce my self-employment tax? Not by itself. A default single-member LLC pays the same 15.3% on net earnings that a sole proprietor pays. Only an S corporation election — with actual payroll and a defensible salary — changes that math, and it adds compliance costs that offset part of the savings.

What happens if I miss the February 15 annual statement? One missed year leaves you out of good standing and creates problems with banks, lenders, and licensing. Two consecutive missed years can result in automatic dissolution, after which you’d need to file the back statements and fees to restore the company.

Is a single-member LLC worth it for a side business earning a few thousand dollars? It depends on your liability exposure, not your revenue. A freelance writer working from a laptop has a very different risk profile than someone driving to client properties with equipment — at $50 to form and $25 a year, the cost is low enough that exposure should drive the decision.

If you’re ready to get the entity on file, our step-by-step guide to starting a Michigan LLC walks through the decisions in order, and the Michigan LLC cost calculator will show you the real first-year total before you spend anything. When you want it handled, you can start your Michigan LLC filing here — we prepare and submit the Articles of Organization with LARA and keep you on the February 15 calendar.