How to Convert a Sole Proprietorship to an LLC in Michigan (Step by Step)

There is no form in Michigan that “converts” a sole proprietorship into an LLC. A sole proprietorship isn’t a registered entity — it’s just you, doing business — so there’s nothing on file with the state to amend. When people say they want to convert a sole proprietorship to an LLC in Michigan, what actually happens is this: you form a brand-new LLC with LARA, then move the business’s assets, contracts, accounts, and licenses into it, and stop operating in your own name.

That distinction matters, because the second half — the moving — is where most people get sloppy. Filing Articles of Organization takes twenty minutes. Making sure your client contracts, bank account, insurance, and sales tax registration actually sit with the LLC is what determines whether the liability shield holds up when you need it.

Here’s the whole process, in order, with the Michigan-specific details.

Step 1: Confirm the LLC is actually worth it for you

Before you spend the $50, be honest about why you’re doing it. The liability protection in the Michigan Limited Liability Company Act (MCL 450.4101 et seq.) is real, but it protects you from business liabilities — a slip-and-fall at your shop, a vendor you can’t pay, a contract you breach. It does not protect you from your own negligence or from debts you personally guarantee. If your main exposure is professional malpractice, insurance does more work than an entity does.

The cases where converting pays off fastest: you’ve started hiring, you’re signing leases or multi-year contracts, you’ve taken on a loan, you own equipment or vehicles used in the business, or a client or landlord is asking you to produce an entity and a certificate of insurance. If you’re still weighing it, our breakdown of Michigan LLC vs. sole proprietorship compares the tax treatment, paperwork, and liability side by side.

Step 2: Pick a name that clears LARA’s database

Your name has to include an LLC designator (“Limited Liability Company,” “L.L.C.,” or “LLC”) and must be distinguishable from every other entity on file with LARA’s Corporations Division (see MCL 450.4204 on name requirements). Search the state’s business entity database before you commit.

Two things trip up converting sole proprietors:

Your county DBA doesn’t reserve anything statewide. If you filed a certificate of assumed name with your county clerk as a sole proprietor, that gave you no protection against an LLC in another county using the same name.
You may want the LLC to keep trading under the old name. If “Lakeshore Lawn & Snow” is on every truck and invoice, you can form “Lakeshore Outdoor Services LLC” and then file a Certificate of Assumed Name with LARA (currently $25, good for five years) so the LLC can legally do business as the familiar name. Trades like lawn care and cleaning businesses do this constantly to avoid reprinting everything.

Step 3: File Articles of Organization with LARA

This is the actual formation step. File Form CSCL/CD-700 through the MiBusiness Registry portal, LARA’s online filing system. The fee is $50. Standard online processing is usually quick; if you need it faster — say a closing or a contract signing is pending — LARA offers 24-hour expedited review for an additional $50.

The Articles require the company name, the purpose, the duration (leave blank for perpetual), and your resident agent and registered office address in Michigan. The contents are spelled out in MCL 450.4203.

That registered office goes on the public record. If you’ve been running the sole proprietorship from your house, this is the moment to decide whether you want your home address searchable on a state website forever — our guide to choosing a Michigan registered agent walks through the tradeoffs.

The Articles also let you specify a later effective date rather than the filing date, which is the lever you pull if you want a clean January 1 start. More on that below.

Step 4: Write an operating agreement

Michigan’s Act treats an operating agreement as a written document — a verbal understanding between co-owners doesn’t do the job. Even as a single member, write one. It’s the document that shows the LLC exists as something separate from you, which is exactly what a creditor’s attorney will attack if they ever try to pierce the veil.

For a converting sole proprietor, the operating agreement should specifically record your initial capital contribution: the equipment, tools, inventory, vehicles, domain names, and client lists you’re transferring in from the sole proprietorship. Pair it with a short bill of sale listing those assets. That paper trail establishes the LLC’s basis in the property and proves the assets aren’t still personally yours.

Step 5: Deal with your EIN

This is the question that generates the most confusion, so here’s the plain version.

Your situation	New EIN needed?
Sole proprietor with an EIN → single-member LLC, taxed as a disregarded entity	Not strictly required by the IRS for income tax, but get one anyway (see below)
Sole proprietor with no EIN (used your SSN) → single-member LLC	Yes, if you’ll have employees, file excise taxes, or want a business bank account
Sole proprietor → LLC taxed as an S corporation	Yes — new EIN in the LLC’s name
Sole proprietor → multi-member LLC (you bring in a partner/spouse as a member)	Yes — the business is now a partnership for tax purposes

Even in the first row, where the IRS might let you keep the old number, practically everyone should get a fresh EIN in the LLC’s exact legal name. Banks will not open an account where the EIN name and the entity name disagree. Clients issuing 1099s match the name and number against IRS records, and mismatches generate B-notices. Payroll providers and merchant processors do the same check. A new EIN costs nothing and takes minutes — or we’ll handle it as part of our EIN filing service.

After you have the LLC’s EIN, update your Michigan Treasury registration. Sales tax licenses, withholding accounts, and use tax accounts are tied to a legal entity, not to a business name. Go into Michigan Treasury Online and register the new entity, then close out the sole proprietorship accounts so the state stops expecting returns from a business that no longer exists. Missing this step is the single most common cause of nuisance notices in year one.

Step 6: Move contracts, accounts, and licenses

Your LLC is not automatically a party to anything you signed personally. Work through this list:

Bank account. Open a new business account in the LLC’s name with the new EIN. Do not keep running revenue through the old account — commingling is the fastest way to lose the liability shield you just paid for.
Existing contracts. Check each one for an anti-assignment clause. Where there isn’t one, a short written assignment moves the contract to the LLC. Where there is one — or where the counterparty is important — ask for a novation, which substitutes the LLC as the party and releases you. Leases and equipment financing almost always require landlord or lender consent, and lenders frequently want your personal guarantee anyway.
New contracts going forward. Sign as “Jane Doe, Member, Doe Consulting LLC” — never just “Jane Doe.” Update your invoice templates, proposals, and email signature the same week.
W-9s. Send updated W-9s to every client who pays you, showing the LLC’s name and EIN. Do it before year-end so your 1099s come in correctly.
Insurance. Have your agent reissue the general liability, commercial auto, and any professional policies in the LLC’s name. A policy naming you personally may not respond to a claim against the LLC.
Occupational and trade licenses. Many Michigan licenses are issued to an individual, and the entity needs its own authorization or a qualifying officer. Residential builders, salons and shops, food service operations, and motor carriers all have entity-level requirements — this is a per-trade question, so check with the issuing agency. Our guides for contractors and truckers cover the common ones.
Titled and recorded property. Moving a vehicle into the LLC runs through the Secretary of State and can raise title and use-tax questions. Deeding real estate into an LLC can trigger property-tax uncapping and due-on-sale clauses. Talk to a Michigan attorney or CPA before you transfer either — don’t improvise. Landlords especially should get advice first.
Local presence. Update your Google Business Profile, your website footer, and your directory listings to the new legal name so clients and vendors see one consistent entity. If that’s a project you’ve been putting off, we do Google Business Profile setup and business websites.

Step 7: Calendar the annual statement

Every Michigan LLC files an annual statement with LARA by February 15, with a $25 fee. It’s a short filing confirming your resident agent and registered office. Your first one is generally due the February 15 following the year you organize; if you form in the last quarter of the year, check your filing confirmation from LARA so you know which February applies to you.

It’s a small filing with a real consequence — fall far enough behind and the LLC loses good standing, which surfaces at the worst possible moment, usually when a bank or client asks for a certificate of good standing. Set a recurring reminder, or let us handle it through our annual statement filing service.

The best time of year to convert a sole proprietorship to an LLC

The honest answer: if you have real liability exposure right now, form the LLC now. Timing optimization is worth a few hundred dollars of tax convenience; an uninsured claim against you personally is worth much more. That said, here’s how the calendar actually plays out.

Your situation	Best window	Why
Single-member LLC, staying a disregarded entity	Any time	Nothing changes federally. You still file one Schedule C for the full year. There is no short-year return and no split books required.
You want S corporation treatment this year	Form in Q4 with a January 1 effective date, or early January	Form 2553 generally must be filed within 2 months and 15 days of the start of the tax year the election takes effect — roughly mid-March for a calendar-year filer. Starting payroll on January 1 avoids prorating reasonable compensation.
You collect sales tax or run payroll	Form effective at a quarter or year boundary	Your Treasury registration changes mid-stream otherwise, which means splitting returns between two registrations in the same period.
A lease, loan, or big contract is pending	Immediately, with the $50 expedited option if needed	You want the entity in place before you sign, not after. Re-papering a signed contract is harder than signing it right the first time.
Mid-year, nothing special pending	Now, with a clean cutover date	Pick a date, open the bank account, and route everything after that date through the LLC. Clean books beat a perfect date.

The Articles of Organization let you specify a later effective date, so a December filing with a January 1 effective date is the classic move for anyone who wants a clean break in the books. The one thing to avoid is a December 31 formation followed by zero follow-through — you’ll have a $25 statement obligation and no actual operational change.

Want to see what the total first-year number looks like for your situation, including the formation fee, agent service, and annual statement? Run it through our Michigan LLC cost calculator.

Frequently Asked Questions

Do I have to close my sole proprietorship with the State of Michigan? There’s nothing to dissolve, because a sole proprietorship was never registered as an entity. What you do need to close are the accounts attached to it: your Michigan Treasury sales tax and withholding registrations, and any county assumed name certificate you no longer want, which you can let lapse or formally withdraw with the county clerk.

Can I keep my business name when I form the LLC? Usually yes, as long as the name is distinguishable from other entities on LARA’s records and you add an LLC designator. If you want the LLC to keep trading under the exact old name without “LLC” attached, file a Certificate of Assumed Name with LARA for $25, valid for five years.

Does converting mid-year mean I file two tax returns? Not for a single-member LLC that stays a disregarded entity — you file one Schedule C covering the whole year, exactly as before. It’s different if you elect S corporation treatment or add a second member, both of which create a separate return and a mid-year cutoff.

Will my existing clients’ contracts automatically transfer to the LLC? No. Contracts signed in your personal name stay with you until they’re assigned or renegotiated. Review each one for assignment restrictions, assign or novate the important ones in writing, and sign everything new in the LLC’s name.

What does it cost to make the switch? The state filing is $50, with an optional $50 for 24-hour expedited processing, plus $25 each February for the annual statement. Beyond that, costs depend on whether you use a registered agent service, need a new assumed name filing, or have licenses to re-issue.

If you’ve worked through this and you’re ready to file, we handle Michigan formations start to finish — Articles of Organization with LARA, EIN, operating agreement, and resident agent service — so the only thing left on your list is moving the contracts and accounts over. Start your Michigan LLC here, or grab the free 10-step Michigan LLC startup checklist and work through it at your own pace.