Start with the thing almost every guide gets structurally wrong: you don't convert a sole proprietorship into an LLC. There's no conversion filing, because a sole proprietorship isn't a registered entity — it's just you, doing business. States do have statutory conversion procedures, but those move one registered entity into another (LLC → corporation, for example). A sole prop has nothing to convert.

What actually happens is simpler and has a different checklist: you form a brand-new LLC, then move the business into it — the bank account, the contracts, the licenses, the insurance, the equipment, the customer relationships. The LLC starts on the day the state says it does. Everything you did before that day was done by you personally, and stays that way forever.

The second thing most pages get wrong is the EIN. The common claim is that you must get a new one. For most single-member LLCs, the IRS says the opposite — you keep using your sole proprietor EIN. Quote and conditions below.

And the timing: it's November. If you file now with a January 1 effective date, your sole prop ends on December 31 and your LLC begins on a clean year boundary — one bank account per year, one set of books per year, and in a few states, one less annual tax bill. Filing on December 10 instead can cost you real money. That math is in here too.

This is general information, not legal or tax advice. Entity rules, fees, and effective-date options vary by state, and the right answer depends on your facts — check with your Secretary of State and a CPA or attorney before filing.

The short version

Step What it is Typical cost Typical time
1 Confirm the LLC is actually worth it $0 30 min
2 Check name availability + clear the trademark $0 1 hour
3 Appoint a registered agent $0 (yourself) – $125/yr 10 min
4 File Articles of Organization (pick your effective date) $35–$500 state fee Same day – 4 weeks
5 Write an operating agreement $0 (template) 1 hour
6 Sort out the EIN (usually: keep yours) $0 15 min
7 Open the LLC bank account; close/repurpose the old one $0 1 hour
8 Move contracts, licenses, permits, insurance, W-9s Varies 1–3 weeks
9 Transfer the assets on paper $0 30 min

Realistic all-in for a one-person service business doing this itself: $50–$300 and about a week of elapsed effort, most of it waiting on the state. Our state-by-state LLC cost breakdown has the exact filing fee and annual report cost where you live.

First: is this actually the right move?

Changing structure is cheap but not free, and it creates permanent annual obligations — an annual report, possibly a franchise tax, possibly a registered agent bill. Four triggers genuinely justify it:

  • You've started signing contracts or taking on liability. A client contract, a commercial lease, a vendor agreement, employees, inventory in people's hands — these are the real reasons.
  • You have personal assets worth separating. Home equity, savings, a paid-off car. An LLC's liability shield protects what's outside the business.
  • A customer or platform requires it. Enterprise clients, some marketplaces, and some lenders won't contract with an individual.
  • You're approaching an S-corp election. Once profit is consistently above roughly $40,000–$50,000, the S-corp route can cut self-employment tax — and it generally needs an entity first. See LLC vs sole proprietorship vs S-corp.

Three reasons that are not good enough on their own: it sounds more professional, you want to deduct more (an LLC changes nothing about which expenses are deductible), or you read that it's "what real businesses do." If none of the four triggers apply yet, LLC before or after your first sale and when a freelancer should form an LLC will talk you through waiting without guilt.

What actually changes — and what doesn't

This table resolves most of the anxiety, because the right-hand column is longer than people expect.

Changes Stays exactly the same
Legal A separate legal person now owns the business; personal liability shield (if you respect it) Your personal liability for anything that happened before the effective date
Taxes Nothing, by default Schedule C, the 15.3% SE tax, quarterly estimates, your deductions, your depreciation schedules, asset basis
Banking New account in the LLC's name Your bookkeeping method, your accounting software
Paperwork Annual report, state franchise tax in some states, registered agent Your business licenses' renewal cycles (though the holder's name changes)
Identity Contracts, invoices, and your W-9 now say "Your Business LLC" Your EIN, in most single-member cases

The tax column is the one to internalize. A single-member LLC is a disregarded entity by default: the IRS ignores it and you keep filing the same Schedule C on the same Form 1040. There is no LLC tax return, no new filing, no second Schedule C for the stub period, and no mid-year cutoff on your books for federal income tax purposes. If you've been setting aside 25–30% for taxes, keep doing exactly that.

The EIN question, settled

The IRS's own "When to get a new EIN" guidance lists, under Limited liability company, the cases where no new EIN is needed — including:

"Use your sole proprietor EIN for your single-member LLC and don't choose to be taxed as a corporation or an S corporation and don't have employees or owe excise tax."

So the decision is mechanical:

Your situation New EIN?
Single-member LLC, disregarded, no employees, no excise tax No — keep your sole prop EIN
Single-member LLC with employees Yes — the LLC is the employer for employment-tax purposes
Single-member LLC that owes excise tax Yes
Electing S-corp or C-corp taxation Yes
Taking on a partner (multi-member LLC) Yes — the sole-prop page is explicit: form a partnership, get a new EIN
No EIN at all today (you've used your SSN) Not required if disregarded with no employees — but get one anyway, free, so your SSN stays off client W-9s

Two practical notes. Getting an extra EIN isn't a crime — it's just avoidable churn: new W-9s to every client mid-year, two 1099s arriving under different TINs next January, and a bank that wants fresh paperwork. And if you do need a new one, it's free and instant from the IRS directly; never pay for one. Background: what an EIN is and whether you need one and EINs for sole proprietors.

The nine steps

Step 1: Pick the state (it's almost always yours)

Form in the state where you actually live and work. Registering in Delaware, Nevada, or Wyoming while operating from Ohio means you'd also have to register as a foreign LLC in Ohio — two filings, two annual reports, two registered agents, no tax benefit for a one-person service business. The full argument is in the best state to form an LLC.

Step 2: Clear the name — all three ways

Three separate checks, and people skip two of them:

  1. State entity search — is the exact name available in your Secretary of State's database? LLC names must be distinguishable from existing registrations in that state, and must include a designator ("LLC," "L.L.C.," or "Limited Liability Company").
  2. Federal trademark search — a free USPTO search tells you whether someone has rights in your industry. A state approving your name says nothing about trademark risk. See how to trademark a business name.
  3. Domain and handles — cheap to check, expensive to discover later.

If you've been trading under a DBA, you have a choice: make the DBA your legal LLC name ("Lakeside Cleaning LLC"), or keep the LLC name formal and re-register the DBA under the LLC so you can keep the brand. The second is common, and the key word is re-register — a DBA belongs to the person or entity that filed it, and your old one belongs to you personally. Details: do I need a DBA.

Step 3: Appoint a registered agent

Every state requires an in-state address to receive legal service. You can be your own agent if you have a physical address in the state and are around during business hours — but it becomes part of the public record, which matters if you work from home or a rental. A commercial agent runs roughly $100–$125/year and keeps your address private. If that's your worry, virtual business addresses for an LLC covers the trade-offs, including what a virtual address can't legally do.

Step 4: File the Articles of Organization — and choose the effective date

This is the filing that creates the LLC. You'll need the name, the registered agent, the business address, the members, and sometimes a purpose statement. Fees run roughly $35 to $500 depending on the state; processing ranges from instant (many online filings) to several weeks (a few states by mail).

The field worth caring about in November: the effective date. Most states let you specify a future effective date on a formation filing, commonly up to 90 days out — which means a filing submitted today can bring your LLC into existence on January 1, 2027. Some states are tighter (Virginia, for example, allows only a short future window), and a few don't offer it on formation filings at all, so confirm on your state's form before you count on it. No state lets you backdate.

Why a January 1 date is usually the better choice when you're this close to year-end:

  • One clean set of books per year. Your sole prop ends December 31; the LLC's first fiscal year is a full calendar year. No mid-year handoff to reconstruct.
  • No stub-period bank mess. You open the LLC account in late December and start running everything through it on January 2.
  • Contracts and W-9s flip on one date. You can tell clients "as of January 1, invoices come from the LLC" instead of chasing an awkward mid-December boundary.
  • In some states, it avoids a duplicate annual tax. California is the sharpest example: its $800 annual LLC tax applies in the first taxable year, and under the state's 15-day rule, an LLC that comes into existence in the last 15 days of December and conducts no business in those days doesn't have a first-year filing or tax for that short year. Miss that and you can face back-to-back $800 payments four months apart. (The AB 85 first-year exemption only covered LLCs registered from 2021 through 2023 — it's not available for a 2026 or 2027 formation.) Your state's version will differ; ask before you file.

One caution on the January 1 date: in some states the annual report clock starts from the effective date, and in a handful the first annual report can come due surprisingly soon. Worth a one-line question to the filing office.

Step 5: Write an operating agreement

Only a few states require one, and every single-member LLC should have one anyway. It's the document that says the LLC exists as something other than your alter ego — which is exactly what someone will argue in court when they try to pierce the shield. It should cover ownership, management, capital contributions (including the assets you're moving in at Step 9), distributions, and dissolution. A template is fine for one member. Here's what goes in an LLC operating agreement.

Step 6: Handle the EIN

Per the table above, most single-member LLCs keep the existing sole prop EIN. If you need a new one, apply directly with the IRS — it's free and usually immediate.

Step 7: Open the LLC's bank account

This is the step that makes the liability shield real, and it's not optional. Commingling personal and LLC money is the most common reason courts disregard an LLC. Bring your filed Articles, your EIN confirmation, your operating agreement, and ID. Then:

  • Move the balance across as a documented owner contribution — not a mystery transfer.
  • Switch every recurring charge: software, hosting, ads, insurance, merchant processor, phone.
  • Update payout destinations on Stripe, PayPal, Etsy, Shopify, Upwork, and any platform that pays you, including the legal-entity name on the account.
  • Keep the old account open for 60–90 days so stray checks and refunds don't bounce, then close it.

Walkthroughs: opening a business bank account and separating finances and the documents checklist.

Step 8: Move the outside world over

The part nobody budgets time for. Work it in this order, because some items depend on others:

  1. Business licenses and permits. Most are held by a person or entity, not a business name — so they usually need to be amended or reissued in the LLC's name, not just renamed. Call the issuing office; don't assume.
  2. Sales tax / seller's permit. In many states the LLC is a new registrant and needs its own permit, with the old one closed out. Getting this wrong means collecting tax under a dead registration number. See sales tax for online sellers.
  3. Insurance. Have your policies reissued with the LLC as the named insured. A general liability policy naming you personally may not respond to a claim against the LLC — and this is the point of the whole exercise. Start with business insurance for sole proprietors.
  4. Client contracts. Ongoing agreements should be assigned to the LLC or re-signed in its name. For most freelance relationships a short written assignment, or simply a new agreement on the next renewal, is enough.
  5. New W-9s to every client who pays you. Send them on the effective date, with the LLC's legal name and the correct TIN. Do it late and you'll get 1099s under the wrong name.
  6. Leases, loans, and equipment finance. Check for assignment clauses. A personal guarantee usually survives a structure change — the LLC does not erase a loan you already personally guaranteed.
  7. Invoices, contracts, website footer, email signature, proposals. The legal name needs to appear, with "LLC," everywhere you hold yourself out. A client who never saw the LLC named can argue they contracted with you personally.
  8. Payment processors and marketplaces. Update the legal entity, tax ID, and bank account together — doing them separately triggers verification holds.

Step 9: Transfer the assets on paper

For a single-member LLC, this is bookkeeping, not a tax event. You contribute your business assets — laptop, camera, tools, inventory, vehicle if it's a business vehicle, domain names, client lists — to the LLC in exchange for your membership interest. Basis carries over; depreciation schedules continue on their existing timelines rather than restarting. Write a one-page bill of sale or contribution agreement listing each asset and its value, sign it, date it the effective date, and keep it with the operating agreement.

Two things to think about: titled property (vehicles, real estate) requires a real title transfer, which can trigger transfer taxes, re-titling fees, a new insurance policy, and occasionally a lender's due-on-transfer clause — price it before you move a financed vehicle. And liabilities don't automatically follow the assets; a debt you personally owe stays yours unless the creditor agrees otherwise.

Filing in November: the decision table

Your situation Best effective date
Want the liability shield in place for a contract signing this month Immediate — the shield is worth more than clean books
Mostly cleaning up structure before next year January 1, 2027
In California and formation is imminent Confirm the 15-day rule before choosing — a December 17-or-later existence date with no activity can save you $800
Planning an S-corp election for 2027 Form now with a Jan 1 date, then file Form 2553 within the window — generally no later than 2 months and 15 days after the start of the tax year the election takes effect
Not sure the business will still exist next year Wait. Forming and dissolving costs more than not forming

If you form now and change your mind later, closing an LLC is its own process with its own fees and final filings — see how to close or dissolve an LLC before you create an entity you're unsure about.

Five mistakes that undo the whole thing

  1. Running revenue through your personal account after the effective date. The fastest way to hand a plaintiff the alter-ego argument. Fix on day one.
  2. Signing as yourself. Sign "Jane Doe, Member, Lakeside Cleaning LLC." Signing as a bare individual can bind you personally.
  3. Leaving insurance in your own name. An LLC without matching coverage is a shield with a hole in it.
  4. Assuming you must get a new EIN. Usually you shouldn't — see the IRS language above. Unnecessary EIN churn creates duplicate 1099s and bank delays.
  5. Believing the LLC covers the past. The shield applies to what the LLC does after its effective date. Work you did last spring was done by you personally, forever. If that exposure worries you, talk to an attorney about tail coverage rather than hoping the filing retroactively helps.

Also worth knowing because the vendor SERP is still stale on it: under the FinCEN interim final rule in effect since March 2025, domestic U.S. LLCs are exempt from beneficial ownership information (BOI) reporting — only foreign entities registered to do business in the U.S. still file. Plenty of formation services still sell BOI filing as a required add-on. Decline it, and verify current status with FinCEN before you pay anyone for it. More on which upsells to skip: best LLC formation services.

Cleaning up your business structure before the new year? Subscribe to the newsletter — practical, numbers-first guides for first-time founders, every week.

Frequently Asked Questions

Can I convert my sole proprietorship to an LLC, or do I have to start over?

Neither, exactly. There's no conversion filing available, because a sole proprietorship isn't a registered entity — so you form a new LLC and move the business into it. But you don't "start over" in any way that matters: your customers, brand, bank relationships, website, licenses, and in most cases your EIN all carry forward. The business continues; the legal owner of it changes.

Do I need a new EIN when I change from a sole proprietorship to an LLC?

Usually not. The IRS says you don't need a new EIN if you use your sole proprietor EIN for a single-member LLC that isn't electing corporate or S-corp taxation, has no employees, and owes no excise tax. You do need a new one if you have employees, owe excise tax, elect corporate or S-corp treatment, or take on a partner. Many pages state flatly that a new EIN is required — that's wrong for the most common single-owner case.

Will my taxes change after forming an LLC?

By default, no. A single-member LLC is a disregarded entity: same Schedule C, same 15.3% self-employment tax, same quarterly estimated payments, same deductible expenses, same depreciation schedules. Your tax picture only changes if you affirmatively elect S-corp or C-corp treatment, which is a separate filing and a separate decision — one that generally pays off only once profit is consistently in the $40,000–$50,000-plus range.

Should I form my LLC now or wait until January 1?

If you need the liability shield right now — a contract to sign, a client starting, employees arriving — form immediately. Otherwise, a January 1 effective date is usually cleaner: one set of books per calendar year, no mid-year bank handoff, and in some states no duplicate first-year tax. Most states allow a future effective date up to about 90 days out on a formation filing, so November and December are exactly when you'd set this up. Confirm your state offers it; no state allows backdating.

Do I file two Schedule Cs if I form the LLC mid-year?

No. For a single-member LLC treated as a disregarded entity, you file one Schedule C covering the full year, because the IRS treats the income as yours throughout. What does split at the effective date is the legal and bookkeeping reality — bank accounts, contracts, invoices, liability — which is the practical argument for a January 1 date rather than a tax-filing one.

Can I keep my DBA after forming an LLC?

Usually yes, but it has to be re-registered under the LLC. A DBA (also called a fictitious or trade name) is held by whoever filed it, and yours is currently held by you as an individual. Most people either adopt the trade name as the LLC's legal name or file a new DBA in the LLC's name and keep trading under the brand. Procedures and fees are county- or state-specific.

What happens to contracts I signed as a sole proprietor?

They remain yours personally unless they're assigned to the LLC or replaced. Many contracts have an assignment clause that either permits assignment or requires the other party's consent. For ongoing freelance or service relationships, the simplest path is a short written assignment now, or re-signing in the LLC's name at the next renewal. And note that nothing — assignment included — removes your personal responsibility for work already performed.

Does an LLC protect me from things that happened before I formed it?

No. The liability shield only applies to the LLC's acts from its effective date forward. A claim arising from work you did as a sole proprietor is a claim against you personally, no matter what you form afterward. That's a strong argument for forming earlier rather than later, and for carrying insurance that covers prior work if your field has long claim tails.

How much does it cost to switch from a sole proprietorship to an LLC?

The state filing fee is the main cost, roughly $35 to $500 depending on where you form, plus optional items: a registered agent at about $100–$125/year, a DBA re-registration, and in some states a franchise tax or annual report fee that starts in the first year. Doing it yourself through your Secretary of State's website is entirely feasible — formation services mostly resell the same filing with upsells attached. Our LLC cost breakdown lists it state by state.

Do I need to tell my clients I formed an LLC?

Yes, and the notification is short. Send a new W-9 with the LLC's legal name and TIN, tell them which date invoices change over, and give them updated remittance details if the bank account changed. Doing this on the effective date rather than in January is what prevents mismatched 1099s and payments routed to a closed account.