How to Convert Sole Proprietorship to LLC

Here is the fact that makes this whole process less mysterious: in almost every state there is no “conversion” filing from sole proprietorship to LLC, because a sole proprietorship is not a registered entity in the first place. You do not convert anything. You form a new LLC, move the business into it, and retire the old identity, and the entire project usually costs less than $500 and takes a few weeks of part-time attention. This guide walks the migration in order: the formation filing, the EIN decision (with the actual IRS rule, which surprises most people), the bank account, the licenses and contracts that must move, the tax reality, and the mistakes that quietly undo the liability protection you did all this for.

The Honest Headline: There Is No Conversion Filing

States offer statutory “conversion” procedures for turning one registered entity into another, a corporation into an LLC, for example. A sole proprietorship does not qualify, because legally it is you personally, doing business, perhaps under a registered trade name. There is no entity on file to convert.

That simplifies your job into two workstreams. First, create the LLC: file Articles of Organization with your state, exactly as any new LLC would (our LLC formation walkthrough covers the filing screen by screen). Second, migrate the business: move the money, licenses, name, contracts, and insurance from you-personally to the new company, and start signing everything in the LLC’s name. The first workstream takes one afternoon. The second is where the protection is actually won or lost, and it is what most of this guide covers.

Still deciding whether the move is worth it? That is a different question, and we keep it in its own article: the sole proprietorship vs. LLC comparison covers when the liability shield earns its keep. This page assumes you have decided and shows you the execution.

Step by Step: The Migration in Order

1. Clear the name. Search your state’s business registry for your intended LLC name. If you have been operating under a DBA (“doing business as” name), you can usually keep trading under it by re-registering the DBA to the LLC after formation.
2. File Articles of Organization. The state filing that creates the LLC, listing its name, address, and registered agent. Most states process online filings in days.
3. Adopt an operating agreement. Even solo. It documents that the LLC is a real, separately governed company, which banks ask for and courts respect. A single-member version takes an evening with our operating agreement template.
4. Sort the EIN. The actual IRS rule is below, because it is more nuanced than most guides admit.
5. Open the LLC bank account. Bring the stamped Articles, the operating agreement, and the EIN confirmation. From this day, all business income and expenses run through this account, no exceptions.
6. Move licenses, permits, and tax registrations. Local business licenses, professional licenses, and your seller’s permit generally must be reissued or updated to the LLC, because they were issued to you personally. Notify your state tax accounts too.
7. Re-register or transfer the DBA. If customers know you by the trade name, register the same DBA under the LLC so invoices, signage, and the bank all match.
8. Update contracts, clients, and vendors. New work gets signed by the LLC. Ongoing arrangements get a short notice or a re-signed agreement, covered below.
9. Move the insurance. Liability policies must name the LLC as the insured. A policy still written to you personally can leave the company bare exactly when it matters.

None of these steps is hard; the risk is stopping after step 2 and running the “LLC” out of a personal checking account, which is how owners hand courts a reason to ignore the entity entirely.

The EIN Rule, Straight From the IRS

Most articles say “get a new EIN” and move on. The IRS’s own rule is more specific, and worth getting right:

• Single-member LLC, no employees, default taxes: you may keep using your existing sole-proprietor EIN. In the IRS’s words, no new EIN is needed if you “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.”
• You need a new EIN if the LLC will have employees or owe excise taxes, if it has more than one member (it becomes a partnership for tax purposes), or if you elect corporate or S-corp taxation.
• Never had an EIN at all? Plenty of sole proprietors ran on their SSN alone. The LLC’s EIN application takes minutes on the IRS site and is free; the full walkthrough is in our EIN guide.

The practical wrinkle: even where the IRS lets you reuse the old EIN, banks and payment processors frequently want an EIN issued in the LLC’s own name for the new account. Getting a fresh EIN for the LLC is free, takes ten minutes, and gives the company a clean identity, which is why many owners do it even when the rule does not force them to. If you expect to hire or elect S-corp status soon, skip the debate and get the new EIN now.

What the Move Costs (Verified Anchors)

The core cost is your state’s formation fee plus whatever recurring compliance it charges. A few verified anchors to calibrate expectations: California’s Articles of Organization fee is modest but the state adds a $20 Statement of Information (due within 90 days, then every two years) and an $800 annual Franchise Tax Board tax; Texas charges $300 to form with no annual report fee below the franchise-tax threshold; New York charges $200 to form plus its publication requirement, six weeks of newspaper notices and a $50 Certificate of Publication that can add anywhere from about $100 upstate to $1,000 or more in downstate counties. Every state’s current formation fee, with the recurring costs alongside, is in our LLC formation cost calculator.

Beyond the state: a registered agent if you hire one (about $99 to $199 a year), possible license reissue fees, and new checks or payment-processor updates. Budget a few hundred dollars all-in for most states, and remember the recurring line items, the annual report and any state LLC tax, start next year whether or not anyone reminds you.

Taxes: What Changes and What Doesn’t

Here is the part that disappoints people looking for a loophole and reassures everyone else: by default, nothing about your income taxes changes. A single-member LLC is a “disregarded entity” to the IRS, meaning the LLC is ignored for income-tax purposes; you keep filing the same Schedule C with your Form 1040 and paying the same self-employment tax. There is no final return for the sole proprietorship and no new federal filing, because federally it is the same taxpayer continuing the same business. The LLC buys liability protection, not a tax cut.

The changes are conditional. Add a second member and the LLC files a partnership return (Form 1065). Hire employees and payroll filings begin. And once profits are healthy, you can elect S-corp taxation to trim self-employment tax on the portion above a reasonable salary, an election with its own paperwork, deadlines, and payroll obligations, covered in our Form 2553 guide, with the break-even math in the S-corp vs. LLC calculator. The sensible order is: migrate first, run clean books, then decide on the S-corp with real numbers.

Contracts, Clients, and the Paper Trail

Liability protection only covers what the LLC is actually a party to. A contract you signed personally stays your personal obligation until it is replaced or formally assigned. Work through the paper in three passes:

• New work: from formation day, every proposal, invoice, and agreement is issued in the LLC’s legal name, and you sign as “[Your Name], Member, [LLC Name].” That signature format matters; signing bare, without the title and company, can put you personally back on the hook.
• Ongoing clients: send a short notice that the business now operates as the LLC and future invoices will come from it, and re-sign long-running agreements in the LLC’s name where you can. Most clients treat this as routine.
• Leases, loans, and anything a counterparty must approve: these need the other side’s consent to move to the LLC, and landlords and lenders will often still want your personal guarantee. Ask, but expect the guarantee to survive.

Keep a one-page log of what moved and when. If a dispute ever tests the LLC, that log plus the operating agreement and the separate bank account are the exhibits that show a real company, not a label.

Timing the Switch

January 1 is the tidiest switch date, one clean line in your books, but do not wait months for tidiness. Since a disregarded single-member LLC changes nothing about your federal income taxes anyway, a mid-year move costs you nothing at tax time; your Schedule C continues uninterrupted. The moments that should accelerate the decision: signing a bigger client or lease, hiring your first contractor or employee, launching a product with real liability exposure, or a landlord or lender asking for an entity. Form the LLC before the risk arrives, because the shield does not apply retroactively to things that happened while you were a sole proprietor.

One caution for regulated professions: if your license board must approve or reissue the license in the LLC’s name (and some require a special professional entity type instead), start that approval before you announce the change to clients, so there is no gap when you are billing under an entity your license does not yet cover.

Common Migration Mistakes

• Forming the LLC and changing nothing else. Same personal bank account, same personally signed contracts: a court can treat the LLC as a shell and reach your personal assets anyway.
• Mixing funds “temporarily.” Paying home bills from the business account is the classic evidence used to pierce the liability shield. Pay yourself by transferring to your personal account, then spend.
• Forgetting the licenses. Local licenses, professional licenses, and seller’s permits were issued to you personally and rarely transfer automatically.
• Assuming the EIN transfers to any structure. Add a member or elect S-corp status and a new EIN is required; the reuse allowance covers only the single-member, no-employee default case.
• Missing the state’s first compliance deadline. Some arrive fast; California wants the first Statement of Information within 90 days of formation.
• Leaving insurance in your personal name. The policy should insure the LLC the same week the bank account opens.

When a Lawyer or Service Earns Its Fee

A solo owner with straightforward work can run this whole migration DIY with the state portal and the templates linked above. A formation service earns its fee when you want the filing, EIN, agent, and compliance calendar handled in one place while you keep the business running. A lawyer earns theirs when the facts get heavier: a co-owner joining at the same time (that is a partnership agreement conversation, not merely a filing), a licensed profession with entity restrictions, meaningful contracts or debt that must be assigned, or a landlord and lender negotiation over guarantees. The pattern that wastes money is paying professional rates for the parts the portal does in an afternoon, and the pattern that costs more later is skipping advice exactly when ownership or licensing is complicated.

Frequently Asked Questions

Is there an official form to convert a sole proprietorship to an LLC?

No. Statutory conversions exist for registered entities, and a sole proprietorship is not one. You form a new LLC with regular Articles of Organization and migrate the business into it: bank account, licenses, DBA, contracts, and insurance.

Do I need a new EIN when I form the LLC?

Per the IRS: not if the LLC is single-member with no employees and default taxation, in which case your sole-proprietor EIN can carry over. A new EIN is required if the LLC has employees, owes excise tax, has multiple members, or elects corporate or S-corp taxation. Banks often prefer the LLC to have its own EIN either way.

Will my taxes go down after switching to an LLC?

By default, no. A single-member LLC files the same Schedule C and pays the same self-employment tax; the LLC exists for liability protection. Tax savings, if any, come later from an S-corp election once profits comfortably exceed a reasonable salary.

How much does the switch cost?

The state formation fee plus extras. Verified anchors: Texas $300; New York $200 plus its publication requirement ($50 certificate and roughly $100 to $1,000+ in newspaper costs by county); California’s low filing fee comes with a $20 Statement of Information and an $800 annual state tax. Most owners land under $500 up front.

Can I keep my business name?

Usually. If the name is available as an LLC name, register it as the company’s legal name; if you trade under a DBA, re-register that DBA to the new LLC so the bank, invoices, and signage all match. Check your state registry before filing.

Do my existing contracts move to the LLC automatically?

No. Contracts you signed personally remain yours until re-signed or assigned to the LLC, and counterparties like landlords and lenders must consent, often keeping your personal guarantee. Sign all new work in the LLC’s name from day one.

When is the best time to make the switch?

Before the next jump in risk: a big client, a lease, a hire, or a launch. January 1 is bookkeeping-tidy, but a mid-year switch has no federal tax cost for a single-member LLC, so do not delay months for a clean calendar.

The Bottom Line

Moving from sole proprietorship to LLC is a formation plus a migration, not a conversion. File the Articles, adopt an operating agreement, make the EIN decision on the real IRS rule instead of folklore, open the company bank account, and then finish the unglamorous half: licenses, DBA, contracts, and insurance, all moved into the LLC’s name. The filing makes the company exist; the migration makes the protection real. Do both, keep the money separate, and the biggest legal upgrade available to a one-person business is done in a few weeks for a few hundred dollars.

David Miller

David Miller writes about small business and LLC formation for ClearLegalTips. He focuses on making business registration, S-corp elections, and seller’s permits understandable for new founders handling them without a lawyer.