Converting a Sole Proprietorship to an LLC

To convert a sole proprietorship to an LLC, you form a brand-new legal entity with your state, then move your business's name, money, contracts, and licenses into it — your old sole proprietorship doesn't "become" an LLC, it's replaced by one. There is no state form called "convert my sole prop." You are creating a new business and carefully retiring the old one.

Here's the practical order most people follow, plus the parts people commonly skip that end up costing them the liability protection they formed the LLC to get.

What to do: step by step

1. Choose a name and check availability

Your state's business-name database (usually run by the Secretary of State) will show whether your desired name — or one confusingly close — is already taken by another registered entity. If you've been operating under a "doing business as" (DBA) name as a sole proprietor, you can often carry it forward, but you'll typically need to re-register it under the new LLC. Most states also require the name to include an LLC designator such as "LLC" or "Limited Liability Company."

2. File articles of organization with the state

This is the document that actually creates the LLC — sometimes called a certificate of formation, depending on the state. It's filed with your state's business filing office, generally names a registered agent (someone with a physical in-state address who can accept legal papers for the LLC), and requires a filing fee. That fee, and any ongoing report or franchise-tax obligations tied to it, varies by state — check your Secretary of State's website for the current amount and any recurring deadlines, since missing one can put the LLC out of good standing.

3. Get a new EIN (in most cases)

An Employer Identification Number is the business equivalent of a Social Security number, issued free by the IRS. Because an LLC is legally distinct from you as an individual, the IRS generally expects a new EIN once you form one — this is required if the LLC has more than one member, elects corporate taxation, or will have employees or certain excise-tax obligations. A single-member LLC with no employees that keeps the default tax treatment can sometimes keep using the owner's Social Security number, but most people get a new EIN anyway: it keeps the LLC's tax history cleanly separated from your personal one, which matters for audits or financing. Apply directly and for free at irs.gov — never pay a third party for this.

4. Open a business bank account in the LLC's name

Once you have your filed articles and your new EIN, open a checking account (and card, if you use one) titled to the LLC, not to you personally. Move operating cash into it and run all business income and expenses through that account going forward. This is not optional paperwork — it's central to whether the liability shield actually holds up, explained further below.

5. Move contracts, licenses, and permits

Client contracts, vendor agreements, leases, professional or occupational licenses, sales-tax permits, and local business licenses were generally issued to you personally as a sole proprietor. Some can be reassigned or amended to the LLC's name; some need the other party's consent; professional licenses (contractor, cosmetology, real estate, health fields) are typically tied to the individual and may need a separate business registration rather than a transfer. Check with each licensing board and counterparty — don't assume a lease or client agreement follows you automatically.

6. Update your insurance

Tell your general liability, professional liability, commercial auto, or other business insurer that the business is now an LLC. Policies are written to a named insured, and if that name no longer matches your actual structure, a claim could be delayed or disputed at the worst possible time.

7. Adopt an operating agreement

An operating agreement is the internal document spelling out ownership percentages, how profits and losses are shared, how decisions get made, and what happens if a member leaves or the business is sold. Even a single-member LLC benefits from having one — it's evidence that the LLC is being run as a real, separate business rather than as an extension of your personal finances. Many states don't legally require one, but "not required" and "not worth having" are different things.

The tax treatment doesn't change automatically

This trips people up: forming an LLC changes your liability exposure, not your tax treatment, unless you separately elect otherwise. An LLC has no tax classification of its own. By default, a single-member LLC is a "disregarded entity" and is still taxed like a sole proprietorship — income and expenses still flow onto your personal return on Schedule C, and you still pay self-employment tax (15.3%, covering the 12.4% Social Security portion up to the annually adjusting wage base, plus the 2.9% Medicare portion) on your net earnings. A multi-member LLC defaults to partnership taxation instead (Form 1065). Either kind of LLC can elect to be taxed as an S corporation or C corporation, but that's a separate, optional IRS filing — forming the LLC alone does not trigger it. Whether an entity-tax election makes sense for you depends on your income and situation, and is worth discussing with a CPA.

You have to actually operate as an LLC to keep the shield

The liability protection an LLC offers — generally keeping your house, car, and personal savings separate from business debts and lawsuits — is not automatic just because you filed a piece of paper, and it is never absolute. Courts can disregard the LLC ("pierce the corporate veil") and hold the owner personally liable if it isn't actually treated as a separate business. The most common way people lose that protection: continuing to pay personal bills from the business account (or vice versa), signing new contracts in their own name instead of the LLC's, or letting the LLC lapse out of good standing by missing state filing deadlines. It's also worth knowing what an LLC never protects against, even when everything is done right: your own negligence or fraud, debts you personally guaranteed, and unpaid payroll trust-fund taxes if you ever have employees — those withheld payroll taxes are trust-fund money, and a responsible person can be held personally liable for them regardless of the entity.

Deadlines and fees vary by state

Formation fees, annual or biennial report requirements, franchise or entity-level taxes, and the deadlines attached to all of them are set by each state and change from time to time — there is no nationwide number to quote here. Confirm the current filing fee, the report due date, and any state tax obligations directly with your Secretary of State (or equivalent) and state tax agency, both before and after you file. If your business collects sales tax, check with your state's tax agency about re-registering the permit under the LLC's name and EIN.

If you're also thinking about how workers you hire should be classified, that's a separate step from formation — worker classification is a legal test based on the real working relationship, not on what entity you operate under or what a contract says. And converting to an LLC going forward does not erase personal liability you already took on as a sole proprietor, such as a personal guarantee on an existing loan or lease.

Key takeaways

• Converting isn't a single form — you're forming a new LLC and then migrating your name, bank account, contracts, licenses, and insurance into it.
• Filing articles of organization with your state is what legally creates the LLC; fees and ongoing report deadlines vary by state, so confirm them with your Secretary of State.
• Most conversions require a new EIN from the IRS — free to obtain directly at irs.gov.
• Your tax treatment stays the same by default (Schedule C for a single-member LLC) unless you separately file an entity-tax election — forming an LLC changes liability, not automatically taxes.
• The liability shield only holds up if you keep business and personal finances separate and keep the LLC in good standing — it never covers personal guarantees, your own wrongdoing, or unpaid payroll trust-fund taxes.

Frequently asked questions

Do I need a new EIN when I convert to an LLC?

In most cases, yes. A multi-member LLC, an LLC electing corporate tax treatment, or an LLC with employees generally needs a new EIN. A single-member LLC with no employees that keeps the default tax status can sometimes keep using the owner's Social Security number, but a separate EIN is commonly recommended anyway to keep records clean. Apply for free at irs.gov.

Does forming an LLC change how much tax I pay?

Not by itself. An LLC has no tax classification of its own, so the default treatment mirrors what you had as a sole proprietor (or a partnership, if there are multiple owners) — income still passes through to your personal return, and you still owe self-employment tax on net earnings. Any change comes only from a separate election, worth discussing with a CPA.

Can I just keep using my sole proprietorship's bank account?

You can, but it undermines the reason you formed the LLC. Mixing personal and business funds, or running the business through an account still titled to you personally, is one of the clearest things a court looks at when deciding whether to hold the owner personally liable.

What happens to contracts I signed as a sole proprietor?

They generally stay attached to you personally unless formally assigned or amended, and some counterparties or licensing boards may require their own consent or a fresh application before the LLC can take over. Review each contract, license, and permit individually rather than assuming they transfer automatically.

Do I have to file anything with my state every year after I form the LLC?

Many states require a periodic report and sometimes a fee or franchise tax to stay in good standing, but the schedule, cost, and consequences of missing it vary by state. Check directly with your Secretary of State or equivalent filing office for the current requirement.

This article provides general business information, not legal, tax, or financial advice. For anything significant, consult a qualified attorney or CPA, and use the free official tools at the IRS (irs.gov) and SBA (sba.gov, including SCORE and your state's Small Business Development Center).