What You Already Are If You Have Not Registered Anything
There is no form that makes you a sole proprietor. The IRS describes one as someone who owns an unincorporated business by themselves. That status attaches the moment you take money for work. No state filing, no fee, no waiting period. If you invoiced a client last month and never registered anything, you were a sole proprietor when the payment cleared.
The consequence of that simplicity is that there is no second party. The business and the person are the same legal entity. Every contract you sign is signed by you. Every invoice you fail to pay is your unpaid invoice. If a customer sues over work performed, the defendant is your name. A judgment reaches whatever you own, including the money in your personal savings account and, in many states, the equity in your home.
On the tax side you report profit or loss on Schedule C attached to your Form 1040. You compute self employment tax on Schedule SE. The IRS requires Schedule SE once net earnings from self employment reach $400, the floor IRC 1402(b)(2) sets. Your business name is your legal name unless you file an assumed name certificate. That is a separate exercise covered in DBA vs sole proprietorship.
What Forming an LLC Actually Changes
An LLC exists because a state says it does. You file articles of organization with the filing agency, pay the fee, name a registered agent. The state then issues a record. From that point the company is a legal person that can hold a bank account, sign a lease, borrow money, own equipment and be sued in its own name. The mechanics of that filing are set out in how to start an LLC. The entity itself is described in what is an LLC.
Three things change on the day the state accepts the filing. First, the debts of the company are the debts of the company. A member is not personally liable for them by statute. Second, the company continues to exist independently of you. That is what lets you add a partner, sell a share or pass it to an heir without dissolving the business.
Third, you now have a compliance obligation: a registered agent at a physical address in the state, an annual or biennial filing in most states, and a record that must be kept current.
One thing does not change: the name on the door does not protect itself. An LLC name is reserved against confusingly similar entity names inside that one state. It is not a trademark, and a company in another state may use it freely.
LLC vs Sole Proprietorship Side by Side
| Point of comparison | Sole proprietorship | LLC |
|---|---|---|
| How it comes into existence | Automatically, when you start trading | A filing accepted by the state agency |
| Governing document | None | An operating agreement among the members |
| Liability for business debts | Unlimited and personal | Limited to what the company owns, with exceptions |
| Default federal tax treatment | Schedule C on your Form 1040 | Disregarded with one member, partnership with two or more |
| Self employment tax on profit | Yes, on net earnings | Yes, identical, unless an election is filed |
| Adding an owner | Ends the sole proprietorship | Amend the operating agreement and the state record |
| State formation fee | None | $50 in Arizona, $99 in Ohio, $300 in Texas |
| Ongoing state filing | None | Annual or biennial report in most states |
| Name on the public record | Your legal name unless you file a trade name | The company name as filed |
| Business bank account | Often opened under your own name and SSN | Opened in the company name against the state record |
Form your LLC
We prepare it, file it with the agency, and confirm it came back accepted. Or keep reading and file it yourself; this guide covers both.
The Tax Bill Does Not Change On Its Own
This is the point most first time owners get wrong. Forming an LLC does not create a new tax status. The IRS states plainly that an LLC with only one member is treated as an entity disregarded as separate from its owner unless it files Form 8832, and that a domestic LLC with at least two members is classified as a partnership unless it does the same. A one member LLC files the same Schedule C it filed as a sole proprietorship, on the same Form 1040, with the same numbers.
Self employment tax carries across unchanged. The rate is 15.3 percent, made up of 12.4 percent for Social Security and 2.9 percent for Medicare. The Social Security portion applies only up to the wage base. The SSA sets that at $184,500 for earnings in 2026. Above that only the 2.9 percent Medicare portion continues. An Additional Medicare Tax of 0.9 percent applies above $200,000 for a single filer, $250,000 on a joint return and $125,000 for married filing separately. You may deduct the employer equivalent half of self employment tax in figuring adjusted gross income.
The qualified business income deduction is available either way. Both a sole proprietor and a default taxed LLC may deduct up to 20 percent of qualified business income. For tax years beginning in 2026 the IRS sets the threshold at $201,750 on a single return and $403,500 on a joint return, with the phase in ranges topping out at $276,750 and $553,500 respectively, in Revenue Procedure 2025-32. That same document records a new minimum deduction of $400 for taxpayers with at least $1,000 of qualified business income, effective for tax years beginning after December 31, 2025.
If you want the LLC to be taxed differently, that takes a second filing. Form 2553 makes the subchapter S election. Form 8832 changes the classification outright. Neither is a formation step. The arithmetic on whether the S election is worth the payroll it forces is worked through in LLC vs S corp: when the election pays for itself. The broader picture of how an LLC is taxed sits in the LLC taxes guide.
What the Liability Shield Does Not Cover
The shield is real and it is narrower than most people believe. Six situations reach through it, and a first year owner will meet at least two of them.
- Anything you personally guarantee. Landlords, equipment lessors and small business lenders routinely require a member guarantee. Once you sign it, the LLC is irrelevant to that debt.
- Your own negligence. Forming a company does not make you a stranger to your own conduct. If you cut a client's hair badly, drop a ladder on a car or give advice that causes a loss, you can be named personally alongside the company.
- Payroll trust fund taxes. Amounts withheld from employee wages are held in trust, and responsible persons can be assessed for them personally.
- Fraud and misrepresentation. A shield protects against the ordinary consequences of a business failing, not against a deliberate act.
- Debts you took on before the filing was accepted. Formation is not retroactive. An obligation signed in your own name in March is still yours after an August filing.
- A company that is not run as a company. One bank account for everything, personal spending straight out of business receipts and no written agreement are the standard facts a creditor points to when asking a court to disregard the entity.
The last item is the one you control completely. It costs nothing to avoid. A dedicated account, an operating agreement, minutes for anything unusual and a consistent method of paying yourself from the LLC are the record you will want if the question ever comes up.
What Each Structure Costs to Run
A sole proprietorship costs nothing to maintain. An LLC has a floor. Using the File.Business state fee table, formation runs $50 in Arizona and Colorado, $99 in Ohio, $125 in Florida, $150 in Illinois, $300 in Texas and $520 in Massachusetts. The recurring filing is the number that surprises people: $0 in Texas and Ohio, $25 in Colorado, $50 in Georgia, $139 in Florida, $200 in North Carolina and $820 in California.
Add a registered agent if you do not want your home address on the public record, a separate bank account, and a bookkeeping habit good enough to keep company and personal money apart. Against that, weigh the price of a general liability policy. A sole proprietor should carry one regardless.
The choice is not insurance or an entity. Most working businesses need both. State by state numbers and the ongoing tax picture are collected in franchise tax by state and the best state to form an LLC. That page also explains why forming outside the state where you actually work usually adds cost rather than removing it.
Five Mistakes When Moving From Sole Proprietor to LLC
Mistake 1: Keeping one bank account after formation
The single most common one, and the most damaging. If company receipts land in the account you also use for groceries, you have created the exact record a plaintiff needs. Open the company account in the week the state approves the filing. Move the deposits, and pay yourself by transfer rather than by spending directly from receipts.
Mistake 2: Expecting the LLC to cut the tax bill
A one member LLC pays exactly what the sole proprietorship paid, because Treas. Reg. 301.7701-3(b)(1) disregards a single owner entity for income tax unless it elects otherwise. Owners who formed to save tax and then see an identical Schedule C often assume something went wrong with the filing. Nothing went wrong. The saving, where one exists, comes from a later election, not from the entity.
Mistake 3: Signing contracts in your own name
After formation, contracts should name the company. They should be signed by you as a member or manager. A signature block that reads only your personal name invites an argument that you contracted personally. Update your proposal template, your engagement letter and your invoices on the day the entity is approved.
Mistake 4: Skipping the operating agreement as a single member
Owners with no partner see no one to agree with. The document is not only for disputes. It is the record that the company has its own governance. It tells a bank who may sign, and it sets out what happens to the business if you die or become unable to run it. Most states do not require it. Every serious counterparty asks for it.
Mistake 5: Forming in a state where you do not operate
A Wyoming LLC run from a kitchen table in Illinois is usually doing business in Illinois. That means foreign qualification there, two registered agents and two annual filings. The advice to form in a low fee state is written for companies with no fixed location. If you have a shop, a van or a client base in one state, form there.
Three Owners Who Ran the Numbers
Example one: a wedding photographer in Tucson
Marisol Duarte photographs about twenty two weddings a year. Revenue is $96,000. After gear, second shooters, travel and insurance her net profit is $61,000. She works alone and carries a general liability policy for venue requirements. Her self employment tax runs on 92.35 percent of profit, which is $56,334. At 15.3 percent that is $8,619.
Forming an Arizona LLC costs $50 with no recurring state report. It changes that $8,619 by exactly nothing. What it does change is that when a venue contract goes wrong, the party on the other side of the claim is the company and not Marisol personally. She formed the LLC for the contract exposure and kept her tax filing identical.
Example two: two partners in Fort Collins
Bright Hollow Bakery is run by two friends who split everything evenly. They had been operating for fourteen months with no filing at all. Under state law that made them a general partnership, and each of them was liable for the other one's commitments. They filed a Colorado LLC for $50 with a $25 annual report.
Federal treatment moved from a general partnership to an LLC taxed as a partnership. That is the same return: Form 1065 with a Schedule K-1 to each of them. The saving was not tax. It was that a supply contract signed by one partner no longer put the other partner's house behind it. The partnership form itself is covered in partnership registration.
Example three: a handyman in Columbus
Delroy Adams does residential repair work. Revenue is $140,000. Profit is $88,000. He carries a $1 million general liability policy. That handles the ladder and the broken window. What the policy does not handle is the $46,000 owed on a truck and a trailer, or a disputed remodel where a homeowner claims the work was defective and seeks the cost of tearing it out.
He formed an Ohio LLC for $99 with no annual report fee. His self employment tax on 92.35 percent of $88,000 is $12,432, before and after formation. He now signs jobs in the company name. The truck loan sits with the company, guaranteed personally, which he understood before signing.
What Happens When an Uninsured Claim Lands on a Sole Proprietor
The number that matters is not the filing fee. It is the gap between what a policy pays and what a claim is worth. A general liability policy with a $1 million limit and a $2 million aggregate covers bodily injury and property damage. It does not cover a contract dispute, a supplier balance, an equipment lease you walked away from, or a claim excluded by the policy language. Those are the exposures the entity addresses.
Put a figure on it. A remodel dispute resolved at $180,000 against a sole proprietor is collectible from personal bank accounts, personal vehicles and, in states without a generous homestead exemption, home equity. The same dispute against a properly run LLC with no personal guarantee reaches company assets only. A $46,000 equipment balance behaves the same way. And a lease you signed for a $2,400 a month unit with three years remaining is an $86,400 exposure. It follows you personally unless the company signed it.
There is a second, smaller penalty worth naming because it catches multi member LLCs specifically. An LLC taxed as a partnership files Form 1065 even in a year with no profit. The IRS sets the penalty for a late partnership return at $260 per partner per month. Revenue Procedure 2025-32 sets that rate for returns required to be filed in 2027. Two partners who file nine months late owe $4,680 for a return that reported no tax.
Where to Go Next in This Comparison
If you have decided the entity is worth it, the next question is usually the name. A trade name filing is a different animal from an entity. The difference is set out in LLC vs DBA. If you are weighing a corporation instead because outside investors are a real possibility, start with LLC vs C corporation.
If you are going into business with other people and someone has suggested a limited partnership, read LP vs LLP vs LLC first. The general partner in a limited partnership has the same unlimited exposure a sole proprietor has.
And if you are already profitable enough that an accountant has raised the S election, the tax election comparison lives in C corporation vs S corporation. The number crunching is in the single member LLC guide.
LLC vs sole proprietorship FAQ
Do I need to form an LLC to be a legal business?
No. A sole proprietorship is a legal business the moment you start trading. No state filing creates it. What you may still need is a local business license, a sales tax registration and a trade name filing if you operate under a name other than your own.
Will forming an LLC lower my taxes?
Not by itself. The IRS treats a one member LLC as a disregarded entity and a multi member LLC as a partnership by default. So the same profit flows to the same Schedule C or Schedule K-1 and the same self employment tax applies. A tax change requires a separate election on Form 2553 or Form 8832.
How much self employment tax does a sole proprietor pay in 2026?
The rate is 15.3 percent, made up of 12.4 percent for Social Security and 2.9 percent for Medicare, applied to 92.35 percent of net profit. The Social Security portion stops at the 2026 wage base of $184,500. An Additional Medicare Tax of 0.9 percent applies above $200,000 for a single filer.
Can an LLC be sued if I was the one who made the mistake?
Both can be named. The company is liable for its own obligations, and you remain personally liable for a tort you personally committed. That is why professionals in fields with malpractice exposure carry insurance besides holding an entity.
Do I need a new EIN when I convert a sole proprietorship to an LLC?
In most cases yes, because the entity is new. A single member LLC with no employees may use the owner's Social Security number for some purposes. But banks generally ask for an EIN in the company name, and an LLC taxed as a partnership or a corporation must have one.
What happens to my business name when I form the LLC?
The state records the company name and blocks confusingly similar entity names within that state. If you want to trade under a different name, you file an assumed name for the LLC. Neither step gives you trademark rights, which are granted federally.
Is a single member LLC worth it if I already carry liability insurance?
Insurance answers claims within its limits and exclusions. The entity answers contract debts, leases, supplier balances and claims the policy does not reach. Most working businesses hold both, and the filing fee is small next to a single uncovered obligation.
Form your LLC
We prepare it, file it with the agency, and confirm it came back accepted. Or keep reading and file it yourself; this guide covers both.
This guide is written from the official sources below. Fees, forms, and deadlines change. Confirm the current requirement with the agency before you file.
Disclosure. File.Business is a private filing service, not a government agency and not a law firm. We prepare and submit filings at your direction, and nothing on this page is legal or tax advice. Filing fees, deadlines, and statutory references are current as of the last-updated date shown above and can change. Confirm current requirements with the relevant state agency before you file.
