The main difference between an LLC and a sole proprietorship is personal liability. A sole proprietor and the business are the same legal person, so creditors and plaintiffs can reach personal bank accounts, vehicles, and real estate to satisfy business debts. A limited liability company is a separate legal entity, and that separation generally keeps business obligations away from the owner’s personal assets. Almost every other contrast — formation paperwork, ongoing fees, tax options, how the business gets sold or passed on — follows from that one distinction.
Personal Liability Is the Core Difference
A sole proprietorship offers zero separation between you and your business. If the business gets sued, can’t pay a vendor, or defaults on a lease, creditors can go after your personal bank accounts, your car, and your home. The simplicity works fine for low-risk operations, but a single bad contract or accident could wipe out savings you’ve spent decades building.
An LLC puts a wall between your personal finances and business obligations. If the company takes on debt or loses a lawsuit, creditors can generally reach only what sits inside the LLC. This protection is the single biggest reason people form LLCs rather than operating as sole proprietors.
The wall isn’t indestructible. Courts can set the protection aside through what’s called “piercing the corporate veil.” This happens most often when an owner treats the LLC like a personal piggy bank: paying personal credit card bills with business funds, skipping a separate business bank account, or mixing personal and company money so thoroughly that the LLC looks like a sham. Fraud or deliberate undercapitalization can also give a court reason to hold the owner personally responsible.
One boundary worth knowing: an LLC does not shield you from your own professional malpractice. If you are a doctor, lawyer, accountant, or similar professional, a client who sues you over the quality of the work you personally did can reach your personal assets regardless of the LLC. The LLC protects against general business debts like vendor payments, lease obligations, and employment disputes.
What It Takes to Start Each One
Starting a sole proprietorship takes almost no effort. If you begin doing business under your own legal name, you don’t file anything with the state. You are a sole proprietor the moment you start earning revenue. If you want to operate under a different name, you register a “doing business as” (DBA) name with a local government office. DBA fees are modest, and the process is straightforward.
Forming an LLC takes paperwork and a meaningful filing fee. You submit a document called the articles of organization — some states call it a certificate of formation — to the state business filing office.1Cornell Law Institute. Certificate of Formation The filing lists the company name, business address, and a registered agent authorized to accept legal notices on the LLC’s behalf. Most states charge between $50 and $200, though a handful charge as much as $500. Online filings are usually approved within a few business days.
You should also draft an operating agreement. This internal document spells out ownership percentages, how decisions get made, what happens if a member wants to leave, and how profits are divided.2U.S. Small Business Administration. Basic Information About Operating Agreements California, Delaware, Maine, Missouri, and New York legally require a written operating agreement. Even where it’s optional, skipping it is a mistake. Without one, your state’s default LLC rules govern, and those defaults rarely match what the owners actually intended.
Ongoing Compliance
A sole proprietorship has virtually no ongoing state paperwork. You file your federal tax return each year, keep your DBA current if you have one, and that’s about it.
Most states require LLCs to file an annual or biennial report updating basic information like the business address and registered agent. Fees for these reports range from nothing in some states to several hundred dollars in others. Miss the filing, and the state can strip the LLC of its good standing. Continued noncompliance in most jurisdictions leads to administrative dissolution, which suspends the LLC’s authority to do business. If you keep operating after dissolution, you risk losing the personal liability protection that made the LLC worth forming.
LLCs should also keep certain internal records at their principal office: the articles of organization and any amendments, the operating agreement, a current list of members and their contributions, and recent tax returns. Those records matter if liability protection is ever challenged in court, because they show the LLC operating as a genuine separate entity.
How Each Is Taxed
For federal tax purposes, both structures are “pass-through” entities by default. The business itself doesn’t pay income tax. All profit flows to your personal return and gets taxed at your individual rate. You report business income and expenses on Schedule C, attached to Form 1040.3Internal Revenue Service. Instructions for Schedule C (Form 1040) The IRS treats a single-member LLC the same as a sole proprietorship unless you elect otherwise.4Internal Revenue Service. Limited Liability Company (LLC) Multi-member LLCs are classified as partnerships by default and file Form 1065, with each member receiving a Schedule K-1.
Both structures owe self-employment tax on net business earnings, calculated on Schedule SE. The rate is 15.3%, covering 12.4% for Social Security and 2.9% for Medicare.5Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) The Social Security portion applies only up to $184,500 in net earnings for 2026; the Medicare portion has no cap.6Social Security Administration. Contribution and Benefit Base If your net self-employment earnings exceed $200,000 (or $250,000 if married filing jointly), an additional 0.9% Medicare tax applies to the amount above that threshold.7Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates You can deduct half of your self-employment tax as an adjustment to gross income on Schedule 1.8Internal Revenue Service. Topic No. 554, Self-Employment Tax
Because neither structure withholds taxes from a paycheck, both sole proprietors and LLC owners expecting to owe at least $1,000 in federal tax must make quarterly estimated payments. For 2026, those are due April 15, June 15, September 15, and January 15, 2027.
The S-Corp Election Only an LLC Can Make
This is where an LLC gains a tax advantage a sole proprietorship cannot access. An LLC can elect to be taxed as an S-corporation by filing Form 2553, or as a C-corporation by filing Form 8832.9Internal Revenue Service. Entities 3 A sole proprietorship cannot make either election.
The S-corp election matters most for self-employment tax. As a sole proprietor, you pay the 15.3% self-employment tax on your entire net profit. With an S-corp election, you pay yourself a salary subject to payroll taxes and take remaining profits as distributions, which are not subject to self-employment tax. If the business nets $150,000 and you pay yourself a $70,000 salary, self-employment taxes apply to the $70,000 rather than the full $150,000.
The IRS does not let you set that salary artificially low. The salary must be “reasonable,” meaning comparable to what you’d pay someone else to do the same work.10Internal Revenue Service. S Corporation Employees, Shareholders, and Corporate Officers Courts have repeatedly ruled against owners who tried to minimize wages and reclassify the bulk of their income as distributions. Set it too low, and the IRS can reclassify distributions as wages and assess back taxes plus penalties.
To qualify for S-corp status, the LLC must be a domestic entity with no more than 100 members, all of whom are individuals or certain qualifying trusts, and the LLC can have only one class of ownership interest.11Internal Revenue Service. S Corporations An S-corp election also means running payroll, filing quarterly payroll tax returns, and issuing W-2s. The tax savings need to be large enough to justify that extra work, which typically means the election doesn’t make sense until net profits consistently exceed $40,000 to $50,000.
Ownership, Continuity, and Selling the Business
A sole proprietorship is as simple as management gets. You make every decision, instantly, with no one to consult. The tradeoff is that the business depends entirely on you, and there is no formal mechanism for someone else to step in.
An LLC can be member-managed, where the owners handle daily operations, or manager-managed, where the members hire outside professionals to run things. The operating agreement defines who has authority over what: signing leases, making purchases over a certain dollar amount, taking on debt, or admitting new members. For a single-member LLC, the distinction is academic. For multi-member LLCs, it prevents the kind of disputes that destroy partnerships.
Ownership transfer reveals a stark difference. A sole proprietorship can’t be sold as a going concern in any clean sense. Because the business is legally inseparable from the owner, “selling” it means liquidating individual assets like equipment, inventory, and maybe a customer list. The business name, contracts, and reputation are difficult to transfer.
An LLC is its own legal entity. Membership interests can be sold, transferred, or inherited, and the operating agreement typically sets the terms, including rights of first refusal for existing members. The business keeps operating through ownership changes, which makes an LLC a far more practical structure for anything you’d like to eventually hand off or sell.
Which One Fits Your Situation
A sole proprietorship works for freelancers, side projects, and low-risk businesses where the cost and paperwork of an LLC aren’t justified by the liability exposure. A freelance writer or a tutor with no employees and no significant contracts gets a genuine advantage from the simplicity.
An LLC starts making sense once any of these become true: you’re signing contracts with meaningful financial exposure, you’re hiring employees, clients or customers visit a physical location, your net profits are high enough that an S-corp election would save real money on self-employment tax, or you’re building something you’d eventually like to sell. The annual cost of maintaining an LLC — filing fees plus a registered agent if you use a service — is modest compared with the liability protection and tax flexibility you gain.
Converting Later
Many businesses start as sole proprietorships and convert once revenue, liability, or hiring makes the upgrade worthwhile. The conversion itself is straightforward: file articles of organization with your state, pay the filing fee, and draft an operating agreement. For federal tax purposes, converting to a single-member LLC that you don’t elect to treat as a corporation is a non-event. You’re still a disregarded entity using Schedule C, and you generally keep the same taxpayer identification number. If the new LLC will have employees and the sole proprietorship didn’t, you’ll need a new EIN. Update your business bank account, contracts, and licenses to reflect the new entity name, and formally assign existing contracts, leases, or permits to the LLC so you don’t keep operating under the old arrangements by default.