Key takeaways
What this article covers, in order:
- What each structure actually is
- How the IRS taxes each one
- Liability: the main reason to form an LLC
- Worked example: a freelance designer with $90,000 of profit
- Side-by-side summary
- Common mistakes to avoid
A sole proprietorship and a single-member LLC are taxed the same way by default: the IRS ignores the LLC and you report the profit on Schedule C of your personal return, paying self-employment tax on it. The real difference is legal: an LLC is a separate entity registered with your state that can keep business debts and lawsuits away from your personal assets, while a sole proprietorship is just you doing business, with nothing between the business and your house, car or savings.
So the question is less about tax and more about risk, cost and paperwork. Here is how the two compare, when the LLC is worth its fees, and what changes if you later elect S corporation taxation.
What each structure actually is
Sole proprietorship
If you start selling services or products on your own and do nothing else, you are a sole proprietor. There is no state filing to create the business. You may still need a local business license, a sales tax permit, or an assumed-name (DBA) registration if you trade under a name other than your own, but the business has no legal existence separate from you.
Limited liability company (LLC)
An LLC is created when you file formation documents (usually called articles of organization or a certificate of formation) with your state. States charge a filing fee and most require an annual or biennial report, sometimes with a separate franchise or privilege tax. Those costs vary widely from state to state, so check your Secretary of State's fee schedule before you decide.
How the IRS taxes each one
This is where most people are surprised. According to the IRS, a single-member LLC is, by default, a disregarded entity for income tax purposes. That means:
- Same return: both a sole proprietor and a single-member LLC owner report business income and expenses on Schedule C (Form 1040).
- Same self-employment tax: both pay 15.3% self-employment tax (12.4% Social Security plus 2.9% Medicare) on net earnings. For 2026, the Social Security part applies to the first $184,500 of combined wages and self-employment earnings; the Medicare part has no cap.
- Same deductions: both can deduct the employer-equivalent half of self-employment tax when figuring adjusted gross income, and both may qualify for the qualified business income (QBI) deduction of up to 20%, which the 2025 tax law made permanent.
Two exceptions are worth knowing. First, for employment tax and certain excise taxes, the IRS treats a single-member LLC as a separate entity, so if you hire employees the LLC itself is the employer. Second, a multi-member LLC is taxed as a partnership by default, which means a Form 1065 partnership return and a Schedule K-1 for each member. A sole proprietorship, by definition, has only one owner.
The S corporation election
An LLC can choose to be taxed as a corporation (Form 8832) or, more commonly for small businesses, as an S corporation (Form 2553). A sole proprietorship cannot make this election without first forming an entity. With S corporation status you become an employee of your own company: you must pay yourself a reasonable salary through payroll, and profit above that salary can be taken as a distribution that is not subject to Social Security and Medicare tax. The trade-off is a separate business tax return (Form 1120-S), payroll filings, and more bookkeeping discipline.
Liability: the main reason to form an LLC
As a sole proprietor, a business debt is your debt. If a supplier sues over an unpaid bill or a customer wins a judgment against the business, they can pursue your personal bank accounts and property.
An LLC generally limits that exposure to what the business owns. The protection has limits, though:
- Personal guarantees: if you personally guarantee a lease, loan or credit card, the LLC does not shield you from that obligation. Many lenders require guarantees from owners of young businesses.
- Your own acts: you remain responsible for your own negligence or professional errors. An LLC is not a substitute for liability or professional insurance.
- Commingling: if you run personal spending through the business account and keep no clear records, a court can disregard the LLC and reach your personal assets. Separate bank accounts and clean books are what make the shield hold up.
Worked example: a freelance designer with $90,000 of profit
Maya is a freelance UX designer in Austin. Her 2026 net profit, after business expenses, is $90,000. Ignoring state taxes and fees, here is what each option looks like for self-employment and payroll taxes.
Option 1: sole proprietor or single-member LLC (default tax treatment)
- Net earnings subject to self-employment tax: $90,000 x 92.35% = $83,115 (Schedule SE applies the 92.35% factor).
- Self-employment tax: $83,115 x 15.3% = about $12,717.
- She can deduct about half of that, roughly $6,358, in figuring adjusted gross income.
The tax result is identical whether or not she forms an LLC. The LLC only adds liability protection and the state's fees.
Option 2: LLC taxed as an S corporation
- Suppose a reasonable salary for her role and hours is $55,000.
- Social Security and Medicare on that salary (employee and employer shares combined): $55,000 x 15.3% = $8,415.
- The remaining profit is paid as a distribution, which is not subject to those taxes.
- Rough payroll-tax difference versus Option 1: $12,717 - $8,415 = about $4,302.
That figure is simplified. It ignores the corporate deduction for the employer share of payroll tax, state unemployment insurance, the cost of running payroll, the extra return preparation fee, and any state-level taxes on S corporations. It also depends entirely on the salary being defensible; the IRS expects S corporation owner-employees to be paid reasonable compensation before taking distributions. For many owners with modest profit, the savings disappear once those costs are counted. Run your own numbers with a CPA before electing.
Side-by-side summary
- Formation: sole proprietorship needs no state filing; an LLC requires a state filing and usually recurring reports.
- Cost: sole proprietorship is cheapest; an LLC adds state filing fees and, in some states, annual taxes or fees.
- Liability: sole proprietor is personally liable for business debts; an LLC generally limits liability to business assets, subject to the exceptions above.
- Default federal tax: the same Schedule C and self-employment tax for both (single-member LLC).
- Tax flexibility: only an LLC can elect S corporation or C corporation taxation.
- Owners: a sole proprietorship has one owner; an LLC can add members later.
- Credibility: some clients, banks and platforms prefer contracting with an entity, though this varies by industry.
On federal paperwork: since March 2025, FinCEN's rules exempt companies formed in the United States from beneficial ownership information (BOI) reporting, so that is no longer an extra filing for a new domestic LLC.
Common mistakes to avoid
- Forming an LLC for tax savings alone. On its own, a single-member LLC changes nothing on your federal return.
- Electing S corporation status too early. If profit is low, payroll costs and compliance can outweigh the tax saved.
- Mixing personal and business money. It weakens the liability shield and makes your Schedule C harder to support in an audit.
- Forgetting the annual report. Missing a state report or fee can lead to penalties and, eventually, administrative dissolution of the LLC.
- Assuming an LLC replaces insurance. It does not cover your own professional mistakes.
hellobooks< / a > -helps-whichever-structure-you-choose">How HelloBooks helps whichever structure you choose
Whichever route you take, the IRS and the liability shield both depend on records that keep business and personal money apart. HelloBooks connects your business bank account through bank feeds, uses AI to categorise transactions for your review, and produces the profit and loss statement you need for Schedule C or an S corporation return. You can track 1099 contractor payments, log business miles with an IRS-compliant mileage tracker, and snap receipts so expense claims are backed by documents. If you elect S corporation status, you will run payroll through a payroll provider and record the payroll journals in your HelloBooks ledger. If you later run more than one company, multi-entity books keep each one separate. Your CPA can review everything from the same set of books.
This is general information as of November 2026, not tax or legal advice. Check the official IRS and state sources or a qualified CPA or attorney for your situation.
