A sole proprietorship is the simplest way to run a business: you and the business are legally the same, and you need no state registration to become one. A limited liability company (LLC) is a separate legal entity that you register with your state, and in most cases it shields your personal assets from the business's debts and lawsuits. For federal income tax, a one-owner LLC is usually taxed the same way as a sole proprietorship.
This guide is for freelancers, side-business owners, and new founders who are deciding whether to form an LLC now or wait. You will see what each structure does about liability and taxes, what the paperwork costs, and how to decide using your own risk level rather than a rule of thumb.
What a sole proprietorship is
The U.S. Small Business Administration (SBA) explains that sole proprietorships do not produce a separate business entity. You report business income and expenses on your personal tax return, and you can be held personally liable for the business's debts and obligations.
That last point is the main trade-off. If a customer wins a lawsuit or a supplier sues over an unpaid bill, a court can generally reach your personal assets, not just money in the business account.
On the plus side, there is no formation fee, no annual report, and little recordkeeping beyond what any business needs. You may still need a local business license, a trade name registration (often called a DBA, short for "doing business as"), or both. DBA rules vary by state, county, and city.
What an LLC is
An LLC is formed by filing articles of organization with the state, usually through the Secretary of State's office, and naming a registered agent in that state. The SBA notes that LLCs protect you from personal liability in most instances, and that registration usually costs less than $300 but varies by state.
Many states recommend or require an operating agreement, a document that sets out ownership, how profits are divided, and how decisions are made. Even a one-person LLC benefits from one, because it shows you treat the company as a separate entity.
Some states charge ongoing costs such as annual reports, minimum franchise taxes, or fees based on revenue. These differences are large enough that the same LLC can cost a modest amount in one state and meaningfully more in another. Look up your state's current fee schedule before you file.
Side-by-side comparison
| Sole proprietorship | LLC (single owner) | |
|---|---|---|
| Legal separation from you | None | Yes, if formalities are followed |
| Personal liability for business debts | Yes | Limited in most cases |
| Formation | Automatic when you start doing business | File with the state, name a registered agent |
| Upfront cost | Possibly a DBA or license | State filing fee plus any required licenses |
| Ongoing cost | Little | Varies by state: annual reports, franchise or other fees |
| Federal income tax | Schedule C on your personal return | Same by default (disregarded entity) |
| Self-employment tax | Yes | Yes, by default |
| Tax options | Limited | Can elect to be taxed as a corporation |
| Operating agreement | Not applicable | Recommended, required in some states |
How taxes work for each
Both structures are "pass-through" for income tax. The business pays no separate federal income tax; profit flows to your personal return. The IRS says a single-member LLC is by default a disregarded entity, separate from its owner for income tax purposes unless it files Form 8832 to be taxed as a corporation, and that an individual owner pays self-employment tax the same way a sole proprietor does.
Self-employment tax is how you pay Social Security and Medicare when you have no employer. The IRS rate is 12.4% for Social Security and 2.9% for Medicare. The Social Security part applies only up to an annual limit that changes each year, so check the current figure on irs.gov. You can deduct half of the tax when you figure your adjusted gross income.
Worked example
Say you earn a $60,000 net profit after business expenses. This is hypothetical, and income tax is left out.
- Schedule SE multiplies net earnings by 92.35%: $60,000 x 0.9235 = $55,410.
- Social Security portion: $55,410 x 12.4% = about $6,871.
- Medicare portion: $55,410 x 2.9% = about $1,607.
- Total self-employment tax: about $8,478.
The result is identical whether you operate as a sole proprietor or as a default single-member LLC. Forming an LLC does not lower this bill by itself. What changes is the liability picture and the paperwork.
The SBA notes that an LLC can also be taxed as a C corporation or S corporation. An S corporation election changes how owner pay is handled for payroll taxes and adds compliance work. It is a conversation for a CPA once profit is meaningful, not a day-one decision.
Getting an EIN
An employer identification number (EIN) is a nine-digit federal tax ID for a business. The IRS says you never have to pay a fee for one and warns about websites that charge for it. You can apply free on irs.gov.
You generally need an EIN to hire employees, operate a partnership or corporation, or pay certain excise taxes. The IRS says most new single-member LLCs will need one, though an LLC with no employees and no excise tax obligations does not strictly require one. A sole proprietor with no employees can often use a Social Security number, but many owners get an EIN anyway so they do not give out their SSN on forms and to banks.
If you are forming an LLC, the IRS says to form it with your state first, then apply for the EIN.
How to decide
Work through these questions in order.
- How likely is a claim? A freelance writer working from home faces less risk than a contractor who works in customers' homes or a business that serves food.
- How much could you lose? Count your home equity, savings, and other assets a creditor could target.
- Will you sign leases or loans? Landlords and lenders often require a personal guarantee, which erases much of an LLC's protection for that debt.
- Can you afford the ongoing costs? Add the filing fee and your state's yearly charges to the cost of insurance you may also need.
- Do you have partners? Two or more owners should use a written agreement of some kind. An LLC with an operating agreement is a common vehicle.
If you are still shaping the business itself, our guide to writing a simple business plan helps you estimate whether the numbers support the added costs.
Common mistakes
- Treating an LLC as a shield for everything. It generally does not cover your own negligence or debts you personally guarantee, and courts can look past an LLC that is not run as a separate business.
- Mixing personal and business money. Paying personal bills from the LLC account can weaken the separation a court expects.
- Skipping insurance. An LLC is not a substitute for liability coverage. Ask an insurance agent what your business needs.
- Paying for an EIN. The IRS issues them for free.
- Ignoring state deadlines. Missed annual reports can lead to penalties or loss of good standing.
- Forgetting the personal side. A sole proprietorship has no existence apart from you, so consider what happens to it if you cannot work. Our guide to writing a simple will covers the basics of passing on assets.
Frequently asked questions
Can I start as a sole proprietor and form an LLC later?
Yes. Many owners start with the simplest structure and form an LLC when revenue, risk, or contracts grow. Update your bank account, licenses, insurance, and contracts to the LLC's name when you do, and ask the state or an attorney about any steps for transferring assets.
Does an LLC save on taxes?
Not by default. A single-member LLC is taxed like a sole proprietorship for federal income tax, and you still pay self-employment tax. Potential savings come from elections like S corporation status, which a tax professional can model for your numbers.
Do I need a lawyer to form an LLC?
Not always. Most states let you file online through the Secretary of State. An attorney is worth consulting if you have partners, significant assets, or a complex situation.
Does the structure affect my state taxes?
It can. States differ in how they tax income and in what fees they impose on LLCs. Check your state revenue department and Secretary of State.
Next steps
- Look up your state's LLC filing fee and annual costs on your Secretary of State's website.
- List the personal assets you would want to protect and any guarantees a landlord or lender may require.
- Ask an insurance agent about liability coverage for your type of work, whichever structure you choose.
- If you form an LLC, write an operating agreement, then apply for an EIN directly on irs.gov.
