The short version: an LLC protects your personal assets from business debts and lawsuits. A sole proprietorship does not. If your business has any chance of being sued, sells a physical product, or carries debt, an LLC is almost always the right move.
But the answer is not universal. There are real situations where staying a sole proprietor makes sense, and there are situations where neither is the right structure at all. Here is how to actually decide.
What is a sole proprietorship?
A sole proprietorship is the default. If you start selling a service or product under your own name without filing any paperwork, you are a sole proprietor. There is no legal separation between you and the business. You report income on Schedule C with your personal taxes, and if the business is sued, your personal bank account, your house, and your car are on the table.
The upside: zero setup cost, zero ongoing paperwork, and the simplest possible tax filing. The downside is everything in the previous paragraph.
What is an LLC?
A Limited Liability Company is a legal entity that exists separately from you. It files its own paperwork with your state (typically $50 to $500 to form, plus an annual fee), gets its own bank account, and signs contracts in its own name. The key feature is the liability shield: if someone sues the LLC, they can only reach the LLC's assets, not yours personally. The shield is not absolute, but it works in the vast majority of disputes.
For tax purposes, a single-member LLC is treated the same as a sole proprietorship by default. Your income still flows to your personal return on Schedule C. The IRS does not care that you formed an LLC unless you specifically elect S-corp or C-corp treatment.
When does an LLC make sense?
An LLC is the right call if any of these are true:
- You sell a physical product that could injure someone
- You provide a service where a mistake could cost the client real money
- You sign contracts, leases, or loans in the business name
- You have employees or contractors
- You own business equipment, inventory, or real estate
- You have any personal assets you would lose sleep over (house, retirement accounts, savings)
In practice, this is most businesses. Even a freelance copywriter has exposure: if a client says your work caused them to lose a deal, they can sue you personally as a sole proprietor.
When does a sole proprietorship make sense?
There are real situations where filing an LLC is overkill:
- You are testing a side hustle that earned less than a few thousand dollars last year and you genuinely do not know if it will continue
- Your work has near-zero liability surface (e.g., you tutor algebra on weekends and have no contracts)
- You have minimal personal assets to lose
The honest read: if your business outlasts the first year, the calculus changes. Most people who start as a sole proprietor convert to an LLC within 18 months, and the conversion is straightforward.
How much does it cost to form an LLC?
Filing fees vary by state. The cheapest are Kentucky ($40), Arkansas ($45), and Mississippi ($50). The most expensive are Massachusetts ($500), Tennessee ($300+), and Illinois ($150 plus a $75 annual fee). California adds an $800 annual franchise tax that hits even if the LLC made no money. Most states are in the $100 to $200 range.
Beyond the filing fee, you may want a registered agent service ($50 to $300 per year), and you may want to register a DBA name ($10 to $100 depending on state). You do not need a lawyer to form an LLC for a simple single-member business, but you should at least have an operating agreement drafted, even if you are the only member.
What an LLC does not protect you from
The liability shield has limits. An LLC does not protect you if:
- You personally sign a guarantee on a loan or lease (very common)
- You commit fraud or intentional wrongdoing
- You mix personal and business funds so badly that a court "pierces the corporate veil"
- You are personally negligent in providing a professional service (doctors, lawyers, architects)
The veil-piercing risk is real. The single most important habit after forming an LLC is to never pay personal expenses out of the business account or vice versa. Get a separate business bank account on day one.
What about an S-corp?
An S-corp is not an entity type. It is a tax election that an LLC (or corporation) can make. The point of an S-corp election is to reduce self-employment tax once your business profit exceeds roughly $40,000 to $50,000 per year. Below that threshold, the paperwork and payroll burden of an S-corp typically eats up the tax savings.
If your LLC is profitable enough that an S-corp election would help, you are also at the point where talking to a CPA pays for itself.
The bottom line
For most small business owners, the LLC is the right structure from day one. The cost is small, the protection is real, and the tax treatment is the same as a sole proprietorship by default. The one situation where it is not the answer is when the business is genuinely a low-stakes experiment that may not survive its first year.
If you are ready to form one, our DIY documents tool can generate state-specific LLC formation paperwork in minutes. If your situation is more complex (multi-member, raising capital, professional licensing), find a business attorney through our match engine for a focused consultation.