You don’t need an LLC to run a side business. The moment money starts coming in, the law already treats you as a sole proprietor by default, with no paperwork required. The real question is whether you should form one, and the answer turns on two things: how much personal risk your side business creates, and how much profit it generates. If the business signs contracts, handles clients’ property, sells physical products, or makes enough money that self-employment tax is becoming painful, an LLC is usually worth the few hundred dollars a year it costs to maintain. If you tutor a few kids on weekends or sell crafts twice a year, you can probably skip it and rely on insurance instead.
What You’re Risking Without One
A sole proprietorship is the default, and its appeal is that there’s nothing to file and nothing to maintain. The catch is that there’s no legal separation between you and the business. Business debts are your debts. A lawsuit against the business is a lawsuit against you personally. If the side hustle racks up a $50,000 obligation or loses in court, the creditor can go after your personal bank accounts, your home, and your retirement savings.
For a genuinely low-risk venture, that exposure may be acceptable. Online tutoring with a webcam doesn’t generate many ways to get sued. The calculus shifts the moment you start taking on clients, signing contracts, handling other people’s property, or selling physical products. At that point the simplicity of operating with no entity becomes the biggest vulnerability of operating with no entity.
What an LLC Actually Does for You
Forming an LLC creates a separate legal entity that can own property, enter contracts, and be sued independently of you. If the business goes under or loses a judgment, the creditor generally can’t reach your personal assets. The business’s liabilities stay with the business. This barrier is often called the corporate veil, and it’s the main reason most side business owners form an LLC in the first place. It doesn’t make the business risk-free; it caps how much of your personal life a business failure can take with it.
An LLC also opens up tax flexibility that a sole proprietorship doesn’t have. By default, the IRS treats a single-member LLC as a “disregarded entity,” meaning the business doesn’t file its own return and all profits and losses flow to your personal Form 1040 on Schedule C.1Internal Revenue Service. LLC Filing as a Corporation or Partnership At that stage, your tax filing looks almost identical to a sole proprietor’s. The difference comes later: once the business consistently generates meaningful profit, you can elect to have the LLC taxed as an S-Corporation by filing Form 2553. That election splits your income into a “reasonable salary” subject to payroll taxes and a distribution that isn’t subject to self-employment tax, which can save thousands of dollars per year on net profit in the mid-five figures and up. A sole proprietor can’t make that election.
Self-Employment Tax Applies Either Way
Switching from sole proprietor to default-taxed LLC doesn’t change your tax bill. Either way, you owe self-employment tax of 15.3%: 12.4% for Social Security on earnings up to $184,500 in 2026, plus 2.9% for Medicare on all net earnings with no cap.2Social Security Administration. Contribution and Benefit Base When you work for an employer, your company pays half of that. When you work for yourself, you pay both halves.3Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) You can deduct half of what you pay when calculating your adjusted gross income.4Internal Revenue Service. Topic No. 554, Self-Employment Tax You’ll also owe quarterly estimated payments if you expect to owe $1,000 or more in tax for the year.5Internal Revenue Service. Topic No. 306, Penalty for Underpayment of Estimated Tax For tax year 2026, those payments are due April 15, June 15, September 15, and January 15, 2027.6Taxpayer Advocate Service. Making Estimated Payments
Where the Protection Falls Apart
The LLC’s liability shield has real limits, and misunderstanding them is one of the most common mistakes side business owners make.
Personal guarantees are the clearest exception. If you sign a personal guarantee on a business loan or a lease, you’ve voluntarily stepped outside the LLC’s protection for that specific obligation. Banks routinely require personal guarantees from small LLC owners, so read everything you sign.
Courts can also disregard the LLC through a process called piercing the corporate veil. The most common trigger is commingling funds: paying personal bills from the business account, running personal expenses through the company card, or never opening a separate business account at all. When personal and business money flow through the same channels, a court may decide the LLC was never truly separate from you and hold you personally liable for its debts.
Finally, an LLC doesn’t shield you from your own wrongdoing. If you personally injure someone, commit fraud, or make a professional error, you’re liable regardless of your business structure. Every state holds professionals personally responsible for their own malpractice. For consultants, designers, developers, healthcare providers, and anyone else selling expertise, the LLC does not protect you from your own work.
When to Form One and When to Skip It
Not every side business justifies the cost. If you do occasional freelance writing, sell handmade crafts at a market twice a year, or tutor a few students on weekends, the liability exposure may be low enough that a general liability policy covers you adequately at a lower cost than running an LLC. Annual compliance fees, tax preparation, and administrative upkeep are real costs that eat into slim margins.
The decision tips toward forming an LLC when any of the following are true:
- You sign contracts with clients or vendors.
- You carry inventory or sell physical products.
- You perform services where mistakes could cause financial harm to a client.
- You work on other people’s property.
- Your net profit is high enough that an S-Corp tax election would save you meaningful money. For many side businesses, that threshold sits somewhere around $60,000 to $80,000 in annual net profit, though the exact number depends on what a reasonable salary looks like in your field.
At that point, a few hundred dollars a year in maintenance is cheap compared to the liability protection and tax flexibility you get.
What Forming and Maintaining One Costs
An LLC is formed at the state level by filing a document, usually called the Articles of Organization, with your state’s business filing office.7U.S. Small Business Administration. Register Your Business Filing fees range from about $40 to $500 depending on the state, and a few states tack on publication fees that can add $50 to $1,000. You’ll also designate a registered agent to receive legal documents on the LLC’s behalf. You can serve as your own agent in most states, but that puts your home address on the public record; commercial registered agent services run $50 to $300 per year.
A single-member LLC with no employees can technically use the owner’s Social Security number for federal tax reporting, but in practice you should get a free Employer Identification Number from the IRS.8Internal Revenue Service. Single Member Limited Liability Companies Most banks require one to open a business account.
You should also draft an operating agreement, even for a single-member LLC. A few states require one, but the real reason to have one is liability protection: an LLC without an operating agreement looks a lot like a sole proprietorship to a skeptical judge.9U.S. Small Business Administration. Basic Information About Operating Agreements A few pages covering ownership, profit distribution, management authority, and dissolution is enough for most side businesses.
The ongoing obligations are modest but easy to overlook. Most states require an annual or biennial report with a fee ranging from nothing to several hundred dollars, and some states impose a flat franchise tax regardless of whether the business earned a dime that year. Failing to file can lead the state to administratively dissolve the LLC, which strips the liability protection you paid for. The single most important ongoing task is keeping personal and business money completely separate: a dedicated business bank account, every business transaction through it, and no personal expenses mixed in.
One compliance item you can take off the list: the Corporate Transparency Act originally required most LLCs to report their beneficial owners to FinCEN, but an interim final rule published in March 2025 exempted all entities created in the United States. Domestic LLCs do not need to file beneficial ownership reports in 2026.10FinCEN.gov. Beneficial Ownership Information Reporting
Insurance and Local Rules Are Not Optional
An LLC protects your personal assets from business liabilities, but it doesn’t protect the business itself and it doesn’t protect you from your own professional mistakes. If a client sues the LLC for $200,000 and wins, the LLC’s bank account and equipment are fair game. A general liability policy typically costs $300 to $1,000 per year for a small side business and covers claims that would otherwise clean out everything the business owns.11U.S. Small Business Administration. Get Business Insurance For client-facing work, professional liability or errors-and-omissions coverage picks up what the LLC can’t.
Forming an LLC also doesn’t override local zoning or HOA rules. Most municipalities require a home occupation permit before you can legally run a business from a residential property, and HOA covenants may prohibit home businesses entirely. Those restrictions survive regardless of your business structure, so check your local zoning office and HOA rules before you file, because an LLC won’t help if you aren’t legally allowed to operate from your address in the first place.