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General liability and professional liability sound like the same thing with different adjectives. They are not. One covers what your business does to someone else’s body or property. The other covers what your business gets wrong in the work itself. Mixing them up is one of the most common and most expensive mistakes a new business owner makes.
What general liability actually covers
General liability (GL) is the policy most people picture when they hear “business insurance.” It pays for third-party bodily injury, third-party property damage, and personal and advertising injury like libel or slander. A customer slips on your wet floor. Your employee knocks over a client’s antique vase. A competitor claims your ad copy defames them. That is GL territory.
The standard GL policy most small businesses buy carries $1 million per occurrence and $2 million in aggregate. Industry data puts the median premium around $45 per month, or roughly $540 a year, for that level of coverage. Nearly every lease, vendor contract, and client agreement will ask you to prove you have it, which is why the certificate of insurance has become such a routine piece of business paperwork. For the full cost picture, see our guide to what general liability insurance costs small businesses.
What professional liability actually covers
Professional liability, also called errors and omissions (E&O), covers claims that your work was negligent, incomplete, or just wrong. A consultant’s bad advice costs a client a contract. A designer misses a deadline and the launch fails. An accountant’s error triggers an IRS penalty. GL does not touch any of this. The physical-world stuff is GL. The work-product stuff is PL.
This is the policy service businesses tend to underestimate. If your product is your expertise, a client does not need to get physically hurt to sue you. They just need to believe your mistake cost them money. Median professional liability premiums run roughly $60 to $88 per month, depending on the profession and the limits. Our breakdown of professional liability insurance costs has the profession-by-profession detail.
Who needs which
Almost every business with a physical presence or customer foot traffic needs general liability. If customers visit your shop, you visit theirs, or you sell a physical product, GL is the starting point. Landlords and clients will often require it in writing.
Professional liability is for businesses that sell advice, expertise, or a deliverable: consultants, agencies, accountants, engineers, architects, IT firms, real estate agents, insurance agents, and increasingly anyone who builds software or manages data for clients. Some professions are required by state licensing boards or client contracts to carry it.
Many businesses need both. A marketing agency has an office where a client could trip (GL) and produces campaigns that could underperform or misrepresent something (PL). A home inspector walks a property (GL) and writes a report that could miss a defect (PL). If you do work at a client’s site or deliver a finished product, assume you need both until an advisor tells you otherwise.
Can one policy cover both
Some business owner’s policies and professional packages bundle GL with E&O, and some insurers offer combined forms for specific industries. But a standard GL policy never includes professional liability. If your agent says you are “fully covered” and your business gives advice, ask specifically whether errors and omissions is on the policy. This is the gap that catches people.
The claims look different too
GL claims tend to be event-driven and visible: the fall, the broken window, the damaged equipment. PL claims tend to arrive months later as a letter from a lawyer, long after the project ended. PL policies are usually written on a claims-made basis, which means the policy in force when the claim is filed is the one that responds, not the one in force when the work was done. That detail matters if you ever switch carriers or retire a policy, and it is one more reason to keep coverage continuous once you buy it.
When a client asks for proof of insurance, by the way, they are usually asking for a certificate of insurance, which lists exactly which policies you carry and their limits. It takes an agent a few minutes to issue one, and most clients will not start work without it.
What to buy first
If you are choosing one policy this month: businesses with premises, products, or on-site work should buy general liability first. Businesses whose main risk is bad advice or a bad deliverable should buy professional liability first. Then add the other one as soon as cash flow allows. The two together cover the two ways a small business most often gets sued, which is the whole point of buying insurance in the first place.
