Updated August 7, 2026. Quick answer: the personal cover you already carry is probably not standing behind your business, and the reason is mechanical rather than mean-spirited. A personal umbrella sits on top of your home and auto policies — so if those exclude business liability, the umbrella has nothing underneath it to extend. Wisconsin’s insurance regulator states it precisely: “most personal umbrella policies added to a homeowners or personal auto insurance policy will cover liability stemming from business activities and business property only if covered by the basic policies.” For a one-person consultancy the two coverages that answer different questions are general liability (someone is hurt or something is damaged) and professional liability, also called errors and omissions (your work caused financial harm). Neither is included in the other.
The gap in the cover you already have
Two official consumer guides describe the same shape, both hedged, and the hedges are worth keeping.
Wisconsin’s Office of the Commissioner of Insurance, on the home policy: “Your homeowners policy usually does not cover business-related liability, for example, if a customer or supplier is injured on your property.” And on relying on personal policies for business use: “if you are relying on either a personal auto insurance or personal umbrella liability policy to provide you with protection for your company’s use of vehicles, look closely at the provisions, as business-related liability may be excluded.”
The NAIC puts it the same way about home-based businesses: “Homeowners’ or renters’ insurance policies are rarely adequate to cover the unique needs of a home-based business… These policies tend to exclude business-related liability claims from persons injured on your property.”
Notice that neither regulator says never, and neither will we. They say usually, tend to and may be excluded, because policy forms differ. Wisconsin’s own instruction is the one to act on: “Always check your policy to see how it defines business and business property or ask your agent.” The word to look up in your own policy is how it defines business — that definition, not the umbrella’s limit, is what decides this.
This is the piece our sizing pages do not cover, and now wire to: how much umbrella cover to carry and what a million-dollar net worth actually needs are both about your personal exposure. Consulting income creates a second exposure that those pages deliberately do not size.
The two coverages, and the question each answers
General liability — described by Wisconsin OCI as Commercial General Liability, which “covers four categories of events for which you could be held responsible: bodily injury; damage to others’ property; personal injury, including slander and libel; and false or misleading advertising.” The everyday consulting version is physical and unglamorous: a client’s equipment damaged on site, someone tripping at an event you ran.
Professional liability / errors and omissions — the NAIC describes it as covering “errors and omissions such as failure to provide appropriate advice, errors in the delivery of professional services causing harm and failure to meet professional standards of practice”, and names consultants explicitly among the providers it is for. This is the one that matters most for advice work, and it is the one most often assumed to be included.
They are not substitutes, and the packaged small-business policy does not quietly contain both. Wisconsin OCI is explicit that a business owner’s policy “does not cover professional liability (liability claims arising from wrongful practice by professionals), auto insurance, worker’s compensation, health, or disability insurance. These must be purchased separately.”
The certificate your client asks for
For most one-person consultancies the forcing event is not a claim. It is a client’s procurement process asking for a certificate of insurance before the contract is signed, usually naming a general liability limit and sometimes a professional liability one. The requirement is contractual rather than legal — it is the client’s risk policy, not a rule about consulting — which means it is occasionally negotiable and always worth reading before you sign, because a limit you agreed to carry is a limit you have agreed to keep carrying for the life of the contract.
What to actually do
- Read the definition of business in your existing homeowners policy, then the umbrella’s underlying-coverage requirement. That pair answers whether you have a gap.
- Separate the two questions — could someone be physically hurt or something damaged, and could my advice cost a client money? — and price them separately.
- Check what your contracts already commit you to before buying, so you are not insured for less than you promised.
- Keep the entity question separate. An LLC and insurance solve overlapping but different problems, and the honest test there is what specific thing you are protecting.
Sources and limits
Quotations read 2026-08-07 from two official consumer sources: the Wisconsin Office of the Commissioner of Insurance, Consumer’s Guide to Insurance for Small Business Owners, PI-085 (R 10/2024), and the National Association of Insurance Commissioners, Small Business Insurance. Both hedge, and we have preserved the hedges: no source states an absolute exclusion, and this page does not either. Policy forms vary by insurer and by state, and Wisconsin’s guide describes Wisconsin’s market. We sell no insurance, take no commission, and name no insurer or broker anywhere on this page. Nothing here prices coverage — premiums for a one-person consultancy vary too much by trade and by state for a national figure to mean anything.
The certificate a client asks for usually arrives in the middle of a wider transition: what changes when you go from employee to consultant.
And a board seat is a different exposure again, which your own cover does not reach: the D&O questions to ask before accepting one.