Professional liability insurance is priced from what you do for clients and how much money rides on it, since your profession sets the starting rate, and your revenue, the size of your contracts and the kind of clients you work for tell the insurer how large a claim could get. On top of that sit the choices you make, your limits, your deductible or retention and your retroactive date, plus your claims record and how the policy treats defense costs.
Two of those choices change the price in ways that aren’t obvious from the quote, and both can leave you with much less coverage than you think. The retroactive date decides how much of your past work is covered at all, and the defense terms decide how much of your limit is left for the client once the lawyers are paid. This guide spends the most time on those two.
Key takeaways
- Your profession sets the starting point, because the odds and size of a claim differ widely between, say, a bookkeeper and an architect.
- Revenue, contract size and client type matter because they measure how much money a mistake in your work could cost someone.
- Most professional liability is written on a claims-made basis, and the retroactive date controls how much of your past work is covered.
- Keeping your retroactive date when you renew or switch is usually worth more than any saving from resetting it.
- Check whether defense costs are paid inside or outside your limit, since that decides how far the limit really stretches.
What the insurer is pricing
First, the kind of claim you’re insuring against. The SBA describes professional liability as coverage that “protects against financial loss as a result of malpractice, errors, and negligence,” and it’s meant for businesses that provide services. The claims are about money, a missed deadline that cost a client a launch or a wrong figure in a report that cost them a deal, and they usually come with a defense bill whether or not you did anything wrong. Standard homeowners’ and renters’ policies don’t cover it, the NAIC notes, so a home-based consultancy can’t count on the house policy.
So the insurer is estimating two things: how likely a client is to claim that your work cost them money, and how much money could be involved if they do. Every factor below feeds one of those.
Your profession sets the starting point
The NAIC says “the type of business greatly influences liability premiums,” and in professional liability that’s especially true, because the size of a typical claim depends on what clients rely on you for. An error in a structural drawing, a missed tax filing and a disappointing logo are all professional mistakes, and they produce claims of very different sizes. California’s Department of Insurance calls classification “the first step to determine premium,” and for this coverage the classification is essentially your profession and the services you offer.
Describe those services fully. A marketing consultant who also manages clients’ ad budgets, a bookkeeper who also files payroll taxes and a salon that offers chemical treatments are each taking on a risk that a narrower description would miss, and a claim from a service you didn’t disclose is exactly the kind an insurer may dispute. The service you added last and mentioned least is still work a client can claim over.
Why does the insurer care about your biggest client?
Because the size of a claim tends to follow the size of the job: a mistake on a small project for a local shop usually costs that shop a limited amount, while the same mistake on a large contract for a big company can cost far more, which is why Corgi’s professional liability page lists “the size of your clients and contracts” among its price factors alongside your profession and revenue. Revenue tells the insurer how much work you do in a year, while contract size and client type tell it how much is riding on any one piece of it.
That cuts both ways. Taking on a much larger client can change your price at renewal, and it can also change the limit you need, since bigger clients often write a professional liability limit into the contract before work starts, the kind of clause how to read insurance requirements in a client contract walks through.
The retroactive date: the cheapest-looking trap
Here’s the trap: a claims-made policy generally won’t answer for work done before a date printed on it, and that date is the cheapest thing on the quote to give away. Most professional liability is written on a claims-made basis, and California’s Department of Insurance defines that as a liability policy where coverage applies to claims filed during the policy period, no matter when the loss occurred, subject to a retroactive date. That last clause is the one that matters for price. A claim made today about work you did before that date usually isn’t covered, even though the policy is in force when the claim arrives.
Now think about what that does to the insurer’s risk. A policy with a retroactive date of last month only has to answer for a month of past work, while one reaching back five years has to answer for five years of projects, any of which could still produce a claim, because clients often discover a professional mistake long after the work was delivered. A policy covering more past work has more to pay for, and pricing often reflects that, which is why a brand-new claims-made policy can look inexpensive in its early years and rise as the retroactive date gets older.
That’s also where owners hurt themselves. When a renewal or a competing quote comes in lower, the reason is sometimes a retroactive date reset to today, which quietly drops coverage for everything you did before, and the saving disappears the first time a former client calls. Corgi’s professional liability page gives the plain rule: keep the same retroactive date when you renew or switch, so past work stays covered, and since your quote shows the retroactive date, you can check it against your current policy’s declarations page before you compare prices.
Closing the business or stopping coverage raises a related question, because claims about past work can still arrive after a claims-made policy ends, and an extended reporting period, sometimes called tail coverage, gives you extra time to report them. Occurrence vs. claims-made policies explains tails, and how to switch business insurance without a gap covers timing a change, but the rule underneath both is the same: the longer you’ve been in business, the more past work the retroactive date is protecting.
Defense inside or outside the limit
That difference doesn’t always show up in the price line of a quote, but it changes what you’re buying. On many professional liability policies, defense costs come out of the limit, which means a long, expensive fight shrinks the money available to settle, even when you eventually win. Other policies pay defense on top of the limit. Look for the policy’s defense provision, or ask your insurer directly, and if the defense comes out of the limit, size the limit with that in mind.
Limits, deductibles and retentions
Limits are the dial you set directly, and how to choose liability limits covers picking one; a higher one usually costs more because the insurer could pay more, with Corgi’s professional liability page showing example options from $250,000 to $2 million per claim that illustrate the choices without recommending one.
On the other end, a deductible or retention is what you pay on a claim before the policy does. California’s guide treats a self-insured retention as similar to a deductible, though with a retention you typically pay defense and settlement costs yourself until it’s used up, and the NAIC’s rule holds here as elsewhere: higher deductibles typically mean lower premiums. Before you raise one, ask whether it applies to defense costs as well as settlements, because if it does, you’ll pay it even on a claim you beat, and how to choose a deductible explains how to weigh the trade.
When you compare two professional liability quotes, line them up on these points first.
| Check | What to look for |
|---|---|
| Services described | Every service you offer, including ones you added recently |
| Per-claim and aggregate limits | Meet your client contracts, with room for a bad year |
| Retroactive date | The same as, or earlier than, your current policy’s |
| Defense costs | Inside or outside the limit |
| Deductible or retention | The amount, and whether it applies to defense |
| Exclusions | Anything excluded on one quote that the other covers |
Your claims record and how you work
The NAIC says a high past-claims history can increase insurance costs, and that’s as true here as anywhere, so have your loss runs ready when you shop and be open about any claims or demands you’ve received. A client’s angry letter that never became a lawsuit can still matter, since many claims-made policies ask you to report circumstances that might lead to a claim, and when you switch insurers, a circumstance you knew about and didn’t disclose on the application can fall outside the new policy, even with a matching retroactive date.
How you run engagements matters too, though it’s harder to see on a quote. The NAIC notes that businesses with solid, documented practices may be assessed as lower risk, and in professional work that usually means written agreements that define the scope of each job, clear records of what the client approved, and a habit of putting changes in writing. Those habits make claims less likely, and they make the ones that do arrive easier to defend.
With Corgi, you can get a professional liability quote online in about five minutes, and underwriters answer your questions, not a broker. Your certificate of insurance is available the day you buy, and you can send it to a client from your account.
See what professional liability costs for your business
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Frequently asked questions
Why do professional liability prices vary so much between professions?
Because the size and frequency of claims vary so much, and a mistake by an architect or an accountant can cost a client far more than a mistake by many other service businesses, and the rate for each profession reflects that, before your revenue, contracts and choices are counted.
Does a bigger client raise my professional liability premium?
It can. Insurers look at the size of your clients and contracts because a mistake on a larger job can produce a larger claim. A big client may also require a higher limit in its contract, which adds to the price on its own.
What is a retroactive date, and why does it affect price?
It’s the earliest date of work a claims-made policy will cover. A policy with an older retroactive date covers more of your past work, so it has more potential claims to pay for. Keep the same date when you renew or switch, or past work may lose coverage.
Are defense costs included in my professional liability limit?
It depends on the policy. On many professional liability policies, defense costs count against the limit, so they reduce what’s left for a settlement, while others pay defense in addition to the limit. Check the defense provision or ask your insurer.
