The first time someone hands you a five-year loss run, the instinct is to add up the dollars at the bottom and form a quick verdict. Big number bad, small number good. That instinct is wrong about half the time, and learning why is the difference between an account manager who chases declinations and one who anticipates them.
A loss run is not a verdict. It's a chronology. Read it like a timeline and you'll see what underwriters see: not a sum, but a shape.
What underwriters actually look for
When I was on the underwriting desk, the first thing my eyes went to wasn't the total paid figure. It was the count of claims and the years they fell in. A book with one $80,000 claim looks expensive on paper. A book with eight $10,000 claims looks the same in dollars but costs more to insure, because frequency tells the carrier something the dollars don't: this insured has a system that produces claims.
Severity is buyable. A bad year happens. Frequency is structural. It points to operational habits — training gaps, unsafe job sites, undocumented procedures, managers who don't enforce protocols. Carriers price for the structural risk, not the bad year.
So the first read is always: how many claims, in how many years, and what kind?
The reserved column is louder than the paid column
Loss runs typically show four columns that matter: incurred, paid, reserved, and status. Newer account managers anchor on paid because it feels final. Underwriters anchor on incurred and reserved because those are the carrier's expectation.
An open claim with $50,000 reserved is a $50,000 problem on paper, even if zero has been paid yet. The reserve is the carrier's best guess at what they'll eventually owe. When you're preparing a renewal submission, every open reserve is a number the underwriter will price into the renewal premium. Reading the reserved column tells you which claims to chase: ask the carrier for status, push for closure where possible, document any subrogation in process.
A closed claim is a story with an ending. An open claim is a number the underwriter has to guess at, and underwriters round up.
What loss runs don't tell you
Three things a loss run will not surface, and you have to ask:
- What changed. Loss runs show what happened, not what's been done about it. Two truck rollovers in 2023 look like a fleet problem until you learn the insured fired both drivers, installed dashcams, and contracted with a defensive-driving program. That story belongs in your submission cover letter, not on the loss run.
- Why the claim happened. A $30,000 slip-and-fall at a restaurant might be a freak accident or a recurring pattern. The loss run says "GL claim." The general manager will tell you the floor was being mopped during a lunch rush — and that they've since changed wet-floor signage policy.
- The shape of recovery. Subrogation, deductibles, salvage, and recoveries don't always show cleanly. A $100,000 paid claim might have $40,000 in subrogated recovery the underwriter won't see unless you flag it.
The five-year rule, and why three is often enough
Most carriers ask for five years of loss runs because that's the actuarial window where patterns become visible. But for a quick read, three is enough to spot trouble. If a book has zero claims in years one and two, then four claims in year three, something changed in year three. Find out what. New location? New crew? New type of work? The narrative explanation often wins the underwriter over more than the numbers do.
What this means for an account manager
You don't need to underwrite. You need to read like an underwriter would, so you can frame the submission before the underwriter forms their own frame. Three habits I've found valuable:
- Read the loss run before you read the application. Let the data shape your questions for the insured, not the other way around.
- Write a one-paragraph claims narrative at the top of every submission. Underwriters skim. A clear paragraph that says "two claims in 2023, both since closed, both attributable to a since-departed driver, with documented training program now in place" can change the trajectory of a renewal.
- Track open reserves like you'd track unpaid invoices. Push for closure or status updates ninety days before renewal. The cleaner the loss run on submission day, the better the quote.
None of this is glamorous. None of it makes the LinkedIn highlight reel. But it's the difference between an account manager who renewals approve themselves around, and one who has to chase quotes for a week. The loss run is a chronology, not a verdict — and the people who read it that way write the better books.