Your PEO sends you workers’ comp reports quarterly, maybe annually. Most business owners glance at the premium number, maybe wince, then file it away. But buried in those reports is a story about where your money actually goes—and whether your PEO relationship is helping or hurting your insurance costs over time.
Loss trend analysis sounds technical, but it’s really just tracking whether claims are getting better, worse, or staying flat, and understanding what’s driving the pattern.
This matters because PEOs pool your workers’ comp risk with other companies. If you’re a good operator running a safe workplace, you want to know whether you’re subsidizing sloppy companies in the pool—or benefiting from the arrangement.
This guide walks you through how to pull the right data, spot meaningful patterns, and have informed conversations with your PEO about what the trends actually mean for your renewal pricing. No actuarial degree required.
Step 1: Gather Your Claims History and Loss Run Reports
Start by requesting loss runs from your PEO covering at least the last three to five years. Most PEOs will provide these within 30 days of asking—it’s your data, and you’re entitled to it. If they drag their feet or act like this is an unusual request, that’s worth noting.
Loss runs are detailed reports showing every workers’ comp claim filed under your policy. Each entry typically includes the claim date, injury description, initial reserve amount, paid amounts to date, and current claim status (open or closed).
The key data points you need are claim counts, incurred losses (paid plus reserves), paid losses (actual money out the door), outstanding reserves (estimated future costs), and claim status. These five elements form the foundation of any meaningful trend analysis.
Here’s where it gets tricky: understand the difference between your company-specific data versus pool-wide data the PEO may share. Your loss runs should show claims specific to your employees. Some PEOs also provide pool performance summaries, which can be useful for context but shouldn’t be confused with your actual experience.
If your PEO operates under a master policy arrangement, your claims are technically part of a larger pool. But you still need to see your individual company’s claim history broken out separately. Without this, you’re flying completely blind.
Flag any gaps or inconsistencies before you start analyzing. Missing quarters? Claims that appear then disappear? Reserves that jump around without explanation? Incomplete data leads to wrong conclusions, so get clarity upfront.
Ask your PEO contact to walk through the loss run format if anything looks confusing. The column headers aren’t always intuitive, and different carriers use different terminology for the same concepts. Understanding historical loss analysis methodology helps you interpret what you’re seeing.
Once you have clean data spanning multiple years, you’re ready to start spotting patterns.
Step 2: Calculate Your Loss Ratios Year Over Year
Loss ratio is the simplest, most telling metric in workers’ comp analysis. It’s just incurred losses divided by earned premium for each policy period.
If you paid $100,000 in workers’ comp premium and incurred $60,000 in losses (claims costs), your loss ratio is 60%. That’s the percentage of premium dollars going toward actual claims versus administrative costs, profit margins, and reserves.
Track how this ratio changes annually. A stable loss ratio around 50-70% generally signals a predictable, well-managed risk. Improving ratios (trending downward) suggest your safety programs are working or you’ve made operational changes that reduced claims. Deteriorating ratios (trending upward) mean something’s going wrong.
Compare your company’s loss ratio against industry benchmarks for your specific NCCI class codes. A 60% loss ratio in office work is very different from a 60% loss ratio in roofing. Context matters.
Your PEO should be able to provide industry benchmarks, or you can find them through NCCI’s published data. Don’t compare yourself to completely different industries—it’s meaningless.
Here’s what different loss ratios actually signal: A loss ratio consistently below 50% means you’re probably overpaying for coverage relative to your actual risk. You’re a good account, and you should be pushing for better pricing.
A loss ratio between 50-70% is typical for well-run operations. You’re paying a reasonable premium for the risk you present. Understanding loss ratio management strategies can help you maintain this performance.
A loss ratio above 100% means claims are exceeding premium. You’re technically unprofitable from an underwriting perspective, and you’ll see that reflected in renewal pricing—or non-renewal altogether.
The trend direction matters more than any single year. One bad year with a catastrophic claim can spike your ratio. But if you’re seeing steady increases year over year, that’s a pattern worth investigating.
Keep a simple spreadsheet with columns for policy year, earned premium, incurred losses, and calculated loss ratio. Chart it visually. Patterns jump out faster when you can see the line moving.
Step 3: Break Down Claims by Frequency and Severity
Loss ratio tells you the overall picture. Frequency and severity tell you what’s actually driving it.
Frequency is how often claims happen. Severity is how expensive each claim is. These are fundamentally different problems requiring different solutions.
Calculate frequency by dividing total claim count by a normalized metric—usually claims per 100 employees or claims per million hours worked. This accounts for company growth. If you had 10 claims with 50 employees and 15 claims with 100 employees, your frequency actually improved even though claim count went up.
Calculate average claim cost per year to spot severity trends. Total incurred losses divided by claim count gives you average severity. If this number is climbing, your claims are getting more expensive even if they’re not happening more often.
Here’s why this distinction matters: High frequency with low severity usually points to workplace safety issues, inadequate training, or poor hiring practices. You’re having lots of small incidents—slips, strains, minor cuts. The fix involves better safety protocols, employee training, and incident prevention.
Low frequency with high severity suggests you’ve got the basics down, but when something goes wrong, it goes really wrong. Maybe you have proper procedures but employees aren’t following them in high-risk situations. Or you’ve got one particularly dangerous operation that needs specific attention.
Track both metrics over the same 3-5 year period. Plot them on separate lines. You’ll often see inverse relationships—frequency drops while severity climbs, or vice versa. Detailed claims frequency analysis can reveal patterns you’d otherwise miss.
If both frequency and severity are climbing simultaneously, you’ve got a serious problem that needs immediate operational attention. This pattern rarely fixes itself.
Map claim frequency against headcount and hours worked to normalize the data properly. A construction company ramping up project volume will naturally see more claims in absolute numbers, but frequency per hour worked might actually be improving.
The goal is identifying which trend is driving your overall loss picture. Then you know where to focus your efforts.
Step 4: Examine Reserve Development and Claim Closure Patterns
Reserves are educated guesses about how much open claims will ultimately cost. They’re not actual expenses yet—they’re estimates that can change dramatically as claims develop.
Track how initial reserve estimates compare to final claim costs once claims close. If reserves consistently come in lower than final costs, that’s called adverse development. It means claims are costing more than initially expected.
Consistent underestimation is a red flag. It suggests either your PEO’s claims adjusters are too optimistic, or something about your claims is routinely more complicated than it appears upfront. Understanding how to review your PEO’s reserve development helps you spot these issues early.
Look at claim closure timelines. Are claims resolving faster or dragging out longer over time? Faster closure generally means lower ultimate costs and better claims management. Longer durations often signal disputes, litigation, or medical complications.
Calculate average days to closure for claims in each policy year. If this number is trending upward, ask your PEO why. Sometimes it’s external factors like state regulatory changes. Sometimes it’s poor claims handling.
Understand how open reserves on old claims can inflate your loss trend numbers artificially. A claim from three years ago that’s still open with a $50,000 reserve affects your incurred loss total even though nothing new happened this year.
Ask your PEO about their reserving philosophy. Some carriers reserve conservatively (high initial estimates that often get reduced). Others reserve aggressively (low initial estimates that frequently increase). Neither is inherently wrong, but you need to know which approach they use to interpret your data correctly.
Conservative reserving makes your loss ratios look worse initially but improves over time as reserves are released. Aggressive reserving makes early years look better but can lead to nasty surprises when reserves develop upward.
Pay special attention to claims that have been open for more than two years. These often represent the most expensive, complicated cases—and they’re the ones most likely to blow up your loss trends if not managed properly.
Step 5: Identify Root Causes Behind Your Trend Patterns
Numbers tell you what’s happening. Context tells you why.
Cross-reference your claims data with operational changes. Did you open a new location the same year claim frequency spiked? Did you expand into a new service line with different risk characteristics? Did you experience rapid workforce growth that outpaced your training capacity?
Look for clustering patterns in your loss runs. Same injury types appearing repeatedly? Same departments showing up over and over? Claims concentrated in specific time periods or seasons?
If you’re seeing five back strain claims from the warehouse in Q4 every year, that’s not random—that’s a pattern tied to holiday volume increases and probably inadequate staffing or training during peak periods.
Separate what you control from external factors. You control safety programs, hiring practices, training quality, equipment maintenance, and workplace culture. You don’t control medical cost inflation, state regulatory changes, or litigation trends in your jurisdiction. Implementing strong loss control programs addresses the factors within your control.
If your severity is climbing but frequency is flat, and you haven’t changed operations significantly, medical cost inflation might be the primary driver. That’s worth knowing because it changes how you approach the problem.
Document your findings in plain language. Not for your files—for conversations with your PEO. “We had three falls from height in 2025, all at the Springfield location, all within the first 90 days of employment” is actionable information. “Claims went up” is not.
Talk to your front-line managers and safety personnel. They often know exactly why certain claims happened, but nobody asked them. The warehouse supervisor might tell you the new forklifts have a visibility issue nobody reported. The construction foreman might mention rushed schedules leading to shortcuts.
The goal isn’t assigning blame—it’s understanding cause and effect well enough to fix the underlying issues before renewal season arrives.
Step 6: Use Your Analysis in PEO Renewal Negotiations
Here’s where your homework pays off.
Present your trend analysis to your PEO during renewal discussions. Don’t just accept their pricing proposal—show them you understand your risk profile. This immediately changes the conversation from “here’s your renewal” to “let’s discuss what these numbers actually mean.”
If your trends are improving, push for premium credits or better rating treatment. You’ve got data proving you’re a better risk than you were three years ago. That should translate to better pricing, not automatic rate increases. Running a thorough renewal risk analysis strengthens your negotiating position.
If trends are worsening, get ahead of it. Show you’ve identified root causes and implemented specific mitigation plans. “Yes, severity increased 15% last year, but we’ve since implemented mandatory safety training for new hires and upgraded our ladder inventory. Here’s the documentation.”
Ask how your trends compare to the PEO’s overall pool. You deserve to know if you’re a better or worse risk than average. If you’re significantly better, you should benefit from that in pricing. If you’re worse, you need to understand whether the pool arrangement still makes sense for you.
Some PEOs will share pool-wide loss ratio data. Others won’t. But asking the question signals you’re paying attention and expect transparency.
Challenge unexplained premium increases. If your loss ratio dropped from 75% to 55% but your premium still increased 12%, something doesn’t add up. Make them explain the math. Sometimes it’s legitimate—rate changes, payroll growth, class code shifts. Sometimes it’s not. Understanding how PEOs calculate premiums helps you identify discrepancies.
Use your analysis to evaluate whether your PEO arrangement still makes sense. If you’ve consistently run a 40% loss ratio for three years in a PEO pool, you might be better off with a standalone policy where you capture more of the benefit from your good performance.
The point isn’t to become adversarial—it’s to have informed, data-driven conversations instead of just accepting whatever renewal proposal lands on your desk.
Putting It All Together
Loss trend analysis isn’t about becoming an actuary. It’s about not flying blind on one of your largest insurance expenses.
When you understand whether claims are increasing or decreasing, what’s driving the pattern, and how reserves are developing, you can push back on unexplained premium increases and make informed decisions about whether your PEO arrangement still makes sense.
Run this analysis annually before renewal season. Keep a simple spreadsheet tracking loss ratios, claim counts, average severity, and frequency metrics. Document any operational changes that might explain shifts in the data.
The goal isn’t perfection—it’s having enough information to ask smart questions and recognize when the numbers don’t add up.
Most business owners never look past the premium invoice. That’s exactly what some PEOs count on. When you show up with actual analysis of your loss trends, you’re no longer the easy renewal. You’re the informed buyer who expects value for their spend.
And here’s the thing: good PEOs appreciate clients who understand their data. It makes their job easier when they can have substantive conversations about risk management instead of just defending price increases.
Before you sign that PEO renewal, make sure you’re not leaving money on the table. Many businesses unknowingly overpay because of bundled fees, hidden administrative markups, and contracts designed to limit flexibility. We give you a clear, side-by-side breakdown of pricing, services, and contract terms—so you can see exactly what you’re paying for and choose the option that truly fits your business.
