Workers’ comp insurance in PA runs most small employers anywhere from a couple hundred dollars a year to several thousand, and the swing comes down to three things: what your employees do, how much you pay them, and your claims record. The base loss costs set by the Pennsylvania Compensation Rating Bureau start as low as $0.06 per $100 of payroll for clerical staff and climb past $5.55 per $100 for tree work, with every trade in between falling somewhere on that scale.1Pennsylvania Compensation Rating Bureau. Pennsylvania Workers Compensation Basic Manual Insurers add their own expenses and profit on top of those loss costs, so the final quote varies carrier to carrier even for the same business.
The Formula Behind Your Premium
Every workers’ comp premium in Pennsylvania starts from the same calculation:
Premium = (Payroll ÷ 100) × Class Code Rate × Experience Modification Factor
Take a restaurant with $200,000 in annual payroll. General restaurant operations fall under Code 975 at a $1.78 loss cost rate. If the business has an experience modifier of 0.90, the math works out to ($200,000 ÷ 100) × $1.78 × 0.90 = $3,204 in base premium before the insurer’s markup. Run the same $200,000 payroll through a clerical office at $0.06 per $100 and the base premium drops to $108. Same payroll, same state, very different number — because the classification code does most of the work.
On top of that base figure, expect a few additions on the final policy. Smaller accounts hit a minimum premium that covers the insurer’s administrative overhead. A Terrorism Risk Insurance Act surcharge is standard. A waiver of subrogation endorsement, often required when you subcontract for larger companies, adds roughly two to three percent of the relevant premium.
Classification Codes Drive the Rate
Pennsylvania assigns every employer a four-digit classification code based on what employees actually do day to day, not the company name or general industry label.2Pennsylvania Compensation Rating Bureau. Classification Plan Each code carries a loss cost rate expressed per $100 of payroll. These PCRB figures from the current manual show the spread:1Pennsylvania Compensation Rating Bureau. Pennsylvania Workers Compensation Basic Manual
- Clerical office employees (Code 953): $0.06 per $100 of payroll
- Landscape contractors (Code 012): $1.27 per $100 of payroll
- Fast-food restaurants (Code 897): $1.47 per $100 of payroll
- Restaurants, general (Code 975): $1.78 per $100 of payroll
- Excavation (Code 609): $3.51 per $100 of payroll
- Concrete construction (Code 654): $3.90 per $100 of payroll
- Residential carpentry (Code 652): $5.13 per $100 of payroll
- Tree pruning and spraying (Code 005): $5.55 per $100 of payroll
These are loss costs, not final rates. Every insurer builds on the same base, then adds its own expenses and profit margin. That is why quotes from two carriers for the same business can come back meaningfully different, and why shopping around is worth the effort.
Getting the code right also matters. If your office staff is lumped under the same high-risk code as your field crew, you are paying the field rate on their wages. A business that has added clerical roles since its policy was first written should ask its agent or the PCRB to verify that payroll is being split correctly across codes.
How Payroll Feeds the Price
Payroll is the multiplier in the formula, so it moves the premium one-for-one. A quote is based on your estimated payroll for the coming year, but it is not the final number. Every policy goes through an annual audit after the period ends, in which the insurer reviews your tax filings, general ledger, payroll journals, and subcontractor payments against the estimate.
If actual payroll came in higher, you owe additional premium. If it came in lower, you get a refund. Overestimating ties up cash you could use elsewhere; underestimating produces a bill you were not planning for. Realistic projections, updated mid-term when your workforce changes meaningfully, keep that audit from catching you off guard.
Subcontractors are a frequent audit surprise. If you paid a subcontractor who cannot produce a certificate of insurance showing their own workers’ comp coverage, your insurer charges premium on those payments as if the subcontractor were your employee. Collecting certificates before anyone starts work prevents that charge.
How Claims History Changes the Number
Once your business has been operating long enough to generate meaningful claims data, the PCRB calculates an Experience Modification Factor — the “Ex-Mod” — that adjusts your premium up or down based on your actual safety record.3Pennsylvania Compensation Rating Bureau. Organization A factor of 1.0 means your claims line up with the average for your industry. Below 1.0 is a discount. Above 1.0 is a surcharge.
The calculation uses three years of your losses against the expected losses for your classification codes and payroll size. Fewer and cheaper claims pull the number down; frequent or expensive ones push it up. The PCRB requires at least $5,000 in developed premium during the experience period before it assigns a factor, so very small employers pay the base rate without an experience adjustment until they cross that threshold.4Pennsylvania Compensation Rating Bureau. Experience Rating Plan – Frequently Asked Questions
Because the Ex-Mod multiplies the whole premium, improvements compound. Safety training, enforced protective equipment rules, and a return-to-work program that gets injured employees back on modified duty quickly all reduce both claim frequency and severity. The three-year window means changes take time to show up in the number, but once they do, the savings repeat year after year.
Rates Have Been Falling
Pennsylvania workers’ comp costs have been trending down. In January 2024, the Insurance Commissioner approved a PCRB filing that cut overall loss costs by 7.88 percent for policies effective on or after April 1, 2024.5Pennsylvania Compensation Rating Bureau. PA Insurance Commissioner Approves PCRB Annual Loss Cost Filing A further 8.67 percent reduction was approved for policies effective April 1, 2025, continuing a multi-year pattern.
Loss cost decreases flow through to most employers because every insurer builds on that same base. The timing depends on your renewal date, and each carrier’s expense factor shapes how much of the drop actually reaches your invoice, so individual results vary.
Ways to Lower What You Pay
Start a Certified Safety Committee
Pennsylvania grants a direct five percent premium discount to employers who establish and maintain a certified workplace safety committee.6Commonwealth of Pennsylvania. Certified Safety Committee Information The committee needs at least two employer representatives and two employee representatives, must meet monthly, and must have been operating for at least six consecutive months before you apply. All members complete training in committee operations, hazard inspection, and accident investigation, and the training renews annually. The application goes to the Workers’ Compensation Certification Unit between 90 and 30 days before your policy renewal date.
Verify Your Class Codes
If your operations have shifted or you have added roles that differ from the original classifications, you may be paying a rate that no longer matches your risk. A review with your agent or the PCRB can catch errors. Office staff coded under a field classification is the most common and most expensive version of this mistake.
Shop More Than One Carrier
Because every insurer starts from the same PCRB loss costs and adds its own markup, two quotes for the same business will not match. Pennsylvania has over 300 private insurers authorized to write workers’ comp, which gives you real room to compare.7Commonwealth of Pennsylvania. Purchasing Workers’ Compensation Insurance
Where to Buy Coverage in Pennsylvania
Three channels meet the state’s coverage requirement:7Commonwealth of Pennsylvania. Purchasing Workers’ Compensation Insurance
- Private insurance carriers. Over 300 insurers write workers’ comp in Pennsylvania, and shopping among them is the usual route to competitive pricing.
- The State Workers’ Insurance Fund (SWIF), a state-run fund within the Department of Labor and Industry that is required by law to write coverage for any eligible employer. SWIF is the backstop for new businesses and for employers who have trouble getting coverage from private carriers because of claims history or high-risk classifications.8Commonwealth of Pennsylvania. State Workers’ Insurance Fund Home
- Self-insurance. Larger employers can apply to pay claims directly rather than buy a policy. Applicants must have been in business for at least three consecutive years, submit audited financial statements, post security as a letter of credit, surety bond, or trust fund, and maintain an adequate safety program. The initial application fee is $500 per affiliate or subsidiary.
What to Have Ready for a Quote
Accurate numbers in produce accurate numbers out. Before you call a carrier, an agent, or SWIF, gather:7Commonwealth of Pennsylvania. Purchasing Workers’ Compensation Insurance
- Your Federal Employer Identification Number (FEIN).
- Payroll estimates broken out by job duty, since employees doing different work fall under different codes. Lumping payroll together produces an inaccurate quote.
- A loss run report covering three to five years of claims. Your current insurer must provide this on request.
- Employee count and projected annual wages.
- A clear description of what your employees actually do, which the insurer uses to assign classification codes.
One boundary worth naming: every Pennsylvania employer with one or more workers must carry coverage, whether those workers are full-time, part-time, or family. A narrow set of exemptions exists for federal workers, certain agricultural and domestic workers, casual labor, and some licensed real estate and insurance agents, among others, but if even one employee falls outside those categories, coverage is mandatory. Pricing the policy is the right question for almost every employer in the state.