Most business owners know their employees cost more than just salary. But few can actually put a precise number on it. Labor burden is the gap between what you pay someone and what that person actually costs you — and it adds up faster than most people expect.
The components are familiar enough: employer-side payroll taxes, workers’ comp premiums, health insurance contributions, unemployment insurance, 401(k) match, and a layer of administrative costs that rarely show up cleanly on any single report. When a PEO enters the picture, some of those costs shift, shrink, or get restructured. Others don’t move at all.
The problem is that most PEO sales reps will hand you a glossy savings estimate without showing their math. You get a projected annual savings figure and a compelling slide deck, but no real way to verify whether the numbers hold up against your actual situation. And most business owners don’t have a structured method to pressure-test those claims before signing anything.
This guide walks you through building your own labor burden reduction calculator. It’s a spreadsheet-level exercise — nothing proprietary required — that lets you compare your current fully-loaded labor costs against what they’d actually look like under a PEO arrangement. You’ll gather your real numbers, map them into the right categories, model the PEO scenario using actual quotes, and come out with a clear picture of whether the math works in your favor.
A few things this guide won’t do: it won’t tell you PEOs always save money (they don’t), it won’t hand you a magic formula, and it won’t substitute for getting real quotes from real providers. What it will do is give you a framework to evaluate those quotes honestly.
Whether the calculator shows meaningful savings or reveals that a PEO isn’t worth it for your situation — both outcomes are useful. The point is to know before you sign.
Step 1: Map Out Every Component of Your Current Labor Burden
Before you can calculate a reduction, you need a complete and accurate picture of what you’re spending today. This is where most business owners underestimate the exercise. It’s not just payroll taxes. It’s everything that comes out of the business because you employ people.
Start with the obvious categories and work toward the less obvious ones:
Employer-side FICA: Social Security and Medicare taxes on the employer’s side. These are fixed by statute and won’t change under a PEO arrangement. Include them in your baseline, but flag them as non-variable.
FUTA and SUTA: Federal and state unemployment taxes. FUTA is relatively small and fixed. SUTA varies by state and by your company’s experience rating — meaning your claims history directly affects your rate. This one can move under a PEO.
Workers’ compensation premiums: Pull your actual premium invoices for the last 12 months. Note your experience modification rate (mod rate) if your state uses one. This is often the single largest variable cost in the burden stack, and it’s one of the areas where PEOs can have real pricing leverage. If you need help understanding how mod rates work in a PEO context, a PEO mod rate forecasting model can provide useful context.
Health, dental, and vision employer contributions: What does the company actually contribute per employee per month across each plan tier? Pull this from your benefits invoices, not from memory. Include what you pay for employee-only coverage, employee-plus-spouse, and family tiers separately if your enrollment mix is uneven.
401(k) match and retirement contributions: If you offer a match, calculate the actual dollar amount contributed over the last 12 months. This typically won’t change under a PEO, but it belongs in your baseline.
Short-term and long-term disability premiums: If employer-paid, pull the actual premiums. If voluntary and employee-paid, exclude them from the burden calculation.
HR and administrative labor: This one requires honest estimation. How much of your HR coordinator’s time, your office manager’s time, or your own time goes toward compliance, benefits administration, payroll processing, and onboarding? Assign a dollar value based on salary and time allocation. It won’t be perfect, but a reasonable estimate is better than ignoring it entirely.
Payroll processing fees: What are you paying your payroll vendor per month? Per run? Per year-end filing?
Benefits broker fees or consulting fees: If you pay a broker for benefits placement or renewal support, include that cost.
Once you’ve gathered all of this from your actual payroll reports, insurance invoices, and general ledger — not from estimates or industry benchmarks — add it up. Then divide total burden costs by total gross wages. That percentage is your current burden rate. It becomes your baseline multiplier and the number you’ll compare against at the end of this exercise. For a deeper walkthrough of this calculation, see our guide on how to calculate your true labor burden with and without a PEO.
The discipline here is using real numbers. Industry averages are fine for orientation, but they won’t tell you whether a PEO makes sense for your specific payroll, your specific workers’ comp history, or your specific health plan enrollment mix.
Step 2: Separate What a PEO Can Actually Change From What It Can’t
This is the step that most PEO savings presentations skip entirely — and it’s where inflated projections come from.
Not every burden component is affected by a PEO arrangement. Employer FICA is set by federal law. It doesn’t matter whether you run payroll directly or through a PEO — you’re paying the same Social Security and Medicare taxes either way. Same with your 401(k) match, if you maintain the same plan design. These costs belong in your model as baseline, but they’re not part of your reduction analysis.
Create two columns in your calculator spreadsheet: Fixed / Unchanged and Variable / PEO-Affected. Move each burden component into the right column. Only the second column matters for calculating potential savings.
Here’s what typically belongs in the PEO-Affected column:
Workers’ compensation: PEOs carry their own master workers’ comp policies and pool risk across their entire client base. If your standalone mod rate is elevated due to claims history, a PEO’s pooled rate may be meaningfully lower. If your mod rate is already favorable, the advantage shrinks or disappears. Understanding how PEOs cut workers’ comp costs will help you evaluate whether this applies to your situation.
Health insurance: Small and mid-sized employers buying coverage in the small group market often pay more per employee than large employers. PEOs access coverage through master plans that aggregate employees across hundreds of client companies, which can create pricing advantages. Whether that advantage materializes for you depends on your workforce demographics, current carrier, and plan design.
SUTA: In most states, when employees are co-employed through a PEO, they’re reported under the PEO’s federal employer identification number. This means the PEO’s SUTA rate applies rather than yours. If the PEO has a lower rate, that’s a savings. If their rate is higher — or if your state doesn’t allow SUTA rate portability — this advantage disappears.
Administrative labor and vendor fees: If a PEO absorbs payroll processing, benefits administration, and compliance work that currently requires dedicated staff time or outside vendors, that’s a real cost reduction — but only if you actually reallocate or reduce that headcount or spending. A PEO doesn’t automatically save you money on HR labor unless you make a corresponding change. For a structured way to quantify these savings, review these cost accounting methods for comparing internal HR vs PEO expenses.
The common mistake is netting the PEO’s total admin fee savings against only one cost category. The PEO fee is a new line item that offsets multiple savings across several categories. You have to look at the net picture across everything, not just the most favorable individual line.
Step 3: Gather Actual PEO Pricing Into Your Model
You can’t run a real comparison without real numbers from the PEO side. This step is where the exercise becomes concrete — and where a lot of evaluations fall apart because the quotes aren’t structured clearly enough to plug into a model.
When you request quotes from PEO providers, ask specifically for itemized pricing. Not a bundled per-employee-per-month number. Not a percentage-of-payroll figure with a footnote. You need the same categories you mapped in Step 1 broken out separately so you can compare line by line.
Ask each PEO to provide:
Workers’ comp rate by classification code: What rate will they apply to each job classification in your workforce? Compare this directly to your current premium per $100 of payroll in the same codes. Our guide on how to calculate PEO workers’ comp premiums walks through this comparison step by step.
Health plan premiums by tier: What are the employer and employee contributions at each coverage tier (employee-only, employee-plus-one, family) for each plan option? Get this in the same format as your current invoices so the comparison is direct.
SUTA rate: What rate will apply to your employees under the PEO’s FEIN? Is that rate guaranteed for the contract term or subject to change?
Admin or service fee: What is the explicit fee for the PEO’s services, expressed both as a flat dollar amount and as a percentage of payroll? This is the cost of the PEO itself and it must be a visible line item in your model.
PEOs use two main pricing structures: percentage-of-payroll and flat per-employee-per-month (PEPM). If you’re comparing quotes from providers using different models, normalize them into the same format. Convert PEPM to annual total by multiplying by headcount and 12. Convert percentage-of-payroll to annual total by applying the rate to your projected gross wages. Now they’re comparable. For a detailed breakdown of what these fees actually look like, see our analysis of how much a PEO costs in practice.
One thing worth asking directly: which costs are passed through at actual cost, and which carry a markup? Some PEOs pass workers’ comp and health premiums through at cost and charge a clean admin fee on top. Others bundle margin into the insurance line items and show a lower admin fee. Neither model is inherently wrong, but you need to know which you’re looking at. A PEO that shows a very low admin fee but marks up insurance premiums by a meaningful amount may be more expensive in total than one with a higher visible fee and clean pass-throughs.
If a provider won’t give you itemized pricing at this level of detail, that tells you something worth knowing before you sign anything.
Step 4: Run the Side-by-Side Comparison and Calculate Net Reduction
Now you have two columns of real numbers: your current burden by category, and the PEO’s cost for the same categories. This is where the calculator does its actual work.
For each line item in your PEO-Affected column, subtract the PEO cost from your current cost. Some lines will show savings. Others may show increases. Both outcomes are valid and important — don’t cherry-pick the favorable ones.
A few things to watch for as you work through the comparison:
Workers’ comp is often the largest swing factor. If your mod rate is above 1.0, the PEO’s pooled rate may produce meaningful savings. If your mod rate is already at or below 1.0, the advantage narrows considerably. Run the math at your actual classification codes and payroll volumes, not at a blended average.
Health insurance comparisons require attention to plan equivalency. A PEO plan that costs less per employee per month may also have a higher deductible or narrower network than your current plan. If you’re comparing plans with different benefit structures, you’re not comparing apples to apples. Note the differences and decide whether they’re acceptable before treating the cost difference as pure savings. Understanding how these changes flow through your books is important — our guide on PEO impact on insurance expense reporting covers what shifts on your financial statements.
Now add the PEO admin or service fee as a new line item on the PEO side. This cost doesn’t exist in your current model, which means it needs to be added back explicitly. It’s the fee you’re paying for the PEO’s services, and it offsets every line of savings above it.
Sum all line-item deltas: current cost minus PEO cost for each affected category, minus the PEO service fee. The result is your net annual labor burden change. Positive means you’re saving money. Negative means the PEO arrangement costs more than your current setup, even after accounting for all the line-item savings.
Express this result two ways. First, as a total annual dollar amount — that’s the most intuitive figure for business decisions. Second, recalculate your burden rate under the PEO scenario (total burden including PEO fee divided by gross wages) and compare it to the baseline rate you calculated in Step 1. The difference in percentage points is your actual burden rate reduction, if any. This second format is useful because it scales with payroll growth and lets you compare meaningfully across headcount scenarios. For a broader view of how these numbers affect your financials, see our analysis of PEO impact on operating expenses.
Step 5: Stress-Test Your Numbers With Realistic Scenarios
A single-point estimate isn’t enough to make a multi-year commitment. The comparison you built in Step 4 reflects one moment in time under favorable assumptions. Before you treat it as a decision, run it through a few scenarios that test how robust the savings actually are.
Worst case scenario: What happens if your workers’ comp claims increase under the PEO arrangement and they adjust your rate at renewal? What if health plan utilization in your employee group triggers a premium increase at year two? PEO health plans are often experience-rated at the group level after the first year, which means a bad claims year can erode the pricing advantage you saw in year one. Model what the comparison looks like if those costs increase by a meaningful amount at renewal. Running a workers’ comp renewal risk analysis before your contract renews can help you anticipate these shifts.
Best case scenario: What if the PEO’s safety programs actually drive down your effective workers’ comp costs over time? What if you’re able to eliminate or reduce an HR coordinator role because the PEO absorbs that administrative workload? Model the upside too — but be honest about whether those outcomes are realistic for your specific situation, not just possible in theory.
Year-over-year trend analysis: A PEO that produces savings in year one may not produce savings by year three if they have aggressive renewal escalators on their service fee while your standalone costs would have remained flat. Ask each PEO about their historical renewal increase patterns and build those trends into a simple three-year projection. The year-one comparison is just the starting point.
Switching costs and implementation friction: These are one-time costs that belong in your model even though they don’t recur. Payroll system migration, benefits re-enrollment, employee communication overhead, and the time your team spends managing the transition all have real costs. If the net annual savings from the PEO is modest, a significant implementation burden can push the breakeven point well into year two or beyond. Our PEO transition guide covers what to expect during the switch.
The goal of stress-testing isn’t to talk yourself out of a good deal. It’s to make sure the deal holds up under realistic variation, not just under the assumptions that make the PEO’s pitch look most favorable.
Step 6: Decide Whether the Reduction Justifies the Tradeoff
Your calculator now shows a net number. Here’s how to think about what that number actually means for your decision.
A small labor burden reduction on a modest payroll may not justify the operational tradeoffs of co-employment. Co-employment means the PEO becomes the employer of record for your workforce. That affects how you handle HR decisions, benefits plan design, payroll customization, and your direct relationship with carriers and vendors. For some businesses, those tradeoffs are acceptable. For others, they’re genuinely disruptive.
If the calculator shows marginal savings — or no savings at all — that’s a valid and useful outcome. It doesn’t mean PEOs are bad. It means this particular arrangement, at this particular price, doesn’t make financial sense for your situation. You have a few options from there: negotiate harder on the PEO’s service fee or insurance pricing, explore different PEO providers whose rate structures may be more favorable for your workforce profile, or stay in-house and focus on reducing burden costs through other means.
If the calculator shows meaningful savings, use it as a negotiating tool. Show up to the PEO conversation with your own math instead of reacting to theirs. Providers respond differently when you can point to specific line items and ask why their quote doesn’t match what you’d expect based on your current costs. It shifts the dynamic from a sales conversation to a business negotiation.
One thing worth keeping in mind: the calculator captures financial impact, but not everything that matters in a PEO evaluation. Compliance risk reduction, access to better benefits that improve retention, and the operational bandwidth you recover by offloading HR administration all have value that’s harder to quantify. The calculator tells you whether the math works. The rest of the evaluation tells you whether the fit is right.
If you’re at the stage of comparing specific providers side by side, a structured comparison of top PEO providers will help you make a more complete decision than any single calculator can provide.
Putting It All Together
Your labor burden reduction calculator doesn’t need to be a sophisticated tool. A well-organized spreadsheet with real numbers from your payroll reports, insurance invoices, and PEO quotes will tell you more than any provider’s marketing deck.
The steps are straightforward: map your full current burden across every cost category, isolate what a PEO can actually change versus what stays fixed, plug in real quoted costs from actual providers, run the net comparison line by line, and stress-test the results across realistic scenarios before treating any single number as a conclusion.
If the math works, you negotiate from a position of strength. If it doesn’t, you’ve saved yourself from a bad contract or a decision based on someone else’s projections.
Either outcome is worth the time it takes to build this model properly. The businesses that get burned by PEO arrangements are usually the ones who skipped this step and trusted a sales estimate. The ones who get real value are usually the ones who showed up knowing their numbers.
Before you sign or renew anything, make sure you’ve done this exercise with your actual data. And if you want a structured way to compare providers side by side once you have your numbers, don’t auto-renew. Make an informed, confident decision.
