PEO ROI: How to Run a Cost-Benefit Analysis

A useful PEO cost-benefit analysis sits somewhere in the middle. It compares your current costs with a realistic future setup, then separates direct savings from time savings and other benefits.

This guide shows you how to calculate PEO ROI, estimate break-even, and pressure-test the assumptions behind the numbers before you sign.

How to Calculate PEO ROI Without Overstating the Return

A professional employer organization (PEO) provides HR-related services through a co-employment arrangement, which shares selected employer responsibilities. For your business, focus on how the PEO would change your costs and workload, not how many services it lists.

Start with these formulas:

Annual net benefit = annual quantifiable benefits and savings − annual incremental PEO cost

ROI percentage = annual net benefit ÷ annual incremental PEO cost × 100

Here, incremental cost means the extra investment compared with your current setup. Don’t treat the whole PEO invoice as a new expense: wages, insurance, and employer taxes already exist outside a PEO.

Use one consistent approach:

1. Add the PEO’s service fee and new recurring administration costs.
2. Subtract current administration expenses the PEO actually replaces. This gives your annual incremental service cost.
3. Record insurance and employer-tax differences separately as savings, or negative savings if costs rise.
4. For year one, add transition costs to the investment before calculating net benefit and ROI.

Run a cash-only view first. Then add a separate capacity-inclusive view if you can show how the saved time will be used. If the PEO costs the same or less than your current setup, report the net savings and total costs instead of using an ROI percentage.

This model calculates ROI using the extra cost of switching, not the full PEO fee. So don’t compare the percentage directly with studies or proposals that use a different cost basis.

Step 1: Build a Baseline You Can Defend

Collect the last 12 months of invoices, payroll records, benefit bills, and HR time estimates. Adjust for known changes, such as planned hiring or an upcoming insurance renewal. Compare both options over the same period and employee population.

Use this current-state versus PEO checklist before you add the numbers:

Separate fixed costs, such as a flat consulting retainer, from variable costs, such as a per-employee subscription. A quote that works at today’s headcount may change as you hire.

Include benefits brokerage or administration, compliance support, and other vendors. Don’t list brokerage or administration charges twice if they’re already built into premiums. Include recruiting or training expenses only when the PEO replaces those services. Don’t assume the whole HR role disappears because some tasks move outside the company.

Step 2: Normalize the Proposal So Nothing Disappears

Ask for an itemized proposal showing administration fees, benefit premiums, workers’ compensation, employer taxes, add-ons, implementation, and contract charges. Request the fee basis, covered headcount, minimums, renewal terms, and excluded services.

Label each item as new, replacing an existing expense, retained, or pass-through. Compare employer-paid costs, and remember that employee deductions aren’t employer savings.

Keep any software you’ll still use in your future budget. If you use Connecteam for employee scheduling or its employee time clock, carry over your actual subscription cost unless you plan to cancel it. If you’re adding Connecteam, use the selected plan’s current price and evaluate its value separately. Don’t count improvements from another system as part of the PEO’s ROI.

Check which data transfers the proposed setup supports and whether integration work costs extra. Don’t assume your PEO replaces the tools employees use to manage daily work.

Step 3: Count Direct Savings Only When Spending Changes

For every saving, record the current amount, proposed amount, evidence, start date, and person responsible for confirming it.

Useful evidence includes cancellation terms for an old subscription, a reduced consulting contract, and a comparable insurance quote. Lower processing time is a cash saving only if it reduces paid overtime, contractor fees, or another actual expense.

Avoided future spending needs its own line. If the PEO removes the need for an approved hire, record the planned start date and cost. Don’t count an unapproved position as money saved, and don’t also value the same work as released capacity.

Step 4: Value Saved Time Without Calling It Cash

Estimate time saved for each task, then subtract the work that will remain, such as approvals, data checks, employee questions, and provider coordination.

Annual capacity value = hours released × loaded hourly labor cost × usable share

Loaded labor cost includes wages plus any employer costs you include, such as benefits and payroll taxes. Record what goes into the rate and how many hours you’re using. Then estimate how much of the time saved can realistically be redirected to useful work.

For example, 400 hours × an assumed $40 loaded rate × 75% usable time = $12,000 of capacity value. That’s not a $12,000 payroll reduction if salaries stay the same. It estimates the value of time redirected to work such as onboarding, hiring, or manager support.

Step 5: Check Whether Insurance Savings Are Really Comparable

Insurance savings can look substantial on paper, but only if you’re comparing equivalent coverage, limits, and terms.

Compare benefits without shifting costs onto employees

Match employee eligibility, enrollment tiers, employer contributions, provider networks, deductibles, out-of-pocket limits, prescriptions, and covered services.

Use the plans’ SBC comparison documents (Summaries of Benefits and Coverage) alongside the quotes. HealthCare.gov’s total-cost guidance also explains why premiums alone don’t show what employees could pay for care.

A richer plan can be worth paying for, but it isn’t a pure cost saving. A cheaper employer contribution that leaves employees paying more isn’t a like-for-like saving, either. Record the cost difference and the change in benefit quality separately.

Check workers’ compensation beyond the quoted rate

Compare class codes, payroll by job and state, claims history, experience modifiers where applicable, fees, deductibles, and policy structure. Ask who holds the policy, how audits and claims adjustments work, and what happens when you leave.

For example, California’s insurance regulator explains how payroll, job classifications, claims experience, and audits affect premiums. Rules vary by state, so ask your broker to check the actual policy terms rather than applying one state’s rules nationwide.

Step 6: Include the Work and Cost of Switching

Budget for payroll migration, HR data cleanup, benefits transition, employee communication, parallel payroll checks, integration changes, and vendor overlap. Record internal project hours separately from cash invoices.

Check the exit terms too, including notice periods, termination fees, data exports, insurance transitions, and the cost of moving payroll again. Add any known exit costs to the period when they would occur. For uncertain costs, include a realistic estimate in your downside scenario instead of assuming they’ll be zero.

Step 7: Calculate ROI and When Cash Pays Back

Calculate recurring annual results and first-year results separately. The first year includes transition costs, while later years need their own renewal and headcount assumptions.

For a simple cash payback estimate:

Months to break even = upfront cash transition cost ÷ monthly recurring net cash benefit

Monthly recurring net cash benefit is annual cash savings minus annual incremental recurring cost, divided by 12. This method assumes costs and savings begin together and arrive evenly. If the monthly result is zero or negative, there’s no cash payback under those assumptions.

For delayed savings, seasonal staffing, or prepaid premiums, build a month-by-month cash forecast instead. Keep noncash capacity out of a cash payback calculation.

Worked Example: PEO ROI for a 50-Employee Business

This is a hypothetical example, not a market benchmark or provider quote.

A 50-employee field-service business is considering a PEO. To make things simple, assume that headcount, benefits enrollment, coverage, payroll, and employer tax costs stay the same for 12 months. The figures are before income tax and don’t discount future cash flows.

The assumed PEO fee is $100 per employee per month, or $60,000 a year for 50 employees. There are no additional recurring add-ons. The PEO replaces two existing vendor costs from day one, while internal salaries and workforce software costs stay the same.

Other wages and unchanged employer payroll taxes are left out because they’re the same in both scenarios. The software cost is a hypothetical budgeting assumption, and any insurance savings assume equivalent coverage with no increase in employee contributions.

Here’s how to work through the cost-benefit analysis:

First, calculate the cash-only return

• Incremental recurring cost: $60,000 − $12,000 − $18,000 = $30,000.
• Separate annual cash savings: $36,000 from health contributions + $6,000 from workers’ compensation = $42,000.
• Recurring annual net benefit: $42,000 − $30,000 = $12,000.
• Recurring annual ROI: $12,000 ÷ $30,000 × 100 = 40%.

The $12,000 net benefit also matches the difference between the table’s totals. That cross-check helps catch double counting.

Assume upfront cash costs of $3,000 for migration, $2,000 for integration changes, and $1,000 for vendor overlap: $6,000 total. These are additional to recurring costs.

• First-year cash investment: $30,000 + $6,000 = $36,000.
• First-year cash net benefit: $42,000 − $36,000 = $6,000.
• First-year cash ROI: $6,000 ÷ $36,000 × 100 = 16.7%.
• Cash payback: $6,000 ÷ ($12,000 ÷ 12) = 6 months.

This assumes immediate, even monthly savings and no exit during year one.

Then show capacity as a separate result

Assume the PEO releases 400 hours of recurring internal work, with 75% put to productive use at the $40 loaded hourly rate. That adds $12,000 in estimated capacity value. The hours exclude work removed with the canceled vendor contracts.

The assumed baseline hourly rate comprises $32 in wages plus $8 in employer taxes and benefits. It’s a proxy for valuing time, not another cash saving or an adjustment to the separate insurance savings.

Implementation also uses 100 salaried staff hours at $40: $4,000 in noncash project time. Salaries don’t change, so this belongs in the capacity-inclusive view, not cash spending.

First-year capacity-inclusive net benefit is ($42,000 + $12,000) − ($30,000 + $6,000 + $4,000) = $14,000. On that $40,000 investment basis, ROI is 35%. The cash benefit remains $6,000, not $14,000.

Test what happens if the assumptions change

The scenarios below change only insurance savings and the usable share of the same 400 released hours. All fees, displaced vendor costs, and transition costs stay fixed.

These are assumptions to test, not probabilities or promised results. Also test fee increases, hiring, delayed implementation, and benefit renewals before committing.

What Research Says (And What It Can’t Tell You)

Industry research can add context, but it can’t replace your own quote and cost baseline. Two widely cited studies were commissioned by the National Association of Professional Employer Organizations (NAPEO), the industry trade association, and written by Laurie Bassi and Dan McMurrer of McBassi & Company.

The historical ROI estimate

NAPEO’s September 2019 study estimated a 27.2% annual return from cost savings. Its research sample included 132 PEO clients and 44 non-clients recruited through a voluntary survey.

The calculation combined survey data, external benchmarks, and a 2018 industry cost estimate rather than tracking each company’s actual cash return. Treat it as a historical estimate, not a current market benchmark or a return you should expect.

The newer business-outcome analysis

NAPEO’s September 2024 report looked at growth, turnover, and business survival. Its growth analysis used PEO-supplied data from more than 15,000 client businesses.

Employment grew 4.3% from January 2023 to January 2024, compared with 1.9% in a benchmark weighted to reflect similar business sizes. Separate analyses also found lower turnover and higher business survival among PEO clients.

These findings show associations, not proof that PEO use caused the differences. Companies that choose PEOs may differ in ways the research can’t fully account for. The 2024 report also doesn’t calculate fee-adjusted ROI, so don’t treat those reported outcomes as guaranteed savings in your own ROI model.

Keep Hard-to-Price Benefits Visible Without Inventing Values

Some outcomes matter even when you can’t attach a reliable dollar amount. Use this checklist alongside the financial model:

• Compliance support: What advice, training, or review is included? Who still owns each task?
• Employee experience: Will staff get clearer answers, faster help, or easier enrollment?
• Benefit competitiveness: Does the package meet the needs employees have actually raised?
• Manager time: Which recurring problems should take less time to resolve?
• Retention and hiring: Which measurable outcome do you expect to improve, and why?
• Expertise and risk reduction: Which specialist gaps will the PEO cover, and what remains outside scope?

Record an owner, evidence needed, and review date for each. Keep values qualitative until you have support. If you model retention savings, use your own replacement costs and a cautious scenario, not a guaranteed percentage from an industry study.

Confirm your tax, insurance, and contract details with a qualified adviser before relying on them.

When a PEO May Not Pay Off

The case for PEO is weaker when:

• Your HR processes are already efficient, with little cost or admin work to cut.
• Your current insurance is more competitive than the comparable PEO option.
• The fee is high for the services and risk support you actually need.
• Most of the bundle duplicates vendors, tools, or internal work you’ll keep.
• Transition or exit costs outweigh the expected benefit.
• The model only works after adding uncertain retention or risk savings.

For example, if you keep your current vendors and insurance, you may mainly be paying for access to HR support and advice. That can still be valuable, but the case should rest on service value rather than savings that never materialize.

Also compare the PEO with more targeted alternatives, such as outside HR support or improvements to your current setup. The real choice isn’t always between a PEO and doing nothing.

Back Up PEO with Real Numbers

The ROI of using a PEO depends on the costs you can actually remove, the services your team will use, and whether the numbers still hold up once you test them.

Start with the cash-only case so you can see the direct financial impact. Then layer in time savings, added capacity, and softer benefits separately. After implementation, revisit the model and compare the forecast with what really changed in your costs, workload, and service levels.