Insperity vs TriNet: 2 Full-Service PEOs Compared
Insperity vs TriNet compared: neither publishes rates, and the fee structures differ. What each PEO includes, what it costs, and who should pick which.
Insperity vs TriNet
A head-to-head on two quote-only PEOs: how each one structures its fee, what the base offering actually includes, where each is genuinely stronger, and which kind of small business should pick which
A founder with 30 people once asked me which of these two was cheaper, and I could not answer. Not because I had not looked, but because there is nothing to look at. Neither company publishes a price. I spent an afternoon reading both pricing pages and came away with exactly one number between them, and that number is labeled an example.
That is the honest starting point for Insperity versus TriNet. These are not software subscriptions with a feature grid and a checkout button. They are professional employer organizations, which means each becomes a co-employer of your staff, files payroll taxes under its own tax ID, sponsors the health plan your people enroll in, and carries the workers compensation policy. You do not buy a tool. You change how your company employs people.
So this comparison does something different from a feature roundup. It sets out what each company will actually tell you before a sales call, how the two describe the basis of their fees, what sits inside the base offering, and the handful of situations where one is clearly the better answer. There is no universal winner here, and anyone who names one has not read either pricing page.
Insperity vs TriNet at a glance
Both companies run payroll, file employment taxes under their own tax ID, sponsor and administer group health plans, carry workers compensation coverage, and provide HR advisory support. They are also close in size: Insperity paid an average of 310,089 worksite employees per month in 2025, and TriNet ended the same year with roughly 323,200. The differences sit in fee structure, product range, and where each one points its service model.
| Insperity | TriNet | |
|---|---|---|
| Founded | 1986 | 1988 |
| Main PEO product | Insperity HR 360 | TriNet PEO |
| Published rates | None at any headcount | None at any headcount |
| How the company describes its fee | Payroll of worksite employees plus an amount reflected as a percentage of payroll cost | Flat fee per employee per month, never a percentage of payroll |
| Any figure published at all | No | One illustration: 20 employees at a $150 rate equals $3,000 a month |
| Stated size bands | Under 50, 50 to 149, and 150 to 5,000 employees | A minimum worksite employee count is required, number not published |
| Non-PEO option from the same vendor | Insperity HR Core, priced per employee per month | TriNet HR Plus, an ASO with no co-employment |
| Workday-based option | Insperity HR Scale, first clients expected in early 2026 | Not offered |
| Global hiring | Not described in its 2025 annual report | TriNet Global add-on, 150+ countries and 120+ currencies |
| IRS certified PEO | Yes, its two primary PEO subsidiaries | Yes, through a subsidiary |
| Named industry focus | Manufacturing, IT and technology, professional services, financial services | Technology, financial services, life sciences, nonprofit, professional services, main street |
| Scale in 2025 | 310,089 average worksite employees paid per month | About 323,200 worksite employees at year end, $70 billion in payroll processed |
Read that table as two versions of the same business with different centers of gravity. TriNet leans on scale, industry verticals, and a fee model it markets as predictable. Insperity leans on a field service organization and a product ladder that runs from a non-PEO platform up to a Workday tenant. Neither will show you a price, so the comparison starts with two quote processes rather than two numbers.
Insperity reviewed
Insperity is the older of the two and says it pioneered the category, having provided PEO services since it was organized in 1986 under its former name. Its flagship is Insperity HR 360, renamed from Workforce Optimization, which its 2025 Form 10-K identifies as its largest source of revenue. That solution covers payroll and employment administration, employee benefits, workers compensation, government compliance, performance management, and training and development, delivered through its own Insperity Premier platform.
The service model is the part worth paying attention to. Insperity describes a high-touch approach in advisory areas such as recruiting, performance management and training, and it backs that with physical presence: 90 sales offices across 44 markets as of the end of 2025, plus service centers that coordinate PEO services regionally and provide face-to-face support. If you want a named team you can meet rather than a ticket queue, that is a genuine structural difference from a purely remote service model.
The product ladder is the other differentiator. Insperity HR Core, renamed from Workforce Acceleration, is a traditional payroll and human capital management solution for clients who do not want co-employment at all, priced per employee per month. Above HR 360 sits Insperity HR Scale, which pairs the same service model with a Workday HCM tenant; the annual report states an initial group of clients was expected to begin using it in the first quarter of 2026. Very few PEOs offer a path onto enterprise HCM without a full replatform.
Pricing is where patience is required. The Insperity pricing page shows no rate for anything. HR Core is described only as having a per-employee, per-month structure with add-ons such as applicant tracking, scheduling and 401(k) integration subject to additional fees. HR 360 asks you to request a custom proposal based on workforce size, payroll, tax, workers compensation, employment practices liability insurance and your contribution to benefits packages. Its annual report is more specific about the basis: the comprehensive service fee consists of the payroll of worksite employees plus an additional amount reflected as a percentage of the payroll cost of those employees.
TriNet reviewed
TriNet is the larger of the two by worksite employee count and describes itself as the largest publicly traded US company focused primarily on the PEO business by market capitalization. Founded in 1988, it processed $70 billion in payroll and payroll taxes in 2025 and ended the year with approximately 323,200 worksite employees. Its offering covers payroll and tax administration, access to medical, dental and vision plans, a managed 401(k), workers compensation, risk mitigation and compliance consulting.
Industry focus is the differentiator it leans on hardest. Its annual report names technology, financial services, life sciences, nonprofit, professional services and main street as its primary targeted verticals, and states that its sales organization is structured by vertical so it can address the distinct needs of each. For a life sciences company hiring researchers or a nonprofit with a specific compliance profile, that shaping is worth more than a marginally lower rate.
On pricing, TriNet is more forthcoming than Insperity without actually publishing a number. Its pricing page explains and defends the model: a flat fee per worksite employee per month rather than a percentage of payroll, so administrative fees stay the same when you give someone a raise, and charges go down when an employee reaches the Social Security or unemployment tax maximum. The page then confirms that TriNet does not publish standard list pricing, requires a minimum worksite employee count without naming it, and routes you into a three-step quote.
Two structural details matter before you sign. TriNet Global lets US clients hire, onboard and pay people in more than 150 countries and across 120 currencies, but it is sold only as an add-on to the PEO and never standalone, so it is not a reason to buy TriNet unless you are also buying the PEO. Separately, TriNet reorganized its non-PEO side in 2025: it expanded its administrative services offering into HR Plus, and its annual report notes that the transition from its prior HRIS offering increased attrition among that population. The software TriNet acquired as Zenefits is now sold as the TriNet HR Platform, and the same filing is explicit that TriNet is winding down that software-only product and migrating those clients onto its ASO services, ending 2025 with roughly 39,700 ASO users against about 18,600 legacy platform users. If standalone HR software is what you are shopping for, HR Plus is the current offer rather than the old platform.
What each costs at 10, 25, and 50 employees
Every fee in this table reads Quote, and that is the finding rather than a gap in the research. Neither company publishes rates, so nobody outside a sales process can fill it in. What follows is everything that can be stated honestly from public sources, clearly labeled.
| Line item | 10 employees | 25 employees | 50 employees | Notes |
|---|---|---|---|---|
| Insperity HR 360 service fee | Quote | Quote | Quote | Custom proposal built from payroll, tax, workers comp, EPLI and benefits |
| Insperity HR Core fee | Quote | Quote | Quote | Per employee per month structure, rate not published |
| TriNet PEO administrative fee | Quote | Quote | Quote | No standard list pricing at any headcount |
| TriNet published example | Quote | Quote | Quote | TriNet publishes one illustration only, at 20 employees: a $150 rate gives a $3,000 monthly fee |
| Medical, dental and vision premiums | Quote | Quote | Quote | Excluded from both fees, underwritten on your census |
| Employer payroll taxes | Your cost | Your cost | Your cost | FICA, FUTA and state unemployment stay your cost either way |
The single published figure deserves care. TriNet uses a 20-employee example at a $150 rate to explain what per employee per month means, then states that its pricing plans are for new clients only and can vary by region, industry, company size and scope of services. That is an illustration of the arithmetic, not a rate you can hold anyone to, which is why this table does not extend it to other headcounts. Insperity offers no comparable illustration, which means the honest answer for its column at every headcount is a proposal.
Because you cannot compare the level of the two fees in advance, compare the basis instead. That is knowable today, and it changes the answer for some companies more than any rate would.
| When this happens | Flat fee per employee per month | Fee tied to payroll cost |
|---|---|---|
| An employee gets a raise | Administrative fee is unchanged | Fee rises with the higher payroll |
| An employee maxes out Social Security | Charges go down | The percentage keeps applying to wages |
| An employee elects a pre-tax medical deduction | Tax-related charges go down | Taxable payroll falls, so the fee follows it down |
| You hire one more person | Fee rises by one flat unit | Fee rises by that person's share of payroll |
| Your team is highly paid | Cost is driven by headcount | Cost is driven by salaries |
| You run a large seasonal crew at low wages | Cost is driven by headcount | Cost stays proportional to a smaller payroll |
The practical read is about your payroll shape rather than your headcount. A 25-person software company with high salaries and regular raises is exposed to a payroll-linked fee in a way a 25-person operations business is not. A company with a large lower-wage crew is exposed to a flat per-head fee in the same way. Neither structure is better in the abstract, which is exactly why a universal winner does not exist here.
What each base offering actually includes
The base offerings are closer than the marketing suggests. Both sponsor and administer the health plan, both carry workers compensation, both report and remit federal payroll taxes under their own tax ID, and both include a proprietary HR platform. The differences are at the edges of the product line rather than in the core.
| Included in the base PEO offering | Insperity HR 360 | TriNet PEO |
|---|---|---|
| Payroll processing and employer tax filing | ||
| Co-employment under the provider tax ID | ||
| Provider sponsors and administers the health plan | ||
| Workers compensation coverage | ||
| Proprietary HR platform included | ||
| A price you can check without a sales call | ||
| Any published illustration of the fee | ||
| Global hiring available from the same vendor | ||
| A Workday-based option from the same vendor |
Two rows carry most of the weight. If you employ or plan to employ people outside the United States, TriNet answers a question Insperity does not describe answering. If you expect to need enterprise-grade HCM and would rather not migrate off your PEO to get it, Insperity HR Scale is the only path of its kind between these two.
Both also clear the compliance bar that matters most in this category. Insperity states in its annual report that its two primary PEO subsidiaries received certified professional employer organization designations from the IRS, and TriNet states that a subsidiary holds the same classification. Both appear on the IRS public listing of certified PEOs. Under the IRS certification program, a certified PEO carries sole liability for federal employment taxes on the wages it processes, which is protection you do not get from an uncertified provider.
What neither fee includes is the same at both companies. Health, dental and vision premiums are quoted after underwriting. Workers compensation premiums are quoted after a risk review. Employer FICA, federal unemployment and state unemployment tax remain your cost either way. TriNet also names background checks, drug screening, premium learning courses and certain risk-mitigation services as separate add-ons, while Insperity flags applicant tracking, talent acquisition services, retirement services and insurance services as fee-based additions.
Where each is genuinely stronger
Neither wins outright, and the useful version of this comparison is a routing table rather than a verdict. Each row below reflects something one company publishes and the other does not.
| If this is true of you | Lean toward | Why |
|---|---|---|
| You employ or will employ people abroad | TriNet | TriNet Global covers 150-plus countries as a PEO add-on |
| Salaries are rising fast and headcount is flat | TriNet | Flat per-employee fees do not move when you give a raise |
| You are in life sciences or nonprofit | TriNet | Both are named primary verticals with sales built around them |
| You want a local team you can meet | Insperity | 90 sales offices in 44 markets, with regional service centers |
| You expect to need Workday-grade HCM | Insperity | HR Scale pairs the PEO service model with a Workday tenant |
| You may want to drop co-employment later | Either | Insperity HR Core and TriNet HR Plus both offer a non-PEO path |
| You need a price before a sales call | Neither | Both are quote-only, and only TriNet shows an example figure |
| Your work carries physical risk | Neither by default | Workers compensation underwriting decides eligibility first |
That last row is not a hedge. In this category the workers compensation decision comes before the software decision, because the carrier behind the master policy sets the appetite for construction, manufacturing floors, delivery fleets and similar work. Put your classification codes and loss history on the table in the first conversation rather than the fourth, so a decline arrives in week one instead of week six.
How to choose between them
Five questions separate these two faster than any feature list. Work through them in order, because the first two eliminate one provider outright for a meaningful share of readers.
On that last point, small employers going the standalone route can compare group options through the federal small business health options program. Reading what a plan costs on the open market makes a PEO quote much easier to judge, because you can finally see what you are buying out of and what the pooled rate is actually worth to you.
Before you choose
FirstHR is not a PEO. We do not process payroll, file payroll taxes, administer benefits, or enter co-employment. Both providers above do things we do not, and if payroll and group health are the problem in front of you, one of them is the answer, not us. I would rather say that plainly than sell you something that does not fit.
The question worth settling before you compare two quotes is whether you want a PEO at all. Co-employment is a structural change, not a purchase, and it comes with real trade-offs on control, portability and lock-in. The alternative is a standalone stack you assemble yourself: a payroll provider, an insurance broker, and an HR system you own outright.
Where FirstHR fits is the layer underneath either decision: onboarding workflows, e-signatures on offer letters and new hire paperwork, employee records and a team directory, document management, and training, at a flat $98 to $198 per month that does not move with headcount. Choose a PEO and that stays your system of record for the paperwork the PEO never touches. Build a standalone stack instead and it is the HR half of it.
Frequently Asked Questions
Is Insperity or TriNet cheaper?
Nobody can say from public information, because neither publishes a rate card. Insperity routes every buyer to a custom proposal built from workforce size, payroll, tax, workers compensation, liability insurance and your benefits contribution. TriNet states plainly that it does not publish standard list pricing. The only public figure is a TriNet illustration: 20 employees at a $150 rate produce a $3,000 monthly administrative fee, labeled an example. Even with two quotes, the health premiums usually decide the total.
How is Insperity pricing structured compared with TriNet?
Differently, and that is the most useful thing you can learn before a call. TriNet says it charges a flat fee per employee per month and never a percentage of payroll, so administrative fees stay level when you give a raise and fall when an employee hits the Social Security or unemployment tax maximum. Insperity describes its comprehensive service fee in its 2025 annual report as the payroll of worksite employees plus an additional amount reflected as a percentage of that payroll cost.
What is the minimum company size for Insperity and TriNet?
Neither publishes a hard floor. Insperity organizes its site around three bands: small business under 50 employees, midsize from 50 to 149, and large from 150 to 5,000. TriNet states on its pricing page that it does require a minimum worksite employee count without naming the number. If you are a very small team, ask in the first call rather than assuming, because a quote process that ends in a decline costs weeks.
Do Insperity and TriNet include health insurance in the fee?
No. Both sponsor and administer group health plans, so benefits administration sits inside the offering, but the premiums sit outside the fee. TriNet states that medical, dental and vision costs are separate and depend on plan selection, carrier rates and enrollment. Insperity prices each proposal partly on your contribution to benefits packages. Employer FICA, federal unemployment and state unemployment remain your cost at both.
Are Insperity and TriNet both certified PEOs?
Yes. Insperity states that its two primary PEO subsidiaries hold IRS certified professional employer organization designations, and TriNet states that a subsidiary carries the same classification, alongside accreditation from the Employer Services Assurance Corporation held since 1995. A certified PEO carries sole liability for federal employment taxes on wages it processes, which is why this credential is a floor on vendor risk rather than a way to separate these two.
What does Insperity offer that TriNet does not?
A route onto Workday without buying Workday directly, plus a heavier field presence. Insperity HR Scale pairs its PEO service model with a Workday human capital management tenant, with an initial client group expected to begin using it in early 2026, and the company ran 90 sales offices across 44 markets at the end of 2025. Confirm HR Scale availability for your size before you build a decision on it.
What does TriNet offer that Insperity does not?
Global hiring. TriNet Global covers more than 150 countries and 120 currencies for hiring, onboarding, payroll and compliance, sold only as an add-on to the PEO rather than standalone, and Insperity describes no international offering in its 2025 annual report. If you are weighing international employment more broadly, the PEO versus employer of record distinction matters more than the choice between these two vendors.
How hard is it to leave a PEO once you join?
Harder than cancelling software, because you unwind an employment structure. Payroll taxes are reported under the PEO tax ID, so leaving means re-establishing state withholding and unemployment accounts, moving to a direct workers compensation policy, and replacing group health written on the PEO master plan. A mid-year exit splits W-2 reporting. TriNet notes that most PEOs require an annual agreement and may include early-termination fees, and neither publishes its contract term, so read the agreement first.