Your HR costs are about to double, and nobody told you why.

Somewhere around the 40-employee mark, most business owners hit a wall. Payroll is getting complicated. Benefits administration is eating entire afternoons. Compliance questions keep arriving from provinces you barely operate in. And the person who used to “handle HR on the side” is now spending 60% of their time on it.

So you start searching. And immediately, you face a fork in the road that will shape your business for years. On one side: a Professional Employer Organisation (PEO) that promises to take the entire HR burden off your plate. On the other: HR software that gives your team the tools to manage it themselves.

Quite frankly, the wrong choice could cost you hundreds of thousands of dollars over the next five years. Both options have impressive sales decks. Both claim to solve the same problem. And most comparison articles online are written by companies selling one or the other, so good luck getting a straight answer.

We build HR software at Workzoom, so you know where we sit. But PEOs are genuinely the right answer for some businesses, and pretending otherwise would waste your time. What we want to do here is give you an honest framework with real numbers, real trade-offs, and the questions nobody else is asking.

PEO vs HR software: the core difference

A PEO enters into a co-employment arrangement with your business. Your employees become jointly employed by both you and the PEO. You keep day-to-day management. The PEO handles payroll processing, benefits administration, workers’ compensation, and regulatory compliance. Your employees’ paycheques come from the PEO, benefits run under the PEO’s master policies, and tax filings happen under their accounts. Think of it as renting someone else’s HR department. You get their infrastructure, their expertise, their buying power. But you also get their rules, their limitations, and their price tag.

HR software gives your team a platform to manage those same functions, but you stay in the driver’s seat. Payroll, benefits, time tracking, performance management, recruiting, onboarding. The software automates the mechanics. Your people make the decisions. What used to require a 10-person HR department can now be managed by two or three people with the right technology. Software is a tool. A PEO is a service. And that distinction matters more than most comparison articles acknowledge.

The real cost comparison (with actual numbers)

This is where most PEO vs software articles genuinely fall apart. They either quote ranges so wide they are useless or skip the math entirely. So let us do this properly.

PEOs typically charge a flat per-employee fee or a percentage of gross payroll. The range is $40 to $160 per employee per month, or 2% to 12% of total gross payroll. NAPEO puts the average annual cost at $1,395 per employee. The percentage-of-payroll model means your costs rise with every raise, every bonus, every overtime hour. And those percentages typically cover basic services. Enhanced recruiting, customised reporting, keeping your existing benefits broker? Extra.

HR software is generally priced per employee per month, with costs ranging from $4 to $45 depending on the platform and modules selected. Implementation fees are common, ranging from $2,000 to $10,000+ for mid-market deployments, though some vendors include implementation at no extra cost. The same 250-employee company would pay roughly $12,000 to $135,000 annually for software. Even at the high end, that is a fraction of most PEO arrangements.

Side-by-side: 250 employees, $55,000 average salary

Yes, you need to factor in HR staff with the software model. But even with two dedicated HR people on payroll, the software path is typically $200,000 to $400,000 cheaper per year.

And the gap widens as you grow. The percentage-of-payroll model scales with compensation, while software costs grow much more slowly. A company with 250 employees at a 4% PEO rate pays roughly $550,000 per year. At 6%, that climbs to $825,000. Meanwhile, complete HR software from a platform like Workzoom costs $48,000 per year at $4 per employee per month for all four suites. Even adding two full-time HR staff at $70,000 each, the all-in cost is under $200,000. The $350,000+ annual gap is not an exaggeration. It is arithmetic.

The decision framework: PEO or software?

After years of watching businesses make this choice, here is the simplest framework we have found.

A PEO makes sense when:

• You have fewer than 30 employees and zero HR capacity. NAPEO’s research shows PEO-backed businesses grow 7% to 9% faster and are 50% less likely to go out of business. For very small companies, the expertise alone can be worth the premium.
• You are entering a new country without a legal entity. A PEO (or Employer of Record) lets you hire employees before setting up permanent operations. Particularly relevant for Canadian companies testing the US market, or international firms hiring first Canadian employees.
• You need enterprise-grade benefits at small-business scale. PEOs pool thousands of employees across their client base, giving benefits purchasing power a 30-person company could never match alone.

HR software wins when:

• You have 50+ employees and at least one HR person (or plan to hire one). The economics are not even close at this point. Remember the 250-employee math above. That gap compounds every single year.
• You want to own the employee experience. Co-employment means your people receive paycheques from an entity they have never heard of. Benefits decisions get made outside your organisation. With software, your brand is on everything.
• You operate in Canada. The PEO industry is overwhelmingly American. Canada has fewer providers, less regulatory clarity around co-employment, and no equivalent to NAPEO’s certification programme. Each province has distinct employment standards, and most PEOs serving Canadian businesses are international firms, not Canadian-built organisations with deep provincial expertise. Canadian-built HR software handles CRA source deductions, CPP/CPP2, EI, ROEs, T4s, and Quebec-specific requirements natively.
• You care about data sovereignty. With a PEO, your employee data lives in their systems, under their security controls. With Canadian-owned HR software on Canadian infrastructure, your data stays in Canada, governed by Canadian privacy law.
• You want predictable costs that do not scale with payroll dollars.
• You plan to grow and do not want switching costs later.

Most businesses reading this are in the 50 to 500 employee range. For that group, the answer is almost always software. The economics are better, the control is better, and the long-term flexibility is better.

Quite frankly, the PEO model was designed for a world where HR technology was expensive, complicated, and inaccessible to mid-market businesses. That world does not exist anymore.

Three questions nobody asks (but should)

If you are leaning PEO or software, these questions will save you from the most common regrets.

1. What happens when you want to leave?

This is genuinely the question PEO sales teams least want to hear. Leaving a PEO means untangling co-employment, transitioning benefits, migrating payroll history, and re-establishing tax accounts. Some businesses report the transition taking three to six months and costing tens of thousands of dollars. With software, switching is still work. But your data is yours, your tax accounts are yours, your benefits relationships are yours. The transition is a technology migration, not a legal restructuring.

2. How do costs change as you grow?

PEO costs scale with headcount and compensation. Every raise, every new hire, every bonus increases the bill. Software has per-employee pricing that scales linearly, but the rate stays flat or even decreases at higher volumes. Model your costs at 1.5x and 2x your current size. The PEO model’s total cost grows much faster because it is tied to payroll dollars, not just headcount.

3. What do you actually lose control of?

Ask the PEO for a specific, written list of decisions that require their approval or involvement. Benefits plan changes, policy modifications, termination procedures, compliance reporting. You may be surprised at how much operational control shifts to the PEO in a co-employment arrangement. Your employees will notice too. A PEO’s name appears on tax forms, benefits cards, and sometimes paycheques. New hires onboard partly through the PEO’s systems. With software, every employee-facing touchpoint carries your brand.

What to do next

Get your real numbers. Pull your total payroll for the last 12 months. Multiply by the PEO percentage you have been quoted. Compare that to the per-employee cost of the software platforms you are considering, plus the cost of internal HR staff. The math will do most of the deciding for you.

Talk to businesses that have left a PEO. Not the ones currently using one. The ones who switched to software after three or four years. Ask them what the transition cost, how long it took, and whether they would do it again. Their answers will be more valuable than anything a sales team tells you.

Ask about Canadian compliance in particular. If you are evaluating a PEO or software, ask pointed questions about ROE automation, CPP2 handling, Quebec payroll, and provincial employment standards. The depth of the answers will tell you how seriously they take the Canadian market.

And if you want to see what the software path looks like with a platform built in Canada for Canadian businesses, we are happy to show you Workzoom in a 15-minute call. No pressure, even if the honest answer is that a PEO makes more sense for you right now.