Payroll & HR Outsourcing: Which Model Fits Your SMB?

Jan de Vries · 2026-05-22

For a U.S. company with 10 to 200 employees, picking the right payroll and HR outsourcing model can feel like a minefield. You've got PEOs, HCM suites, ASOs, and EORs all claiming to be the answer. But here's the thing: the right choice depends on what you actually need. Use a PEO when you want payroll, benefits, and compliance bundled under co-employment. Go with a payroll or HR suite when you just want software and full control. Choose an ASO for admin help on your own setup. And pick an EOR when you're hiring abroad without a local entity. This guide breaks down each model, names real providers, gives you actual pricing, and hands you a framework you can use in an RFP. No fluff, just what works. ### Four Outsourcing Models Defined in Plain Language Let's cut through the jargon. The model you choose comes down to three things: who employs the worker, who files payroll taxes, and where the work happens. Terms get mixed up all the time, and that mistake can lead to a bad purchase. **PEO (Professional Employer Organization)** – This is a co-employment arrangement. The provider files payroll taxes under its own employer identification number (EIN), pools benefits, and often offers workers' comp, safety programs, and compliance support. More than 230,000 U.S. businesses partner with a PEO, representing about 15 percent of employers with 10 to 499 employees and over 4.5 million worksite employees. Look for IRS Certified PEO (CPEO) status and ESAC accreditation, which means audited financial and operating standards. **Payroll/HR Software (HCM)** – Your company stays the sole employer. The vendor files taxes under your EIN and sells payroll, time tracking, benefits administration, and compliance tools as modules. HCM stands for human capital management—it's the software layer for employee data and HR workflows. **ASO (Administrative Services Organization)** – This is advisory and admin support without co-employment. Services are usually sold a la carte on your EIN. Think payroll admin, handbook help, or compliance advice. **EOR (Employer of Record)** – The provider becomes the legal employer in-country, so you can hire internationally without opening a local entity. A PEO requires a domestic entity and works through co-employment. An EOR removes that requirement entirely.  ### When Each Model Fits Your Business Start with your legal footprint. The right model depends on where you hire and how much employer control you want. Match the option to your current risk, not your future wish list. Here's a quick table to help you compare: | Factor | PEO | Payroll/HR Suite | ASO | EOR | |--------|-----|------------------|-----|-----| | Employer of record | Co-employment | You | You | EOR provider | | Payroll tax filing | PEO's EIN | Your EIN | Your EIN | EOR's entity | | Benefits approach | Pooled master plan | Your own plans | Your own plans | Statutory + provider plans | | Typical fee basis | PEPM or % payroll | Base + per person | Per service | Flat PEPM | | Best when | U.S.-only, want one bundle | Have HR staff, want control | Need advisory only | Hiring abroad, no entity | A simple test helps. If everyone is U.S.-based and you want one bundled admin layer, compare PEOs. If you want software and full employer control, compare payroll suites. If you only need expert support, ask ASO firms for a service menu. If one hire is abroad and you have no entity there, start with an EOR. ### Cost Models You Should Expect Separate admin fees from pass-through costs. If you don't, two quotes that look similar won't be comparable. The lowest admin fee can still produce the highest total cost. **PEO pricing** – Flat per employee per month or a percentage of gross payroll, plus pass-through costs for benefits and workers' comp. Justworks publishes two tiers, and third-party summaries in 2026 cite $59 and $99 per employee per month for smaller teams. Oyster's U.S. PEO page lists an $89 PEO fee plus a $25 platform fee per employee per month, plus a one-time $500 implementation fee. ADP TotalSource and Paychex PEO remain quote-based. **Payroll/HR suites** – Transparent base plus per-person fees are more common here. Gusto's 2026 pricing lists its Simple plan at $49 per month plus $6 per person, with higher tiers for deeper HR features. **EOR pricing** – Published list prices run much higher because the provider becomes the legal employer abroad. Deel starts at $599 per employee per month. ### A Quick RFP Framework When you're ready to compare, use these questions in your RFP: - Who is the legal employer for tax purposes? - What's the all-in cost per employee per month, including all fees and pass-throughs? - What benefits are included in the base fee? - How does the provider handle compliance with state and federal laws? - What's the onboarding timeline and implementation support? This framework helps you compare apples to apples. Don't let providers hide costs in vague terms. Get everything in writing. ### Final Thoughts Choosing the right model isn't about picking the most popular option. It's about matching the model to your business reality. If you're all in the U.S. and want simplicity, a PEO might be your best bet. If you have an HR team and want control, go with a payroll suite. Need just a little help? An ASO could save you money. Hiring globally? An EOR is your only real option. Take your time, ask the right questions, and you'll find a solution that works.