Payroll & HR Outsourcing for SMBs: Which Model Fits?

Jan de Vries · 2026-05-22

If you run a U.S. company with 10 to 200 employees, picking the right payroll and HR partner can feel like a maze. The truth is, the best 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/HR suite when you want software without co-employment. An ASO works when you need admin help on your own setup. And an EOR is your move when you hire abroad without a local entity. This guide breaks down each model, names real providers, shows actual pricing, and gives you a framework you can use in an RFP. Let's cut through the jargon. ### Four Outsourcing Models Defined in Plain Language Choose your model by asking three simple questions: who employs the worker, who files payroll taxes, and where does the work happen? Terms get mixed up constantly, and that mistake leads to bad purchases. **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 may offer 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 require audited financial and operating standards. **Payroll/HR Software (HCM):** Your company remains 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):** Think of this as advisory and admin support without co-employment. Services are usually sold a la carte on your EIN, such as 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. | 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. Two quotes that look similar won't be comparable if you don't. 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. For remote teams, this can still be cheaper than setting up your own entity. > "The cheapest admin fee isn't always the best deal. Always ask for a total cost breakdown including all pass-throughs." ### How to Use This in an RFP When you send out an RFP, be specific about your needs. List your number of employees, their locations, and what benefits you currently offer. Ask providers to explain their fee structure in detail. Request references from companies similar to yours. And always ask about their compliance track record. This framework should help you narrow down the options fast. Remember, there's no one-size-fits-all solution. The right choice is the one that matches your business today, not the one you hope to become tomorrow.