Payroll and HR Outsourcing for SMBs: A Guide

Jan de Vries · 2026-05-22

So you're running a U.S. company with 10 to 200 employees, and you're wondering who to trust with payroll, benefits, and compliance. It's a real headache, right? The right choice comes down to one simple thing: what outcome do you actually want? Use a PEO when you want everything bundled together under co-employment. Go with a payroll or HR suite when you just need software and want to keep full control. An ASO is your pick if you only need admin help on your own setup. And an EOR is the way to go when you're hiring abroad without a local entity. This guide breaks down each model, names the big providers, gives you real pricing, and hands you a framework you can use in an RFP. No fluff, just what you need. ### Four Outsourcing Models Defined in Plain Language Terms get mixed up all the time, and that mistake leads to bad purchases. So let's clear it up. Choose the model by who employs the worker, who files payroll taxes, and where the work happens. **PEO (Professional Employer Organization):** Think of this as co-employment. The provider files payroll taxes under its own employer identification number (EIN), pools benefits, and often handles workers' comp, safety programs, and compliance support. More than 230,000 U.S. businesses use a PEO, which is about 15 percent of employers with 10 to 499 employees. That's 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 admin, and compliance tools as separate modules. HCM stands for human capital management, which is just a fancy name for the software layer that handles 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, like payroll admin, handbook help, or compliance advice. It's perfect when you have your own setup but need a hand. **EOR (Employer of Record):** The provider becomes the legal employer in-country, so you can hire internationally without opening a local entity. A PEO needs 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 cheat sheet: - **PEO:** Best when you're U.S.-only and want one bundle. Employer of record is co-employment. Payroll tax filing uses the PEO's EIN. Benefits come from a pooled master plan. Typical fee is per employee per month (PEPM) or a percentage of payroll. - **Payroll/HR Suite:** Best when you have HR staff and want control. You are the employer of record. Payroll tax filing uses your EIN. You keep your own benefit plans. Fee is usually a base plus per person. - **ASO:** Best when you need advisory only. You are the employer of record. Payroll tax filing uses your EIN. You keep your own benefit plans. Fee is per service. - **EOR:** Best when hiring abroad with no entity. The EOR provider is the employer of record. Payroll tax filing uses the EOR's entity. Benefits are statutory plus provider plans. Fee is flat PEPM. A simple test: 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 might not be comparable at all. 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. That's a big jump, but it's the price of global hiring without setting up your own entity. ### A Final Framework for Your RFP When you're ready to compare providers, use this framework. Ask each vendor: What is your fee structure? What pass-through costs should I expect? Do you have CPEO or ESAC accreditation? How do you handle compliance? And for EORs, what countries do you cover? This way, you're not just guessing. You're making a decision based on real numbers and your specific needs. Good luck, and remember, the best choice is the one that fits your business today.