PEO vs ASO vs Outsourced HR vs Fractional HR: Which Fits Your New England Business?

If you’ve started shopping for outside HR help, you’ve probably noticed that every provider describes itself a little differently.

EANE doesn’t sell payroll, benefits, or insurance, so we have no stake in whether you choose a PEO or an ASO.

The Short Answer: PEO vs ASO

A PEO (professional employer organization) enters a co-employment arrangement with your business. Your employees appear on the PEO’s payroll and tax filings, the PEO sponsors the benefits plans, and you keep running the business day to day.

An ASO (administrative services organization) handles much of the same administration, including payroll, benefits enrollment, and HR paperwork. You remain the only employer. The tax filings and benefits plans stay in your company’s name.

If a broker mentions an ASO, ask which kind they mean. In benefits, the same letters stand for administrative services only, a self-funded health plan.

PEO vs ASO vs Outsourced vs Fractional HR at a Glance

	PEO	ASO	Outsourced HR	Fractional HR
Legal employer	You and the PEO (co-employment)	You	You	You
Payroll and benefits	The PEO	The ASO	You, with your payroll provider and broker	You, with your payroll provider and broker
Who handles employee issues	A shared service team; depth varies by plan	Varies, often limited	An outside HR team, by project or ongoing	A named HR professional who works with you each month
How it’s priced	Percentage of payroll or per employee	Per employee per month	By project, hourly, or monthly	Monthly fee for a set number of hours
Usually fits	Smaller employers that want benefits and payroll bundled	Employers that want administration handled under their own name	Employers that need HR expertise and want to keep their payroll	Employers that have outgrown doing HR themselves

What Each Model Does Well, and What to Watch For

PEO (Professional Employer Organization)

A PEO takes on payroll, payroll taxes, benefits, and workers’ comp as your co-employer. For a 15-person company with no HR person and no benefits broker, that bundle can be a relief. You get one bill, one portal, and access to the PEO’s benefits plans.

Before you sign with a PEO, check four things:

• Renewal history. Your health costs still depend on claims, in your own group and across the PEO’s pool. Ask what clients your size saw at their last two renewals.
• An itemized fee breakdown. Admin fees, benefits, and workers’ comp should be listed separately so you can compare providers line by line.
• Liability. Co-employment shares some responsibilities. Employment decisions stay with you.
• Who answers the phone. Many PEOs support clients through a service center. Ask who your contact will be and how often clients get reassigned.

We covered when a PEO is the right call, and the signs you’ve outgrown one, in PEO Alternatives: What to Consider Before You Sign or After You Want Out.

ASO (Administrative Services Organization)

An ASO handles payroll processing, benefits administration, and HR paperwork without becoming your co-employer. You keep your own tax ID and, in many cases, your own benefits broker and plans.

Service lists vary widely. Some ASOs offer payroll with a few HR forms attached, and others include a dedicated HR contact. Get the list in writing, and ask who you’d call about an employee problem that has nothing to do with paperwork. If you’re weighing your payroll company’s HR add-on, we looked at where those tend to fall short in Is Your Payroll Company’s HR Enough?

Outsourced HR

“Outsourced HR” gets used for everything from PEOs to a consultant you call twice a year. In this guide, it means an outside HR team that handles the expertise side of HR while your payroll and benefits stay with your current providers.

Sometimes that’s a single project, like a handbook rebuild, a workplace investigation, or an HR audit. Sometimes it’s ongoing support, with the outside team covering much of what an internal HR department would.

Fractional HR

Fractional HR puts an experienced HR professional on your team for a set number of hours each month. They learn your business and your people, answer the day-to-day questions, and move the projects that keep sliding to next quarter. Employers also use fractional HR for interim coverage when their HR person leaves or goes out on leave.

Fractional HR tends to fit when HR has outgrown the owner, or one stretched HR person, and a full-time hire is still a bigger step than the business is ready for.

If you’re hiring an individual consultant for either outsourced or fractional work, ask what happens when they’re at capacity, on vacation, or facing a problem outside their specialty. Also ask whether specialist work, like compensation or investigations, costs extra.

What PEOs, ASOs, and Fractional HR Cost

Almost every published price in this market comes from a company selling the service, so treat the ranges below as a starting point and get quotes.

Model	How it’s usually priced	Typical range
PEO	Percentage of payroll, or a flat fee per employee	Roughly 2% to 15% of payroll, according to the U.S. Chamber of Commerce. Benefits premiums are often billed on top.
ASO	Per employee per month	Roughly $50 to $250 per employee per month (U.S. Chamber of Commerce)
Outsourced HR	By project, by the hour, or a monthly retainer	Depends on scope.
Fractional HR	A monthly fee for a set block of hours	Commonly a few thousand dollars a month.
Full-time HR hire	Salary plus benefits	In Massachusetts, the median HR specialist earned about $86,000 and the median HR manager about $182,000 in May 2025, before benefits (Bureau of Labor Statistics). Pay runs lower in Maine, New Hampshire, and Vermont.

The bigger difference is how each price changes as you grow. PEO and ASO fees scale with headcount or payroll, so they climb with every hire and every raise. A fractional or outsourced engagement is priced on the work, so the cost holds steady until your needs change.

At around 20 employees, a PEO’s fees and a part-time HR partner often cost about the same. By 100 employees, per-employee pricing has usually pulled well ahead, though the PEO is also running payroll and benefits for that money. Price the administration you need and the expertise you need separately before you compare bundles.

How New England Rules Change the PEO vs ASO Decision

Most PEO and ASO comparisons are written for a national audience, and a few standard selling points work differently here.

Your unemployment rate usually stays your own

PEOs often pitch lower state unemployment taxes through their pooled rate. In Massachusetts, Connecticut, Rhode Island, Vermont, and Maine, the PEO reports unemployment under your account and your experience rate. Connecticut’s Department of Labor says it “does not recognize co-employment” for unemployment tax (CT DOL employer guide). Maine adopted the same approach on January 1, 2026. New Hampshire has been the exception.

Health insurance savings depend on your state

PEOs often promise better health insurance pricing through their large group. Whether a small New England employer gets that pricing depends on the state:

• Maine doesn’t allow PEOs to put small clients on large-group plans. State law rates them as small groups.
• Connecticut allows large-group pricing only when the PEO is fully integrated with the client (Insurance Department bulletin).
• Massachusetts hadn’t taken a position as of early 2025, according to a Maryland Insurance Administration study.

In Massachusetts, Blue Cross Blue Shield is ending its PPO and EPO plans for small groups after 2026 and pointing employers that want PPO access to its PEO partner, according to Becker’s. If a PEO is offered as the way to keep a PPO network, compare the full cost of the arrangement with a broker’s standalone quotes.

Check the PEO’s state license

Every New England state requires PEOs to register or be licensed. New Hampshire can also fine a client that uses an unlicensed PEO, up to $1,000 per employee per day under RSA 277-B:12. Ask for proof of registration in every state where you have employees.

Whichever model you choose, state paid leave filings mostly remain your responsibility, so get the provider’s filing duties in writing. Multi-state teams raise the stakes. Deciding what pay range to post for a role that spans two states, or whether a remote hire in Rhode Island changes your handbook, takes someone who knows the rules where your people work.

Six-state quick reference

State	Unemployment under a PEO	PEO health plan pricing	State paid leave
Massachusetts	Your account and rate	No state position on PEO plans	PFML, mandatory
Connecticut	Your account and rate	Large-group pricing only with full integration	CT Paid Leave, mandatory
Rhode Island	Your account and rate	No specific state rule	TDI/TCI, mandatory; you’re the employer
Maine	Your account and rate (since Jan. 2026)	Small clients rated as small groups	PFML, mandatory; you’re the employer
New Hampshire	The PEO’s account	No specific state rule	Voluntary program
Vermont	Your experience rate	No specific state rule	Voluntary program

Confirm current requirements with the state agency or your HR adviser before you sign anything.

Which HR Model Fits Your Situation

If this sounds like you	Start by looking at
Under 25 employees, no HR person, no benefits broker, and you want one bill	A PEO can work well. Check the license and the renewal history.
Your payroll works fine, but nobody on staff knows how to handle a serious employee issue	Outsourced HR or fractional HR
You have one HR person, and they’re buried	Fractional HR or project support alongside them
Your HR person just gave notice	Interim fractional coverage while you decide what to hire for
Your PEO renewal just jumped	Standalone quotes from a broker, plus the HR expertise you’d need to replace
You have employees in several New England states	Any model, as long as your provider knows each state’s rules

Many growing employers end up using two models at once: a payroll provider or ASO for the administration, plus a fractional or outsourced HR partner for the people decisions. A PEO client might still bring in an outside investigator when a serious complaint comes in.

Frequently Asked Questions

Can I keep my payroll provider and just add HR help?

Yes. Outsourced HR and fractional HR both work alongside the payroll provider you already have. Many ASOs and PEOs require you to move payroll to them, so ask before you sign.

Can I keep my benefits broker?

With an ASO, usually. With a PEO, your benefits typically move to the PEO’s plans, though some PEOs work with outside brokers. Outsourced and fractional HR leave your benefits as they are.

Is a PEO cheaper than hiring an HR person?

Often, at smaller sizes. They also do different jobs. A PEO handles administration, while an HR hire or a fractional HR partner handles the people decisions.

What’s the difference between outsourced HR and fractional HR?

Outsourced HR usually means an outside team takes on HR work, by project or ongoing. Fractional HR means a named HR professional joins your team for a set number of hours each month. Many engagements start as one and turn into the other.

Where EANE Fits

RightFit HR is EANE’s HR consulting practice. We work with employers across New England by project, with ongoing monthly support, or with fractional and interim coverage. Every engagement comes with a dedicated HR Business Partner, backed by in-house specialists in compliance, compensation, employee relations, and recruiting.

We don’t process payroll, sell insurance, or act as a PEO, so your employees, payroll provider, and broker stay where they are. You don’t have to be an EANE member to work with us.

Not sure which model fits? Your EANE team is happy to talk it through. Learn more about outsourced HR and fractional HR through RightFit HR, or call us at 877.662.6444.