What is an ASO?


Sep 25, 2023

Looking to outsource day-to-day human resources tasks to free up more time to focus on your business? Then you may want to enlist the help of an ASO. A firm that offers ASO—or administrative services only—plans handles HR and benefits administration, regulatory compliance, and payroll services support for you without becoming your “co-employer” and taking on legal liability.

In this guide, we’ll dive into administrative services only firms and explain the differences between ASOs and PEOs, when to use an ASO, and more.

What is an Administrative Services Organization?

An ASO—which usually stands for “administrative services organization” but is sometimes written as “administrative services only” or “administrative services offering”—oversees the administration of day-to-day HR tasks. For instance, it can help with local payroll tax account creation and administration, claims support, and state-mandated trainings. In addition to a suite of HR services, ASOs also offer guidance on employment laws, assist with employee relations, and help ensure companies remain in compliance with federal, state, and local laws. 

ASOs also often help businesses arrange workers’ compensation and employee benefits coverage, but it’s important to note that they don’t actually sponsor these plans. The health benefits, life insurance, and other employee benefits offered will still be sponsored by the client company itself. 

Administrative services organizations have a wide variety of advantages for business owners, including peace of mind that they are following the proper rules and regulations and thus mitigating risks. They can also help save on costs—it’s frequently less expensive to hire an ASO than it is to build an internal HR team to perform the same functions. 

You can optimize your company’s workflow by outsourcing your critical administrative tasks to the team at Rippling.

ASO vs. PEO: What’s the difference?

So now, you might be saying to yourself, “ASOs sound a lot like PEOs.” And while both administrative services organizations and professional employer organizations (PEOs) offer HR outsourcing services, there’s a major distinction between the two. Unlike ASOs, when you work with a PEO, the firm becomes a co-employer of your team. But what exactly does this mean?

Under a co-employment model, two companies make a contractual arrangement in which they share some of the responsibilities and obligations that come with being an employer. The PEO takes on administrative functions, such as securing large group health plans and other employee benefits—and even remits taxes for you under its own federal EIN. In a co-employment relationship, the business owner remains the “worksite” employer and continues to oversee the day-to-day operations of your company, manage the work of employees, decide who to hire or terminate, and handle marketing, sales, product development, and the business’s strategy and operations.

Whether you select an ASO or PEO depends entirely on your budget and business needs. An ASO arrangement might be right for you if you’re seeking help creating and managing local payroll tax accounts and want human resources support with a personal touch, but don’t want to take on a co-employer. Seeking benefits and HR support from an organization that will absorb some of the risk that goes along with operating a company? A PEO may be a better choice. 

Below, you’ll find a table that compares ASO plans with PEO plans. And, in the next section, we’ll go over some more factors you should consider when deciding if a PEO or an ASO is right for your business.



Employment model

No co-employment. Your business remains the sole employer.

A PEO becomes a co-employer with your business, sharing many employment responsibilities with you.

Industry restrictions

ASOs do not have any industry restrictions.

PEOs have industry-specific restrictions.

Eligibility requirements

There are no minimum eligibility requirements.

You’ll need a minimum number of employees to contract with a PEO. The exact number of employees and the number who will need to enroll in the health benefits offered by the PEO or a third-party vendor they contract with may differ.

Access to benefits

An ASO does not provide access to benefits but rather works with your existing benefits setup—which most companies secure through a broker.

A PEO chooses, arranges access to, and sponsors health benefit plans and other employee benefit plans.

Workers’ compensation

ASOs do not offer workers’ compensation, but they may help arrange access to it.

PEOs do provide workers’ compensation benefits.

Payroll tax account management

All local and state payroll tax accounts are created and managed by the ASO.

All state and local tax accounts are created and managed by the PEO.

Employment practices liability insurance (EPLI)

ASOs provide EPLI.

PEOs provide EPLI.

Live HR support

ASOs offer live HR support services.

PEOs offer live HR support services.

Claims support

ASOs provide unemployment and employment practices liability (EPL) claims support services, but you’ll have to contact the insurance company you purchase workers’ comp from to process claims and receive support.

PEOs offer EPL, workers’ compensation, and unemployment claims support.

Compliance support

ASOs provide support with regulatory compliance.

PEOs provide support with regulatory compliance.

From HR administrative help to state and local payroll tax account creation and management to claims support, Rippling provides companies—small and large— with ASO and PEO services. In fact, Rippling is the only provider that allows you to easily move between its ASO and PEO services to keep up with your changing business needs as you grow. Best of all, if you do move between ASO and PEO, you won’t need to replace and implement a new workforce management system.

When to use an ASO vs. PEO

Now that you know some of the differences between PEO and ASO plans, it’s time to determine if an ASO arrangement could be the right fit for your business. Before you make a decision, you need to consider factors like the HR services you require, risk absorption, your company’s budget, and the employee benefits you’re looking for. We’ll go over each of these factors in more detail below.


While some ASOs can facilitate introductions with brokers, your company will ultimately need to secure your insurance plans. ASOs don’t sponsor any benefits: the financial responsibility for the benefits package belongs to the business.

A PEO, on the other hand, offers benefits—however, you’re limited to the benefits choices the firm provides. In terms of benefits, PEOs come with two big upsides: they will provide and sponsor the benefits package for you, and they tend to provide cheaper insurance premiums and access to more attractive health group plans.

HR services

Both PEOs and ASOs provide HR services, but these differ in scope. Both run payroll, ensure regulatory compliance, manage state and local taxes, and so on, but ASOs are more limited in that their main function is to oversee the day-to-day administrative aspects of a company’s human resources functions. PEOs offer a broader suite of services, such as paying taxes for you under their own EIN and sponsoring health insurance and other employee benefits. 


Overall, ASO plans tend to be less expensive than PEOs. Usually, ASO offerings charge a flat fee per employee, whereas the pricing model a PEO uses can either be a flat or a variable fee that’s a percentage of your payroll. If you're looking for some HR admin assistance on a budget, an ASO might be a good compromise.


As a co-employer, a PEO will assume some of the risk you incur in the course of running a business. This can be great news for small business owners in particular, who may be concerned about the amount of risk they’re taking on and nervous about the possibilities of high legal fees and costly claims. On the other hand, since ASOs don’t operate under the co-employment model, they don’t take on any risk when they work with you.

The big takeaway: small businesses that are conscious of costs and don’t need sponsored benefits packages find ASO plans to be the better option, while businesses that want a full suite of HR services and benefits—and a partner to absorb some risk—are often happier with a PEO.

Automate your HR and compliance needs with Rippling ASO

Managing all the tasks that come with running a company can be a daunting feat. With the ASO plan from Rippling, you’ll have support navigating things like state-mandated short- and long-term disability, employee grievances, the creation and management of state and local tax withholding accounts, and much more, so you can rest assured you’re in compliance. 

Rippling ASO makes it easy to hire a remote team, comply with labor laws, automate compliance training, create and edit your employee handbook, and receive support from human resources experts.

Rippling and its affiliates do not provide tax, accounting, or legal advice. This material has been prepared for informational purposes only, and is not intended to provide, and should not be relied on for, tax, legal, or accounting advice. You should consult your own tax, legal, and accounting advisors before engaging in any related activities or transactions.

last edited: September 25, 2023

The Author

Carrie Stemke

A freelance writer and editor based in New York City, Carrie writes about HR trends and global workforce management and is the Rippling content team’s expert on hiring know-how in Western Europe.