# Administrative Services Organization

> An Administrative Services Organization (ASO) is an HR outsourcing provider that runs payroll, benefits and HR administration for a client that stays the sole legal employer, with no co-employment and no transfer of employer liability.

An Administrative Services Organization (ASO) takes on the administrative side of employment, payroll processing, tax filing support, benefits administration and HR paperwork, for a company that remains the legal employer of its staff. The client keeps its own tax registration and runs payroll under its own identifier; the ASO operates the process on its behalf.

The defining feature of an ASO is what it does not do. Unlike a Professional Employer Organization (PEO), it does not enter a co-employment relationship, so no employer liability transfers to it. And unlike an Employer of Record (EOR), it cannot act as the legal employer in a country where the client has no entity. The client stays responsible for compliance.

That makes an ASO a fit for companies that already have an entity and staff in a country and want to outsource the administrative load without giving up control or employer status. It is not a route into new markets: hiring where you have no entity calls for an EOR instead.

## How is an ASO different from a PEO?

The key difference is co-employment. A PEO becomes a co-employer, sharing employer responsibilities and liability and filing payroll taxes under its own identifier. An ASO does neither: the client stays the sole legal employer, keeps its own tax registration, and simply hands the administrative work to the provider. Liability does not move.

## Can an ASO help me hire in a country where I have no entity?

No. An ASO only administers employment that already sits with your own legal entity, so it needs you to be an established employer in that country first. To employ someone where you have no entity, you need an Employer of Record, which acts as the local legal employer on your behalf.

## When does an ASO make sense?

An ASO suits an established employer that wants to lift the administrative burden of payroll, benefits and HR without changing who is legally responsible. It works best where you have staff and an entity in place and simply want the paperwork run for you. It does not solve compliance in a new market.

## Key facts

- **PEO vs ASO under US tax law:** A certified PEO files under its own EIN; an ASO client does not (Source: 26 U.S. Code section 7705, verified 2026-07-28)
  Under section 7705 of the US Internal Revenue Code, a certified PEO is treated as the employer of worksite employees and files employment taxes under its own Employer Identification Number. An ASO creates no such arrangement, so the client keeps its own EIN and remains the legal employer.

## ASO vs PEO vs EOR

|  | ASO | PEO | EOR |
| --- | --- | --- | --- |
| Legal employer | Client only | Client and PEO (co-employment) | EOR is sole legal employer |
| Own entity required? | Yes | Yes | No |
| Employer liability transfers? | No | Partly | Yes |
| Works where you have no entity? | No | No | Yes |

## Frequently asked questions

### Does an ASO become my employees' employer?

No. With an ASO you remain the sole legal employer of your staff. The ASO handles administration, payroll runs, benefits and HR paperwork, but it does not co-employ your workers and does not take on employer liability. That responsibility stays entirely with your company.

### What is the difference between an ASO and an EOR?

An ASO administers employment for staff you already employ through your own entity. An Employer of Record is itself the legal employer in a country, letting you hire there without setting up an entity. In short, an ASO supports existing employment; an EOR creates the employment relationship for you.

### Is an ASO cheaper than a PEO?

It can be, because the ASO takes on less. Without co-employment, the ASO carries no employer liability and does not pool your staff for group benefits, so its role is narrower. Pricing varies by provider and scope, so the right comparison is what each model actually covers, not the headline fee alone.

### Can an ASO handle payroll in multiple countries?

Only where you already have a legal entity and are the registered employer in each of those countries. An ASO administers payroll you are legally running yourself. If you want to pay staff in a country where you have no entity, that needs an Employer of Record, not an ASO.

## Sources

- [26 U.S. Code section 7705, Certified professional employer organizations](https://uscode.house.gov/view.xhtml?req=%28title%3A26+section%3A7705+edition%3Aprelim%29), Office of the Law Revision Counsel, US Code
- [Third party payer arrangements, Professional Employer Organizations](https://www.irs.gov/government-entities/third-party-payer-arrangements-professional-employer-organizations), Internal Revenue Service

_Last updated 2026-07-28. Reviewed by Teamed's in-house employment-law team. Source: https://www.teamed.global/glossary/administrative-services-organization_