ASO (administrative services organization)
An administrative services organization (ASO) performs payroll, HR, and benefits administration for a business under the business’s own EIN, without co-employment.
You stay the sole employer and the taxpayer of record, and filings are made under your EINEIN (Employer Identification Number). An EIN, or Employer Identification Number, is the nine-digit federal tax ID the IRS assigns to a business, in the format XX-XXXXXXX.Click to open the term. An ASO delivers services under a contract and does not take on the employment relationship itself. The service agreement states which tasks it performs and which decisions stay with you, so confirm that split in writing. A payroll service bureauPayroll service bureau. A payroll service bureau calculates payroll, produces pay statements, and files and deposits employment taxes for employers under each employer’s own EIN.Click to open the term overlaps with an ASO but concentrates on payroll processing and tax filing. Providers use both terms differently, so compare the actual service schedules rather than the labels.
How does an ASO differ from a PEO?
The difference sits in who is employer of recordEmployer of record (EOR). An employer of record (EOR) is an organization that becomes the legal employer of a client business’s employees, while the client directs the daily work.Click to open the term. Both models serve real needs. The choice generally turns on how much employment responsibility you want to retain and what benefits access you need. How your insurance and risk program is structured matters too. Responsibility follows the actual payer or agent arrangement documented in the agreement, so read the agreement rather than the brochure label. A mid-year move between the two typically means employees receive a separate Form W-2Form W-2. Form W-2 is the annual wage and tax statement you give employees and file with the Social Security Administration, reporting wages paid and taxes withheld.Click to open the term from each EIN.
| QUESTION | ASO | PEO |
|---|---|---|
| Co-employment | None | Established |
| Taxpayer of record | You, as sole employer | Certain employment tax and reporting obligations can sit with the PEO |
| EIN on payroll reporting | Your own | Usually the PEO’s |
| Contract | A service agreement for administrative work | States responsibilities per employer and per obligation |
- Third party arrangement chart
- Third party payer arrangements: Payroll service providers and reporting agents
General information, not legal or tax advice. Apply current federal and state rules with qualified guidance.