Employer of record in Washington State: PEO rules, ESD and L&I accounts and what the client still owns (2026)

Washington State does not license PEOs or "employers of record" as of October 2026. It regulates them through unemployment insurance: under RCW 50.04.298 and 50.12.300, a professional employer organization must register with the Employment Security Department (ESD), make sure each client registers too, and file quarterly reports under each client's own account number and tax rate, and ESD says the client remains responsible for its taxes. A coemployment relationship exists only if a majority of the client's workers, or of a division or work unit, are covered, and a provider that only runs payroll is a "third-party payer," which leaves the client as the employer. Workers' compensation must come from the state fund run by Labor and Industries (L&I).

This page is for a company outside Washington, or a staffing firm, deciding whether to employ someone in Washington through an employer of record (EOR) or PEO, or to register itself. How an EOR, a PEO, a staffing agency and payrolling differ is in what is an employer of record and payrolling services explained; the full state checklist is in hiring employees in Washington; and the RCW 19.31 employment agency license, which covers agencies that charge job seekers, is in staffing agency license in Washington. This page adds the PEO definitions, the ESD and L&I accounts and what stays with you.

Washington employer of record and PEO rules at a glance

Does Washington license or register employer of record companies or PEOs?

It does not license them, but it makes them register for unemployment insurance. We found no Washington statute or agency program that licenses PEOs or EOR providers as of October 2026; the state's employment agency license under RCW 19.31 is aimed at agencies that charge job seekers, as our Washington licensing guide explains. What exists instead is a set of unemployment insurance rules from 2007.

RCW 50.12.300 says a PEO "must register with the department and ensure that its client employers are registered," give ESD each client's name, address, unified business identifier (UBI) and ESD account number, the names and Social Security numbers of the client's officers or owners, and a Washington location where payroll records can be inspected, and "notify the department within thirty days each time it adds or terminates a relationship with a client employer." Each client signs a power of attorney authorizing the PEO to act for it. ESD's PEO page adds: "If a client company does business in Washington, both the PEO and the client company need to register in this state," even if "The PEO is located in another state" or "The client company has no employees in Washington." ESD can remove a PEO's authority to act as coemployer if it substantially fails to comply (RCW 50.12.310).

There is no published list of PEOs. Ask the provider to show its ESD registration, the PEO form it filed for your company and the power of attorney you signed; ESD's tax account management center is listed on its PEO page at 855-829-9243.

Is my employer of record a PEO, a staffing company or a third-party payer?

Washington's definitions sort providers into four boxes, and the box decides who the employer is for unemployment insurance:

• Professional employer organization. Under RCW 50.04.298, a coemployment relationship is "intended to be ongoing rather than temporary or project-specific," and it "exists only if a majority of the employees performing services to a client employer, or to a division or work unit of a client employer, are covered employees." The client keeps "any other right or obligation of an employer that is not specifically allocated" to the PEO.
• Temporary staffing services company. Under RCW 50.04.245, a company that recruits and hires its own employees and assigns them "on a temporary basis" to support a client's workforce or for special projects "is considered the employer." It expressly excludes PEOs and "permanent employee leasing."
• Services referral agency. A non-PEO that offers the services of individuals "to perform specific tasks for a third party"; it is also the employer under RCW 50.04.245.
• Third-party payer. Under RCW 50.04.248, a provider of "administrative, human resource, or payroll administration services" that "does not provide an employment or coemployment relationship." Work for a business that uses one "constitutes employment for the employer," and the third-party payer "is not considered the employer."

So an EOR that employs one person you recruited, for an open-ended role, at a company whose other staff are outside Washington needs to explain which box it is in. If it is not a PEO covering a majority of a division or work unit, and not a temporary staffing company, Washington may treat it as a payroll provider and you as the employer.

Who pays Washington unemployment taxes on an EOR or PEO worker?

The PEO files, but under your account. RCW 50.12.300(6) says the PEO "must file quarterly wage and contribution reports with the department," either in a single electronic report "using the employer account number and tax rate assigned to each client employer by the department," or in separate paper reports for each client. ESD's PEO page states the consequence plainly: "The client company is responsible for all their taxes, including penalties and interest. However, we'll try to collect from the PEO first if there's a problem with the client company's tax report." It also warns that if neither has paid or made payment arrangements by September 30, "the client company will receive a delinquent tax rate for the next year." So in Washington the unemployment experience, the rate and the liability stay with the client even when a PEO does the filing.

Who carries workers' compensation in Washington?

L&I's state fund, whoever the employer is. L&I says "Washington State does not allow private workers' compensation coverage," so a PEO cannot bring a master policy from a private carrier for Washington work; coverage is through the state fund or certified self-insurance. RCW 51.16.060 says a "temporary help company which provides workers on a temporary basis to its customers shall be considered the employer for purposes of reporting and paying premiums," but that "the employer shall be liable for paying premiums and assessments, should the temporary help company fail to pay," and L&I's rule for temporary staffing, WAC 296-17-31027, repeats that the client customer is responsible for unpaid premium.

We found no comparable statute or L&I rule addressing PEOs specifically. Before the start date, ask the provider whose L&I account will report the worker's hours, in which risk class, and whether you need an L&I account of your own; treat a vague answer as a reason to open one.

Which Washington registrations, reports and notices still apply?

• Business license. ESD's PEO page sends both the PEO and the client to the Department of Revenue's business license application, which issues the UBI number ESD asks for. Cities such as Seattle, Tacoma and Spokane have their own licenses.
• Paid Family and Medical Leave and WA Cares. Premiums are reported each quarter. The Paid Leave program's employer agent page, which addresses agents and third-party administrators rather than PEOs by name, says agents report "for individual client accounts" and that "The employer is still responsible for ensuring all employer requirements are met by their agent." Ask the provider whose account the premiums go under.
• Income tax withholding. None; new hires complete the federal W-4 only, as our Washington hiring checklist notes.
• New-hire reporting. Within 20 days to the Washington State Support Registry under RCW 26.23.040; agree which party files.
• Notices at hire. The paid sick leave notice no later than the start of employment under WAC 296-128-755, and notice of the Paid Leave program.
• E-Verify. No state mandate; see E-Verify requirements in Washington.

What does the client company still own in Washington?

Under RCW 50.04.298, the PEO "has only those employer rights and is subject only to those obligations specifically allocated to it," and the client keeps everything else. Washington's hiring rules are among the strictest, and they follow the business that recruits and decides:

• Job postings. Pay ranges and benefits in postings at 15 or more employees; see Washington pay transparency. No pay history questions (salary history ban).
• Criminal history. The Fair Chance Act, amended in 2025, sets when you may ask and what notice you give; see ban the box in Washington and Washington background check laws.
• Interviews and testing. Washington requires all participants' consent to record a private conversation; see Washington recording consent law for interviews. Cannabis hiring limits are in Washington drug testing laws.
• Non-competes. RCW 49.62's pay thresholds and disclosure rules, with a full ban scheduled from June 30, 2027; see Washington non-compete laws.
• Co-employment exposure. Wage and discrimination claims can name both parties; see joint employer liability for staffing agencies.
• Federal payroll taxes. The IRS says a client using a PEO "generally remains responsible" for employment taxes unless the PEO is IRS-certified; see the CPEO public listings.

When is registering your own company in Washington the better route?

More often than in most states, because a PEO arrangement already requires your own business license, your own ESD account and your own unemployment rate. Registering fully adds an L&I account, Paid Leave and WA Cares reporting, the new-hire report and the sick leave notice, with no state withholding. That route tends to win for a single Washington hire or a small team at a company based elsewhere, or when the provider cannot show it is a PEO or a temporary staffing company. A PEO fits a company moving a majority of a team or division onto one provider for payroll, benefits and compliance. A temporary staffing company fits defined, short assignments.

Questions to ask an employer of record or PEO before signing for Washington

1. Are you a PEO under RCW 50.04.298, a temporary staffing services company, or a payroll provider? Does our arrangement cover a majority of a division or work unit?
2. Are you registered with ESD, and will you file the PEO form for our company within 30 days and send us the power of attorney?
3. What are our UBI and ESD account numbers, and will you report under our account and rate?
4. Whose L&I account will report the worker's hours, and in which risk class?
5. Whose Paid Leave and WA Cares account will the premiums go under?
6. Who files the new-hire report and gives the paid sick leave notice?
7. What happens if a quarterly report is wrong or late, given that ESD holds us responsible for the tax?
8. Are you an IRS-certified PEO, and who is liable for federal employment taxes if you miss a deposit?
9. How do we move the worker to our own payroll if we register later?

Employer of record rules in other states: Arizona, Arkansas, California, Colorado, Florida, Hawaii, Massachusetts, Mississippi, Nebraska, New Jersey, New York, Pennsylvania, Rhode Island, South Carolina, Texas and Virginia.