Certified Payroll in Washington State: Prevailing Wage and Reporting Requirements

Washington state has one of the more demanding prevailing wage frameworks in the country. Chapter 39.12 RCW applies to public works contracts with no minimum dollar threshold, which means every contractor and subcontractor on a state or locally funded project must comply, regardless of contract size.

Since January 2020, contractors must submit certified payroll reports at least monthly through L&I's online system. That requirement sits alongside the Statement of Intent to Pay Prevailing Wages and the Affidavit of Wages Paid, creating a three-part compliance obligation that runs from contract award through retainage release.

Who Must Comply

Washington's prevailing wage law covers contractors and subcontractors on public works and building service maintenance contracts funded by state or local government. The scope is broad.

Covered Work

Public works construction, reconstruction, maintenance, and repair are all covered. So is building service maintenance like janitorial work and window washing. Turnkey leases, purchases, and rentals are covered if at least 50% of funding comes from state or municipal sources.

Exemptions

Public employees performing work for their own agency are exempt. Sole proprietors don't owe prevailing wages on their own labor, though their employees are covered. Federally funded projects follow Davis-Bacon, but when both state and federal prevailing wages apply, the contractor pays whichever rate is higher.

Washington's Three-Part Compliance System

The state uses three filings that together create a compliance record from project start to finish. Missing any one of them holds up payments.

Statement of Intent to Pay Prevailing Wages

Filed with L&I after contract award and before work begins. Every subcontractor must also file and have an approved Intent before the awarding agency can make any payments. On contracts over $10,000, the approved Intent must be posted where workers can see it.

Certified Payroll Reports

Since January 1, 2020, all contractors and subcontractors must submit certified payroll to L&I at least monthly through the Prevailing Wage Intent and Affidavit (PWIA) system. Reports must include worker names, classifications, hours worked, actual wages paid, and fringe benefits. Federal projects still require weekly certified payroll submission on top of the state monthly filing.

Affidavit of Wages Paid

Filed after project completion. L&I must approve the Affidavit before the awarding agency can release retainage. Every contractor and subcontractor must have an approved Affidavit on file. One missing sub holds up the entire retainage release.

How Wage Rates Work

Washington's rate structure has details that catch contractors who treat it like a federal Davis-Bacon project.

Rate Determination

L&I sets prevailing wage rates by county and trade classification, based on collective bargaining agreements or wage surveys. Rates include a base hourly wage and a fringe benefit rate.

Rate Updates

Rates update twice per year, on the first business day of February and August, taking effect 30 days after publication. Contractors use the rates in effect on the bid due date. If the award comes more than six months after the bid deadline, rates reset to those on the award date.

Overtime Rules

Overtime requirements in Washington vary by trade and are set in the wage determination. General trades typically require 1.5x after 8 hours per day or 40 per week, with double time for Sundays and holidays. Carpenters, electricians, and elevator constructors each follow different overtime schedules. Always check the wage determination for the specific trade and county.

Fringe Benefits

Fringe benefits include health insurance, pension contributions, vacation pay, holiday pay, and apprenticeship training funds. Taxes and workers' comp premiums are not fringes. The fringe rate in the wage determination is the floor. Contractors must pay at least that amount per hour through a qualifying plan or as cash in lieu.

What Contractors Get Wrong

These are the errors that trigger penalties, hold up retainage, or create back-wage liability.

Filing the Intent Late

The awarding agency cannot legally make any payment until every contractor and sub has an approved Intent on file. Filing late delays your first draw.

Ignoring Subcontractor Filings

Prime contractors must confirm that subs have filed their own Intents and Affidavits. If a sub's Affidavit is missing at project close, the prime's retainage stays locked.

Using the Wrong Rate

Using rates from the wrong county, the wrong trade classification, or an outdated determination is a violation regardless of intent. Rates change twice a year, and a project that spans a rate update must use the correct rate for each period.

Skipping Monthly Certified Payroll

Before 2020, certified payroll submission wasn't required on state projects. Some contractors still treat it as optional. L&I requires monthly filing through PWIA, and non-compliance creates audit exposure.

Penalties

Washington's penalties for prevailing wage violations are substantial.

Civil penalties start at $5,000 or 50% of the violation amount, whichever is greater. Unpaid wages accrue 1% monthly interest. Contractors can be barred from public works bidding until penalties are paid. Willful violations carry criminal penalties. The awarding agency itself faces liability if it knowingly makes payments before Intents are approved.

How Trayd Helps

Trayd's construction payroll platform handles Washington's prevailing wage requirements:

• Wage rates applied by trade, county, and project, with fringe benefit calculations separated from base wages for accurate reporting.

• Certified payroll reports generated from field hours tracked through the foreman app, ready for monthly PWIA submission.

• Multi-state compliance for contractors working across Washington and neighboring states with different prevailing wage frameworks.

Working on public projects in Washington? Schedule a demo.

FAQs

Does Washington have a minimum dollar threshold for prevailing wage?

No. Washington's prevailing wage law under RCW 39.12 applies to all public works and building service maintenance contracts regardless of dollar amount. Every contractor and subcontractor on a covered project must pay prevailing wages.

How often must contractors submit certified payroll in Washington?

At least monthly. Since January 1, 2020, all contractors and subcontractors must submit certified payroll reports through L&I's PWIA system. Federal projects on Washington soil also require weekly certified payroll under Davis-Bacon.

What is the Affidavit of Wages Paid?

It is a form filed with L&I after project completion certifying that all workers were paid prevailing wages. L&I must approve the Affidavit before the awarding agency can release retainage. Every contractor and subcontractor must file one.

How often do Washington prevailing wage rates change?

Rates update twice per year, on the first business day of February and August, taking effect 30 days after publication. Contractors use the rates in effect on the bid due date, unless the award comes more than six months later.

What are the penalties for prevailing wage violations in Washington?

Civil penalties start at $5,000 or 50% of the violation amount, whichever is greater. Unpaid wages accrue 1% monthly interest. Contractors can be barred from public works bidding until penalties are paid, and willful violations may carry criminal penalties.