Oregon payroll tax laws: A guide for construction companies

Running compliant payroll in Oregon means juggling state and local obligations on top of federal legislation. Employers must handle their own withholdings, employee contributions, and regular reconciliation reports. In construction, industry-specific regulations like paying prevailing wages and tracking job classifications make the process even more complex.

This article breaks down Oregon payroll taxes for construction companies doing business in the state.

Understanding Oregon payroll taxes in construction

Any construction company working in Oregon needs to comply with state, local, and federal obligations. These mandates apply to every employee working within the state, even if they don’t live there. 

Multiple pay rates for different job classifications, overtime hours, and (when relevant) union and prevailing wages all add a layer of complexity to the construction payroll process. And for contractors working in multiple states, Oregon regulations are only one piece of the puzzle. Having a reliable system in place that handles the tax nuances of every state where work is performed helps protect your business from costly errors.

5 core Oregon payroll tax obligations for employers

Here’s a look at the five main payroll taxes and contributions employers are responsible for in Oregon.

1. State income tax

Unlike its neighbor Washington, Oregon does have income tax. That means employers must withhold and pay (remit) a certain amount of money from each employees’ paycheck. 

Below are the progressive tax rates in Oregon for 2026. This table highlights which tax bracket the employee is in based on their marital status. It also covers the amount employees are taxed for each dollar that falls within that tax bracket:

2. Workers’ Benefit Fund (WBF) tax

The Oregon WBF tax funds return-to-work programs, cost-of-living benefit increases for permanently disabled workers, and surviving family member benefits after a work-related death. This obligation falls on both employers and employees. In total, in 2026, they contribute 1.8 cents per hour worked. Employers must cover at least 0.9 cents but may pay a larger share.

3. State unemployment insurance

The state unemployment insurance program supports laid-off employees, and only employers pay into it. For experienced employes, rates range from 0.9% to 5.4% based on claims history and time in business.

4. Paid leave taxes

Employers and employees must pay into the state’s paid leave program. The total contribution rate is 1% of gross wages per employee, split between employers and employees. Companies with 25 or more employees pay 40% of that rate; employees pay the remaining 60%. Companies with fewer than 25 employees are exempt from the employer portion unless they receive an assistance grant, but they must still withhold and remit the employee contribution.

5. Transit taxes

In 2026, Oregon employees cover a statewide transit tax of 0.1%, and employers make contributions based on a percentage of gross wages. Rates vary by city, ranging from 0.5% in Wilsonville up to 0.8237% for the Portland area’s TriMet system. Note: the Oregon Legislature passed a rate increase to 0.2% effective January 1, 2026, but implementation is on hold pending a voter referendum.

How does income tax withholding work in Oregon?

The Oregon Department of Revenue requires that employers withhold taxes from each employee’s paycheck based on their gross wages and deductions. While the process may differ depending on the company, the basic process looks like this:

• The employee submits an Oregon W-4 (OR-W-4) that lists filing status and other sources of income, such as interests and dividends.
• The employer determines the employee’s gross wages.
• The employer references gross wages, filing status, and payment frequency against Oregon Department of Revenue tables.
• The employer applies the correct withholding tax rate and deducts the amount from the employee’s pay.
• The employer remits taxes on a monthly, quarterly, or annual basis. Several factors affect how often companies must pay. Check the Oregon Combined Payroll Tax Report Booklet for more details.
• The employer files required payroll reports. The Annual Withholding Reconciliation Report is due in January. iWire/Form W-2s and Form 1099s are due in January or March, depending on the form. And quarterly reports are due in January, April, July, and October. Even if companies have no payroll for the quarter, they must file a report. 

Oregon income tax withholding applies to any employee who works on a job located in Oregon, even if they live somewhere else or the company is headquartered out of state. Keep in mind that some areas, like Multnomah and Washington County, tack on additional taxes for high earners. This means employers must withhold an extra amount for workers over a certain wage threshold who work in those locations.

Ongoing requirements for complying with Oregon payroll taxes

Whether contractors are Oregon-based or running a single project in the state, they must satisfy several conditions to stay compliant. Here’s a quick roundup:

• Registering for an Oregon BIN through Revenue Online or by submitting a Combined Employer’s Registration form to the Oregon Department of Revenue
• Filing income tax withholding reports through Revenue Online or by mail
• Filing unemployment and paid leave reports through Frances Online or by mail
• Withholding and remitting the right amount of state and federal income tax for each employee
• Keeping up with WBF contributions to maintain workers’ compensation coverage
• Paying into and withholding taxes for Oregon’s paid leave based on eligibility thresholds and company leave policies
• Paying state unemployment taxes
• Covering state and local transit taxes based on jobsite location
• Filing yearly Oregon Annual Withholding Reconciliation Reports to verify that withheld amounts match remitted amounts for the year

How to calculate Oregon employer payroll taxes

Many companies use construction payroll software to automate payroll, tax, and withholding calculations. For employers who calculate payroll taxes manually, here’s how it works:

• Compile wage and hours worked for each jobsite: The process starts by gathering the necessary details, like gross wages and pre-tax deductions for contributions like retirement plans and healthcare premiums. This stage also includes tracking OR-W-4 details, such as filing status, dependent credits, and any additional withholdings amounts. Teams must track whether employees worked across multiple counties to apply the correct transit tax rates. 
• Determine Oregon taxable wages: The next step is calculating each employee’s state income tax rate based on published withholding tables for the year. This is also where employers include any local income taxes for the jobsite, such as Multnomah County’s PFA tax or Portland Metro’s SHS tax.
• Calculate contributions: Employers account for their contributions, including state unemployment insurance, WBF, and local transit taxes. Then, determine the employee’s contributions toward each applicable program.
• Reconcile totals and confirm net pay: Employers then need to subtract all withholdings to find the final net pay.
• Prepare data for reporting purposes: Finance teams organize the data into the correct format for quarterly and year-end reporting. This typically includes wages, withholdings, and contributions across all jobsites.
• Submit required reports: File the required reports on time.

Keep payroll compliant in every state with Miter.

Calculating Oregon payroll by hand is time-consuming, and the margin for error is real. A miscalculated transit tax rate, an incorrect WBF hour count, or a late certified payroll submission can mean penalties, backpay, or losing your ability to bid on public work.

Payroll software eliminates most of that exposure by automating calculations, flagging filing deadlines, and keeping records organized across employees and jobs. But generic payroll software isn’t built for construction-specific requirements like jobsite-based tax rates, tracking WBF hours from field time entries, or generating the certified payroll reports for prevailing wage jobs.

Miter is. It handles multi-jurisdiction tax calculation based on where work is performed, tracks WBF hours per employee, and generates compliant Oregon-format certified payroll reports ready to upload directly to state portals, all from the same platform your crew uses to log time in the field.

Disclaimer: This article is for informational purposes only and is not intended as tax advice.