Washington’s mileage reimbursement law does not require employers to pay a specific per-mile rate when you drive your personal vehicle for work. What it does require is that unreimbursed driving costs cannot push your effective pay below the state minimum wage of $17.13 per hour in 2026.1Washington State Department of Labor & Industries. Minimum Wage Most Washington employers default to the 2026 IRS standard business rate of 72.5 cents per mile,2Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile Up 2.5 Cents but nothing in state law forces them to hit that figure.
What State Law Says and How L&I Reads It
WAC 296-126-090 requires employers to cover necessary expenses an employee incurs while performing work duties at the employer’s direction.3Washington State Legislature. WAC 296-126-090 Read plainly, that language sounds like it should cover gas, tires, and general wear when your boss sends you on the road. The Washington Department of Labor and Industries reads it more narrowly. L&I’s guidance page on getting paid states that “reimbursements for fuel, parking fees, tolls, or other purchases made by the employee for the business are benefits given by the business at its own discretion.”4Washington State Department of Labor & Industries. Getting Paid
So there is no Washington statute you can point to that forces your employer to pay a set mileage rate. The real protection sits in wage law, not expense law.
The Minimum Wage Floor Is the Real Protection
Washington’s Minimum Wage Act does not let an employer structure pay so that your effective hourly earnings drop below $17.13 in 2026. Money you spend on gas, oil changes, and tire wear to do your job reduces what you actually take home. If that math drops your effective rate under the state minimum, your employer has a legal problem regardless of what the paycheck says on its face.
Federal law backs this up through the “kickback rule.” Under 29 C.F.R. § 531.35, wages must be paid “finally and unconditionally” or “free and clear.” When an employer requires an employee to cover costs that are primarily for the employer’s benefit, and those costs cut into minimum wage or overtime pay, the employer has violated the Fair Labor Standards Act.5eCFR. Title 29 Section 531.35 The U.S. Department of Labor applies the same principle to any repayment or expense that primarily benefits the employer: it cannot drive wages below the required minimum.6U.S. Department of Labor. Fact Sheet 16 Deductions From Wages for Uniforms and Other Facilities Under the Fair Labor Standards Act
This protection is strongest for workers earning close to minimum wage. A driver paid $18.00 an hour who spends $40 on gas and vehicle costs during an eight-hour shift is effectively earning $13.00, below both the state and federal floor. The employer must reimburse enough to bring the effective rate back above $17.13. Higher-paid employees have more cushion before their pay drops through the floor, but the underlying principle is the same.
The 72.5 Cent Default
Because the state does not set a rate, most Washington employers use the IRS standard business mileage rate, which is 72.5 cents per mile for 2026.2Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents per Mile Up 2.5 Cents The IRS updates the figure each year based on a study of fixed and variable vehicle costs, including depreciation, insurance, fuel, and routine maintenance.
Using it is optional. Some employers pay more, some pay less, and some reimburse actual documented expenses instead. The IRS rate is easy to calculate, hard to challenge as too low, and, when paid through an accountable plan, stays tax-free on both sides. That is why it is the default in most Washington workplaces.
Which Miles Actually Count
Not every mile you drive is reimbursable. The commute-versus-business line trips up more people than any other part of this question.
Driving from home to your regular workplace and back is a commute, and commuting is a personal expense. It stays personal even if you live far away or have no other option. These miles do not qualify for reimbursement under any standard employer policy, and the IRS does not treat them as deductible business travel.
Miles become business miles when you travel at your employer’s direction to somewhere other than your regular workplace. Common examples:
- Driving between job sites during a single shift.
- Picking up supplies, dropping off documents, or visiting a client at the employer’s request.
- Reporting to a satellite office, training facility, or meeting location that is not your usual workplace — the additional distance beyond your normal commute is typically reimbursable.
- Traveling to a temporary work site where you expect to work for less than one year.
How Reimbursement Gets Taxed
Whether mileage reimbursement shows up as taxable income depends on whether your employer runs an accountable plan. Under IRS rules, an accountable plan needs three things: the expense must have a business connection, you must provide adequate documentation like a mileage log within a reasonable time, and you must return any excess reimbursement you did not actually spend.7Internal Revenue Service. Publication 463 Travel Gift and Car Expenses Meet all three and reimbursements up to 72.5 cents per mile are not taxable and do not appear as wages on your W-2.
If your employer pays more than the IRS rate, the excess is treated as taxable wages. And if you get a flat monthly car allowance with no mileage logs or documentation required, the whole thing is taxable because it fails the accountable plan test. That difference adds up over a year of driving.
Records That Hold Up
Documentation decides these cases. A useful mileage log records the date, the start and end locations, the purpose of the trip, and total miles driven. A notes app works. A spreadsheet works. A GPS-based mileage app works better. Keep pay stubs too, because the reimbursement question is really a wage question, and you need both sides of the math.
Filing a Complaint With L&I
If your employer is not reimbursing work-related driving and the shortfall pushes your effective pay below minimum wage, you can file a Worker Rights Complaint with L&I. You can file online, mail the paper form (F700-148-000), or visit an L&I office in person.8Washington State Department of Labor and Industries. Worker Rights Complaints Include your employer’s information, hours worked, total unreimbursed expenses, and any mileage logs or pay stubs that back up the claim.
L&I is directed to complete investigations within 60 days, though the deadline can be extended for good cause. An investigator may contact both you and your employer for evidence, and the agency issues a written determination at the end. One important limit: L&I cannot investigate violations that occurred more than three years before you filed, so do not sit on a claim.9Washington State Legislature. RCW 49.48.083
What Employers Owe When They Get It Wrong
Under RCW 49.52.050, an employer who willfully pays less than what is owed by statute, ordinance, or contract is guilty of a misdemeanor. Civil consequences are steeper. RCW 49.52.070 allows an employee who wins a wage claim to recover twice the amount of unlawfully withheld wages as exemplary damages, plus court costs and reasonable attorney fees.10Washington State Legislature. RCW Chapter 49.52
Double damages change the math. If $3,000 in reimbursements should have been paid to keep wages above the minimum, the employee can potentially recover $6,000 plus legal costs. Washington courts also presume that an employer who refuses to pay owed wages was acting with intent to deprive the employee, which puts the burden on the employer to prove otherwise.