The sales tax rate in SeaTac, Washington is 10.1%, applied to most retail purchases inside the city. That figure combines Washington’s 6.5% statewide retail sales tax with 3.6% in local taxes shared among King County, the city of SeaTac, and regional transit. Because Washington has no state income tax, sales tax is the main way state and local government revenue gets raised, and SeaTac’s combined rate sits among the higher ones in the Puget Sound region.
How the 10.1% Breaks Down
The foundation is Washington’s statewide retail sales tax of 6.5%, which applies uniformly on qualifying retail sales across the state.1Washington State Legislature. RCW 82.08.020 – Tax Imposed Local governments stack another 3.6% on top.
The largest local piece is the Regional Transit Authority tax of 1.4%, which funds Sound Transit. The rest is split among King County general operations, the city of SeaTac, a 0.1% criminal justice component, and a 0.1% mental health and chemical dependency component. Retailers collect the full combined rate at the register and send the money to the Washington Department of Revenue, which then distributes each portion to the appropriate jurisdiction.2Washington Department of Revenue. Retail Sales Tax
Local rate components can change. Before a large purchase, confirm the current rate through the Department of Revenue’s rate lookup tool. The department publishes updated tables each quarter.3Washington Department of Revenue. Local Sales and Use Tax
What the Rate Applies To
Washington’s sales tax reaches most tangible goods you’d buy at a store: furniture, electronics, clothing, appliances, building materials, and similar items. It also covers digital products such as downloaded music, movies, e-books, and software subscriptions. Service charges for repairing, cleaning, installing, or improving personal property are taxable, and so are construction and landscaping services.2Washington Department of Revenue. Retail Sales Tax
The major exemptions cover everyday necessities. Food and food ingredients sold for home preparation are exempt from sales tax under Washington law, which covers staples like bread, dairy, produce, meat, and frozen ingredients. The exemption does not extend to prepared food, soft drinks, bottled water, or dietary supplements. Alcohol, tobacco, and cannabis products stay fully taxable.4Washington State Legislature. RCW 82.08.0293 – Exemptions, Food and Food Ingredients
Prescription drugs dispensed by a pharmacist are exempt, as are certain family planning drugs and devices.5Washington State Legislature. RCW 82.08.0281 – Exemptions, Drugs Dispensed Pursuant to Prescription
Groceries vs. Prepared Food
The line between exempt groceries and taxable prepared food catches shoppers more than any other sales tax question. Often the answer depends on how the seller presents the food rather than what the food is. A rotisserie chicken sold hot is taxable. The same chicken sold cold from the deli case may be exempt.6Washington Department of Revenue. When to Charge Sales Tax on a Food Item
The triggers that make food taxable are whether the seller heats it before handing it over, whether the seller provides utensils like a plate, bowl, cup, or fork as part of the sale, and whether the seller mixes two or more ingredients into a single item to order. There are limited exceptions for items sold by weight, cut-and-repackaged products, and items requiring the customer to cook them.
Cars and Trucks
Vehicle purchases carry an additional 0.5% motor vehicle sales tax on top of the standard rate, bringing the effective tax on a car or truck bought in SeaTac to 10.6%. The extra half-percent goes to the state’s multimodal transportation account. The surcharge applies to cars, trucks, and similar highway vehicles, but not to farm tractors, off-road vehicles, or snowmobiles.1Washington State Legislature. RCW 82.08.020 – Tax Imposed
On a $35,000 vehicle, that extra 0.5% adds $175 to the tax bill beyond what the posted 10.1% rate would suggest. Dealers handle the collection, but it helps to know the real number going in.
Which Rate Applies When Something Is Delivered
Washington uses destination-based sourcing. The tax rate charged on a purchase depends on where the buyer receives the goods, not where the seller sits. Order furniture from a Bellevue store and have it delivered to your SeaTac home, and you pay SeaTac’s 10.1% rate. The local portion of the tax goes to SeaTac.7Washington Department of Revenue. Destination-Based Sales Tax Overview
Pick the same item up in person at the store, and you pay that city’s rate instead. For large purchases, even a fraction of a percent can matter.
Online Purchases
Buy something online from an out-of-state retailer, and you’ll almost always pay the full 10.1% SeaTac rate at checkout. Washington requires any remote seller with more than $100,000 in gross receipts sourced to Washington in the current or prior year to register, collect, and remit sales tax.8Washington Department of Revenue. Out of State Businesses Reporting Thresholds and Nexus
Major online marketplaces (Amazon, Walmart, eBay, Etsy) collect Washington sales tax automatically as marketplace facilitators. The platform handles the tax for its third-party sellers, so even a small independent seller operating through one of them will charge the correct local rate. Almost every online purchase now arrives with Washington sales tax already collected.
Use Tax When Sales Tax Wasn’t Charged
Buy something without paying Washington sales tax (typically from a small out-of-state seller, a private party, or while traveling in a state like Oregon that has no sales tax) and you owe use tax at the same combined rate of 10.1%. Use tax exists to prevent revenue loss on purchases that happen outside the normal retail system and to keep local businesses from being undercut.9Washington Department of Revenue. Use Tax
You can report and pay use tax through the Department of Revenue’s My DOR portal. Most people run into this when bringing home a big-ticket item from another state, like a laptop bought in Portland or furniture picked up at an Oregon warehouse.
Penalties for Skipping It
Washington’s penalty structure escalates based on how late the payment is and whether the department has to find the tax on its own. A late payment starts at a 9% penalty, climbs to 19% if it stays unpaid, and can reach 29%. If the department discovers unreported tax obligations, an additional 5% unregistered-taxpayer penalty applies. Intentional evasion carries a 50% penalty on top of the unpaid tax. Interest also accrues, calculated annually using the federal short-term rate plus two percentage points.10Cornell Law Institute. WAC 458-20-228 – Returns, Payments, Penalties, Extensions, Interest
Enforcement on small individual purchases is rare. For businesses, the Department of Revenue cross-references federal income tax filings and depreciation schedules to identify unpaid use tax on equipment and fixed assets.
Extra Taxes Around the Airport
SeaTac sits alongside Seattle-Tacoma International Airport, and travelers face additional charges beyond the standard rate. Rental cars picked up at the airport carry Washington’s state rental car tax, airport concession recovery fees charged by the Port of Seattle, and customer facility charges for the off-site rental car center. Those surcharges stack on top of the regular sales tax and can add a meaningful percentage to a rental bill. Hotel stays near the airport also carry lodging taxes layered on top of the retail sales tax, with the exact combination depending on the property’s location within city and county boundaries.
Retail items bought at airport shops carry the same 10.1% rate as anywhere else in SeaTac. Washington has no sales tax holiday, so there’s no annual window when purchases are temporarily exempt.
Deducting SeaTac Sales Tax Federally
Because Washington has no state income tax, SeaTac residents who itemize can deduct state and local sales tax on their federal return.11Washington Department of Revenue. Income Tax Schedule A asks you to choose sales tax or income tax, and since Washington doesn’t impose an income tax, sales tax is the only option that produces a benefit.
The IRS lets you calculate the deduction using actual receipts or the optional sales tax tables published with the Schedule A instructions. The tables estimate a deduction based on income, family size, and local rate, then let you add sales tax paid on major purchases like vehicles, boats, or building materials. For 2026, the state and local tax (SALT) deduction is capped at $40,400, with the cap phasing down for taxpayers with modified adjusted gross income above $505,000. If you’re fully phased out, the cap drops to $10,000. At a 10.1% rate, the SALT cap matters less for sales tax alone than in high-income-tax states, but SeaTac property owners paying significant property taxes could bump up against it once property tax and sales tax deductions are combined.