Kennewick, Washington Sales Tax Rate

Agriculture, healthcare, retail, and energy drive Kennewick's economy. The city is part of the Tri-Cities region along with Pasco and Richland. Major employers include healthcare systems, agriculture processing, and the Hanford nuclear site nearby.

The combined sales tax rate in Kennewick is 8.800%, composed of the Washington state rate of 6.500% plus a local portion of 2.300%. On a receipt, that stacks up as: State 6.5% + Benton County 0.5% + City of Kennewick 1.8% = 8.8%.

The formula to calculate sales tax for any purchase:

For a $150.00 purchase in Kennewick: tax is $13.20 ($150.00 × 0.08800), total is $163.20.

Kennewick's agriculture and healthcare sector buys exactly the goods Washington treats specially:

• Prescription Drugs: Exempt when prescribed by a licensed practitioner
• Medical Devices: Varies — often exempt when sold to licensed facility
• Prosthetics & Orthotics: Generally exempt when prescribed
• Oxygen & Respiratory Equipment: Typically exempt for home medical use
• Diabetic Supplies: Test strips, insulin pumps, glucose monitors — generally exempt

Where an item does not qualify, the full 8.800% combined rate applies in Benton County.

For providers in Kennewick, entity status decides what the purchasing department owes:

A non-profit hospital is generally relieved of tax on purchases made for its exempt purpose, and a for-profit one on the same street is not — so the entity classification decides the invoice before the item does. The line is not the building: the gift shop, the cafeteria and the parking structure are unrelated business activities and can be taxable at 8.800% inside an otherwise exempt institution, while capital equipment on the scale of an MRI or a surgical robot usually is exempt with the documentation in place. Contracted laundry, food service and medical waste each follow their own Washington treatment. The certificate mechanics are in the exemption certificate guide.

Life-sciences work in Kennewick can tap:

• R&D Tax Credits: Federal (up to 20% of QREs); many states add their own — verify Washington's current program
• Equipment Exemptions: Lab equipment used in qualified research often exempt
• Clinical Trial Materials: Drugs/devices used in FDA-approved trials often exempt
• Orphan Drug Credits: Federal credit for rare disease drug development

Kennewick shoppers and businesses routinely cross into Pasco, Richland, Yakima and beyond — and in Washington, the combined rate can change at those lines. Of the tracked neighbors, Pasco charges 8.900%, Yakima charges 8.500% and Spokane charges 9.100% versus Kennewick's 8.800%.

• Pasco (5 mi): combined rate 8.900% — see the Pasco page
• Richland (8 mi): combined rate 8.800% — see the Richland page
• Yakima (70 mi): combined rate 8.500% — see the Yakima page
• Spokane (150 mi): combined rate 9.100% — see the Spokane page

Deliveries are taxed by the destination rules Washington applies, not by where the store sits — when an order ships across one of these city lines, re-check the rate for the exact address.

Since South Dakota v. Wayfair, a seller with no premises, staff or stock anywhere near Kennewick can still be required to register in Washington and charge 8.800% on what it ships here — presence stopped being the trigger and volume took over. The thresholds that decide it are in the table below; what they do not tell you is that crossing them obliges you to collect at the buyer's local rate, not a state average, which is why Kennewick and its neighbours have to be priced separately. The registration mechanics and the trailing-twelve-month counting rules are in the economic nexus guide.

Audit & Compliance Warning: Because combined tax rates combine state and local tax components, calculating tax based purely on ZIP codes can lead to errors. Many ZIP codes span multiple municipal boundaries with differing rates. For precise auditing, always use address-level geo-lookup.

Three obligations follow the 8.800% rate around Kennewick: untaxed out-of-state purchases delivered here owe matching use tax — $88.00 on a $1,000 order — self-assessed to WA Dept of Revenue / Benton County; sellers with physical presence or economic nexus must register before collecting; and wholesale sales need a valid resale certificate on file at transaction time. Filing mechanics, exemption certificates, and audit preparation are covered in the Washington sales tax guide.

Kennewick has significant retail activity. Marketplace facilitator laws require platforms to collect/remit sales tax for third-party sellers. Economic nexus threshold in Washington: $100,000 in gross sales, revenue-only with no transaction test, measured over the current or previous calendar year..

Kennewick's energy sector may qualify for equipment exemptions on drilling, production, pipeline, and renewable energy equipment. Federal ITC/PTC credits also available for qualified projects.