Does Washington tax electricity for charging?

Not with sales tax — Washington embeds its public utility tax in the filed rates and levies no sales tax on electricity. It does tax charging revenue through the business & occupation tax at 0.471% in 2026, stepping to 0.5% in 2027, and it taxes installation labor as part of the hardware sales-tax base under its custom-construction rule.

How much is the Washington clean-fuels credit worth?

The model carries about $0.0184 per kWh in Puget Sound Energy territory at a $25-per-credit marked assumption; Tacoma territory runs higher because its electricity is lower-carbon. The credit standard tightens each year, and the field is editable and re-derives as real credit prices print.

How stable are the modeled Washington rates?

Puget Sound Energy filed a three-year rate case in February 2026, and the figures re-base around early 2027; several adjustment riders also reset each May. Tacoma Power's municipal rates step at its next biennial ordinance, expected around April 2027. The modeled figures carry the current filed rates.

ForgeAsset / Supercharger ROI / Washington

Tesla Supercharger ROI in Washington

Washington is where three tax mechanics the model usually treats as zeros all switch on at once. Electricity itself carries no sales tax — the utility tax is embedded in filed rates — but the state taxes charging revenue through the business & occupation tax, taxes installation labor as part of the sales-tax base under its custom-construction rule, and pays a Clean Fuel Standard credit on every kWh dispensed. Puget Sound Energy serves the Seattle suburbs and Tacoma Power the city of Tacoma; between the rider stacks and the three tax lines, Washington exercises more of the engine at once than any other covered state.

Model a Washington site

What makes Washington economics distinct

The rider stack is most of the energy price

Puget Sound Energy's Schedule 26 prices base energy near 7.6 cents, but ten adjustment schedules — power cost, carbon reduction, conservation, decoupling, and more — fold in to about 11.47 cents per kWh. The demand charge runs about $14.13 per kilowatt-month after a decoupling credit, with no ratchet at secondary voltage. Tacoma Power, a municipal utility, prices energy near 5.8 cents with no rider stack at all.

A tax on charging revenue, stepping up in 2027

Washington's business & occupation tax applies to gross charging receipts. The model carries the retailing classification at 0.471% for 2026, stepping to 0.5% on January 1, 2027 — a revenue-side line that scales with utilization and price rather than a flat fee. The classification of charging revenue is not yet settled in state guidance; if reclassified to a higher category the rate could swing several-fold, so the field is editable.

Installation labor is in the sales-tax base

Under Washington's custom-construction rule the contractor collects retail sales tax on the full contract price — labor as well as hardware. The EVSE exemption that once covered installation labor expired in mid-2025 with no replacement, so at Seattle's 10.55% rate the sales-tax line roughly doubles versus a hardware-only base. The model carries installation labor in the base by default.

A clean-fuels credit that pays the site

Washington's Clean Fuel Standard credits the charging-site owner for every kWh dispensed, the third such live program after California and Oregon. The credit depends on the utility's carbon intensity: the model carries about $0.0184 per kWh in Puget Sound Energy territory at a $25-per-credit marked assumption, with Tacoma territory running higher. The credit standard tightens each year, and the field re-derives as prices print.

Utilities and tariffs modeled in Washington

Utility & tariff	Energy	Demand
Puget Sound Energy Sch 26	11.5¢/kWh flat	$14.13/kW of monthly peak
Tacoma Power Schedule G	5.8¢/kWh flat	$11.39/kW of monthly peak

Rates are digit-verified against each utility's own filed sheets and update within two weeks of any revision. Full derivations are on the methodology page.

Washington tax profile

Sales tax on hardware: 10.55%
Business personal property tax: 0.99% of equipment value (example rate)
Clean-fuels credit: 1.8¢/kWh modeled revenue line
Per-kWh charging excise: none

Washington tax defaults applied: the Clean Fuel Standard credit revenue line is live — carried at about $0.0184 per kWh for Puget Sound Energy territory at a $25-per-credit marked assumption (Tacoma territory runs higher; the field is editable and re-derives as credit prices print). Washington has no income tax; its business & occupation tax applies to gross charging revenue at 0.471% in 2026, stepping to 0.5% in 2027 — carried as the revenue-tax line (the classification of charging revenue is not yet settled in state guidance and the field is editable). Sales tax uses Seattle's 10.55% and, under Washington's custom-construction rule, applies to installation labor as well as hardware — the EVSE labor exemption expired mid-2025. Electricity itself carries no sales tax. Business personal property runs about 0.99% of value per year in Seattle.

Washington programs and incentives

Clean Fuel Standard (Ecology, Chapter 173-424 WAC)

Charging-site owners generate tradeable credits on dispensed energy — the model's revenue line, carried at a per-territory carbon-intensity rate and a $25-per-credit marked assumption until prices print. The credit standard steps down annually, tightening supply.

NEVI (federal, WSDOT-administered)

Federal corridor DC fast-charging funding along I-5, I-90, and I-82, administered in award rounds.

Washington charging market

Washington carries roughly 87 Supercharger stations, concentrated on the Seattle–Tacoma corridor and I-90. Puget Sound Energy serves the Seattle suburbs — Bellevue, Renton, and the Eastside — and Tacoma Power serves the city of Tacoma. Seattle itself is served by Seattle City Light and Everett by a public utility district, neither of which the model covers yet; addresses there see a named-utility notice rather than a wrong auto-selection.

Washington Supercharger ROI — questions

Does Washington tax electricity for charging?: Not with sales tax — Washington embeds its public utility tax in the filed rates and levies no sales tax on electricity. It does tax charging revenue through the business & occupation tax at 0.471% in 2026, stepping to 0.5% in 2027, and it taxes installation labor as part of the hardware sales-tax base under its custom-construction rule.
How much is the Washington clean-fuels credit worth?: The model carries about $0.0184 per kWh in Puget Sound Energy territory at a $25-per-credit marked assumption; Tacoma territory runs higher because its electricity is lower-carbon. The credit standard tightens each year, and the field is editable and re-derives as real credit prices print.
How stable are the modeled Washington rates?: Puget Sound Energy filed a three-year rate case in February 2026, and the figures re-base around early 2027; several adjustment riders also reset each May. Tacoma Power's municipal rates step at its next biennial ordinance, expected around April 2027. The modeled figures carry the current filed rates.

Sources

Model a Tesla V4 Supercharger site in Washington — payback, NPV, IRR, and a 15-year cash flow from your own inputs.

Run a Washington scenario

Other states: California, North Carolina, Georgia, Oregon, Pennsylvania, Florida, Arizona, Texas, Virginia, Illinois, Michigan, Tennessee, Montana, Idaho, Kansas, Nebraska, North Dakota, South Dakota, Wyoming, New Mexico, Oklahoma, Alabama, Missouri, Wisconsin, Iowa, Indiana, Louisiana, Nevada, Ohio, Utah, New Hampshire, Kentucky. Coverage spans thirty-three states in total — see the full list.

ForgeAsset is software, not investment, tax, or legal advice — outputs are model estimates from your inputs, not guarantees. Rates and programs current as of research; verify current terms with each source before committing capital.