Rebates and incentives, Washington
A full sales tax exemption through 2029 and full retail net metering, but no residential property tax exemption, whatever a few guides claim. See your numbers, honestly.
How it works
Step 1
This is a point-of-sale exemption, so your installer should not charge tax on the equipment in the first place. If your quote includes sales tax on hardware, push back before signing. Check the sales tax exemption savings calculator to confirm what you should be saving.
Step 2
Despite some marketing claims, the confirmed statewide exemption only applies to facilities of 10 megawatts or larger, far beyond any residential system. Installing solar will likely be reflected in your assessment like other home improvements.
Step 3
Western Washington's winter production is low enough that oversizing for winter isn't realistic, and summer overproduction can be forfeited at year-end true-up depending on your utility's specific rules. Check your federal ITC status too, since it affects your overall math for 2026 purchases.
This is worth being direct about, since some guides describe a 100% residential property tax exemption or cite RCW 82.16.110 as its legal basis. Reading that statute directly shows it actually defines renewable energy cost recovery incentives and community solar project terms, not a property tax exemption at all. The property tax exemption that genuinely exists in Washington law, under RCW 84.36.680, effective January 1, 2025, applies only to solar and wind generation and storage facilities with a nameplate capacity of at least 10 megawatts, a scale thousands of times larger than any residential rooftop system, aimed squarely at utility-scale projects rather than homeowners. For a typical Washington homeowner, installing solar will generally be reflected in your property's assessed value the way most home improvements are, subject to your specific county assessor's practices and assessment cycle timing. If a guide or a salesperson tells you Washington exempts residential solar from property tax, ask them to point to the specific statute, since the one that's commonly cited does not actually say that. Before you count on any incentive, check the DSIRE database of state incentives for your state's current programs.
Under RCW 82.08.962 and RCW 82.12.962, solar energy systems up to 100 kW are fully exempt from state and local sales and use tax, a provision in effect from July 2019 through December 2029. This is genuinely Washington's strongest state-level financial incentive, and it's a point-of-sale exemption, meaning your installer should not charge you sales tax on the equipment in the first place rather than collecting it and having you seek a refund later. Depending on your local combined sales tax rate, which commonly ranges from about 6.5% to 10.1% around the state, this can save several hundred to well over a thousand dollars on a typical residential system. If your written quote includes sales tax on the hardware, that's worth flagging with your installer before you sign, since it suggests either a misunderstanding of the exemption or an installer unfamiliar with how to apply it correctly.
Washington law requires electric utilities, including Puget Sound Energy, Seattle City Light, and Avista, to make net metering available to eligible customer-generators for systems up to 100 kW AC located on the customer's premises, crediting exported solar at the full retail electricity rate. A small number of older sources describe a minimum compensation at the avoided-cost rate, which is lower than retail, but the more consistent and current picture across sources describes standard 1:1 retail crediting as the norm today. Because Washington's electricity rates are relatively low, driven by the state's hydroelectric-heavy grid, the dollar value of net metering credits here tends to be more modest than in states with higher retail rates, even though the crediting structure itself is favorable. Compare the overall regional picture against a neighboring state with the Oregon incentive estimator or the Idaho incentive estimator.
Washington has no state personal income tax, so there is no mechanism through which a state solar income tax credit could exist. The state's previous Renewable Energy System Incentive Program, which paid ongoing production incentives for systems using Washington-manufactured components, fully expired and has not been reauthorized, though the legislature has discussed a replacement in recent sessions without passing one into law as of 2026. Some individual utilities run their own smaller rebate programs, so it's worth checking with your specific provider, but there is no active statewide cash rebate to plan around. Check your federal ITC status too, since that's the other major piece of the incentive picture that changed for 2026.
With your rebate total in hand, the combined loan and rebate timing tool shows the monthly payment on the amount you still need to borrow.
Questions
No, and this is worth being direct about since sources genuinely conflict. Some guides claim a 100% residential property tax exemption, or cite RCW 82.16.110 as the basis for a 10 kW residential exemption. Reading that statute directly shows it actually addresses renewable energy cost recovery incentives and community solar project definitions, not a property tax exemption. The property tax exemption that does exist in Washington law, under RCW 84.36.680, applies only to solar and wind facilities with a nameplate capacity of 10 megawatts or larger, a utility-scale threshold thousands of times larger than a residential rooftop system. For a typical homeowner, installing solar will be reflected in your property's assessed value like most home improvements, though your county assessor's specific practices can vary, so confirm with your local assessor if you want certainty.
A meaningful amount, and this is Washington's strongest state-level incentive. Under RCW 82.08.962 and RCW 82.12.962, solar energy systems up to 100 kW are fully exempt from state and local sales and use tax, in effect from July 2019 through December 2029. This is a point-of-sale exemption, meaning your installer should not charge sales tax on the equipment in the first place rather than having you file for a refund later. Depending on your local combined sales tax rate, commonly cited between about 6.5% and 10.1% around the state, this can save several hundred to over a thousand dollars on a typical residential system. If your quote includes sales tax on the hardware, ask your installer to correct it rather than assuming you need to seek a refund.
Yes, for investor-owned utilities, which is consistent across sources. Washington law requires electric utilities including Puget Sound Energy, Seattle City Light, and Avista to offer net metering at the full retail rate for systems up to 100 kW AC located on the customer's premises. Some guides describe a minimum compensation at the avoided-cost rate, which is lower than retail, but this appears to reference a different or older framing than the current 1:1 retail crediting most sources describe as standard practice today. Confirm your specific utility's current program terms, since Washington's low, hydroelectric-driven retail rates mean net metering credits are more modest in dollar terms here than in states with higher electricity prices.
No to both. Washington has no state personal income tax, so there is no mechanism for a state solar income tax credit to exist. The state's previous Renewable Energy System Incentive Program, which paid production incentives for systems using Washington-manufactured components, fully expired and has not been reauthorized, though the legislature has discussed a replacement in recent sessions without passing one into law. Some utilities offer their own smaller rebates, so it's worth checking with your specific provider, but there is no active statewide cash rebate as of 2026.
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