OLYMPIA, WASH. – Customers can benefit from a sales tax exemption on the purchase and installation of qualified solar energy systems.
The exemption covers all sales tax paid on the purchase and installation of solar energy systems that generate up to 100 kilowatts (kW) AC of electricity.
Customers must complete and provide a Buyer’s Retail Sales Tax Exemption Certificate to the seller. Sellers must keep the certificate in their records for five years.
The Washington State residential code requires 3 energy efficiency credits for new home builds up to 1500 square feet, 6 energy credits for homes up to 5,000 square feet and seven credits for homes over 5,000 square feet. The Energy Credit Summary table demonstrates the range of credits that can be achieved in each of the categories. Solar worksheet here page 3 effective March 2024
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