Creating a sales and use tax remittance program for affordable housing.

SB 5591 creates a local sales and use tax reimbursement program for developers building affordable housing projects. It allows cities or counties to adopt programs that reimburse developers for sales taxes paid on construction materials, provided the project includes at least 50% units affordable to low-income households (costing ≤30-38% of income) for 40 years. Developers must apply to local governments, meet strict affordability and timeline requirements (completion within 3 years), and maintain affordability for the full 40-year period. The program applies only to projects meeting Washington’s defined "affordable housing" standards and requires local government approval before implementation.