WA HB1375

Increases Washington's estate tax exclusion amount from $2,193,000 to $2,959,000 for decedents dying on or after August 1, 2025

Establishes annual inflation adjustments beginning in calendar year 2026, using the Seattle-area consumer price index with October 2024 as the new baseline

Updates the inflation adjustment formula to multiply $2,959,000 (rather than the previous $2,000,000) by the percentage change in the consumer price index

Simplifies the geographic reference for the consumer price index from "Seattle-Tacoma-Bremerton metropolitan area" to the "Seattle area" geographic sample

Takes effect August 1, 2025