WA SB6347

Reverses estate tax rate increases enacted in 2025 (c 421 s 202) by restoring the pre-July 2025 tax rate structure effective April 1, 2026

Reduces the top marginal estate tax rate from 35% back to 20% for estates over $9 million

Lowers intermediate tax rates across all brackets; for example, estates between $4-6 million would pay 18% instead of 23%, and estates between $7-9 million would pay 19.5% instead of 30%

Creates a transitional rate structure for decedents dying between July 1, 2025 and April 1, 2026, maintaining the higher rates enacted in 2025 during that period

Amends RCW 83.100.040, which governs the estate tax imposed on transfers of property located in Washington state