
Idaho HB 559: Why 100% Bonus Depreciation Won't Apply on Your State Return
Idaho's HB 559, signed February 10, 2026, conforms to the OBBBA's expanded $2.5 million Section 179 cap but decouples from 100% bonus depreciation under Section 168(k), new Section 168(n) qualified production property expensing, and R&E transition relief — a divergence projected to cost Idaho businesses about $151 million in 2026. Here's who it hits and how the Form DBDA addback works.










