State Tax Updates May 2026: California, Idaho, Illinois, Kansas, Kentucky
What are the most important state tax updates for May 2026? Deloitte’s State Tax Matters (Issue 2026-17) highlights five income/franchise developments — California’s agribusiness three-factor apportionment ruling, Idaho’s Supreme Court fiscal-year tax rate decision, Illinois’s intercompany interest addback, Kansas’s GILTI deletion, and Kentucky’s IRC §174A modifications — plus key sales/use updates. For multistate tax teams…