The year 2026 marked the first year that most states grappled with implementing the One Big Beautiful Bill Act (OBBBA), the most significant federal tax legislation since 2017. While many state responses were expected, conformity decisions have further widened the gap between state and federal tax treatment, creating one of the most complex and fragmented state tax landscapes in recent memory.
At the same time, states continue to pursue new revenue sources through the expanded taxation of the digital economy and renewed interest in targeted excise and "sin" taxes. This session will review the most significant legislative, policy and administrative developments of 2026 and discuss the key state tax considerations that taxpayers should be monitoring as they prepare for 2027.