
How Should States Tax Partnership Income? Inside the MTC's Blended Apportionment Proposal
The Multistate Tax Commission's January 2026 white paper proposes a "blended" apportionment method that folds a partnership's sales, property, and payroll factors into each partner's own state tax calculation. Because states currently split between aggregate and entity sourcing theories, the same partnership dollar can be taxed twice — or not at all. Here's what multistate partnerships and multi-member LLCs should track now.










