Understanding the Three-Factor and Single-Factor Apportionment Formulas for State Taxes
Published on September 21, 2025
Overview of Apportionment and Why It Matters Apportionment is the method by which multistate businesses divide their income among states for corporate income and franchise tax purposes. It determines how much of the company’s overall tax base each state may tax. Although laypeople often view apportionment as a simple percentage calculation, the reality is that