On the Map - Corporate Taxes
Many states with corporate income taxes include some amount of federally defined Global Intangible Low-Taxed Income (GILTI) in their tax bases. Twenty-one states plus D.C. include some amount of GILTI in their tax calculations in 2025.
Revenue Effect of Mandatory Worldwide Combined Reporting by State
February 21, 2025 • By ITEP Staff
Universal adoption of mandatory worldwide combined reporting (WWCR) in states with corporate income taxes would boost state tax revenue by $18.7 billion per year. The revenue effects of mandatory WWCR would vary across states. We estimate that 38 states and the District of Columbia would experience revenue increases totaling $19.1 billion. The top 10 states […]
Corporate Income Tax Filing Methods: States with Water’s Edge or Worldwide Combined Reporting
February 21, 2025 • By ITEP Staff
The purpose of state corporate income taxes is to tax the profit, or net income, an incorporated business earns in each state. Ascertaining the state where profits are earned is, however, complicated for companies that conduct business in multiple jurisdictions. Twenty-eight states plus D.C. now require a limited version of combined reporting called “water’s edge” […]
In recent years, lawmakers have been quick to push for phased-in tax cuts or cuts attached to trigger mechanisms. These policy tools push the implementation of tax cuts outside of the current budget window with a predetermined phase-in schedule or a mathematical formula tied to state revenue trends.
"Combined reporting" lessens the effectiveness of a tax avoidance scheme known as income shifting, in which large multi-state corporations dubiously claim that their income was earned in states with little or no corporate income tax.
Corporate income taxes are an important source of revenue for state governments and ensure that profitable corporations benefiting from public services pay toward the maintenance of those services.
Map Categories
Institute on Taxation
and Economic Policy
ITEP is a non-profit, non-partisan tax policy organization. We conduct rigorous analyses of tax and economic proposals and provide data-driven recommendations to shape equitable and sustainable tax systems.
Subscribe to ITEP Emails
Tax research and policy news in your inbox.
Promote Fair Tax Policy
Your gift to ITEP promotes tax justice. With your help, we do research that supports taxing millionaires and billionaires, taxing big corporations and raising revenue for the things our people, our communities and our planet need.
Together, we can create a country with more economic justice, more racial justice, more climate justice… and more tax justice.