True or false: Most states have their own specific definitions of gross and taxable income for tax calculations.

The assertion is true because many states establish their own regulations and definitions when it comes to calculating gross income and taxable income for corporate income tax purposes. Although the federal tax code provides a framework and outlines certain components of income, states often deviate from this framework to reflect local economic conditions, policy goals, and revenue needs. For instance, some states may include specific types of income, deductions, or exemptions that are not recognized at the federal level. This variability can lead to significant differences in tax liability for corporations depending on the state in which they operate. Therefore, understanding the specific definitions and rules in each state is crucial for accurate tax compliance and planning.