Caleb is a resident of the fictional state of Vernetticut. Vernetticut begins its income tax calculation with federal adjusted gross income. Caleb may need to make an addition on his Vernetticut return if he:

Received income that is taxable at the federal level but not at the Vernetticut level.

Claimed a deduction allowed at the federal level but not allowed on the Vernetticut return.

Received income exempt from both federal and Vernetticut income tax.

Incurred an expense that is deductible at both the federal and state levels