The 2017 federal Tax Cuts and Jobs Act made significant changes to federal tax laws. Generally, the federal tax changes reduced tax rates and broadened the tax base (what is subject to tax). Because the state’s income tax laws closely refer to large portions of federal law, many of those changes created new differences between federal and state taxes. State law currently does not adopt—or conform to—any of the federal changes made in 2017. This report assesses the arguments for and against conforming to ten of those major changes. (Five of these conformity provisions are included in the Governor's proposal.)