The Center on Budget and Policy Priorities recently released a very useful report summarizing tax expenditure reporting practices in the states, as well as methods for improving a typical state's tax expenditure report. For those unfamiliar with the term, a "tax expenditure" is essentially a special tax break designed to encourage a particular activity or reward a particular group of taxpayers. Although tax expenditures can in some cases be an effective means of accomplishing worthwhile goals, they are also frequently enacted only to satisfy a particular political constituency, or to allow policymakers to "take action" on an issue while simultaneously being able to reap the political benefits associated with cutting taxes.
Tax expenditure reports are the primary means by which states (and the federal government) keep track of these provisions. Unfortunately, most if not all of these reports are plagued by a variety of inadequacies, such as failing to consider entire groups of tax expenditures, or not providing frequent and accurate revenue estimates for these often costly provisions. Shockingly, the CBPP found that nine states publish no tax expenditure report at all. Those nine states Alabama, Alaska, Georgia, Indiana, Nevada, New Jersey, New Mexico, South Dakota, and Wyoming, undoubtedly have the most work to do on this issue. All states, however, have substantial room for improvement in their tax expenditure reporting practices.
For a brief overview of tax expenditure reports and the tax expenditure concept more generally, check out this ITEP Policy Brief.