Henderson gives an example of a tax expenditure. He describes a person who deducts mortgage interest, and in doing so causes his federal income tax to be less than what it would be without the deduction. The reduction in tax liability due to the deduction is a tax expenditure. In that, he is correct.
Henderson then asks, “Why do they call it a tax expenditure?” His answer is wrong. He claims that the term “tax expenditure” rests on the “implicit assumption . . . that there shouldn’t be a deduction for home mortgages.”
Why is he wrong? Let’s step back. There are two ways that the federal government can move money into the private sector. One is a direct expenditure. A direct expenditure is the delivery of a check, an electronic fund transfer, or the delivery of some sort of prepaid card. The other way is to shift money by providing an income tax exclusion, a deduction, or a credit to a taxpayer. A technically precise term for that sort of expenditure would be “expenditure accomplished through the tax system.” Another technically precise term would be “expenditure accomplished through providing an income tax exclusion, deduction, or credit.” Both of those technically precise terms are mouthfuls and make it difficult to speak, to understand when listening, to write, or to read because they clutter sentences and paragraphs. So as shorthand for those technically precise, but verbose, terms people speaking about tax policy and government spending shortened the term to its two most important words, tax and expenditure.
Henderson, proceeding on his claim that the term “tax expenditure” is used to describe exclusions, deductions, and credits that should not exist, says that instead of using the term policymakers and those discussing policy should simply state that “the deduction is bad policy.” But this demonstrates the flaw in Henderson’s position. At present, EVERY exclusion, deduction, and credit is classified as a tax expenditure because EVERY exclusion, deduction, and credit has the same effect of reducing tax liability. According to Henderson’s method of reasoning, because anything termed a “tax expenditure” is something that policymakers and those discussing policy should simply describe as “bad policy,” logic mandates that every tax expenditure, that is, every exclusion, deduction, and credit is “bad policy.” That surely is not the case.
A tax expenditure is nothing more than an equivalent of a direct expenditure. For example, instead of providing a deduction for mortgage interest, the federal government could provide a direct cash subsidy to the homeowner. Currently, the amount of that subsidy would be measured by the homeowner’s tax status. Whether there should be subsidy, however paid or measured, is a different issue than the terminology used to describe one way of providing that subsidy. Tax has a language all its own. Tax expenditure is a term that is part of that language. Calling something a tax expenditure is not, in and of itself, an evaluation of the wisdom of the tax provision causing the tax expenditure.