Source Digest — Tax Policy Center, Tax Expenditures

Status (April 2026): Complete standard digest. One thematic cluster: tax expenditures as the hidden counterpart to direct spending, relevant both to the ratchet debate and to bounded-governance design.

Source identification

Thematic cluster: tax expenditures as hidden spending

Core claims

• "Tax expenditures" are provisions of the tax code (exclusions, deductions, credits, preferential rates, deferrals) that reduce tax liability relative to a benchmark tax system.
• In FY 2024, U.S. federal tax expenditures totaled roughly $1.7 trillion — comparable in magnitude to the entire discretionary budget.
• Tax expenditures are legally structured as tax provisions but functionally equivalent to direct spending in many cases. A mortgage-interest deduction is, economically, a subsidy to housing purchasers financed by foregone revenue.
• The top ten tax expenditures by cost include the exclusion of employer-provided health insurance, the preferential rate on capital gains and qualified dividends, the deduction for mortgage interest, and tax-deferred retirement-account contributions.
• Unlike direct spending, tax expenditures generally are not subject to annual appropriation review, have no sunset clauses in most cases, and do not appear as line items in most budget documents.

Representative statistic

"Tax expenditures were estimated at $1.7 trillion for fiscal year 2024 — similar to the total amount the federal government spent on domestic discretionary programs that year. Tax expenditures effectively represent a significant portion of federal spending that is administered through the tax code rather than through direct outlays."

Research context

Interpretive notes

• Hidden ratchet. Tax expenditures are a second-order ratchet: the stock of preferential tax provisions grows monotonically in most decades because creating a new preference is politically easy and removing an existing one is politically hard. This resembles the Mercatus regulatory-accumulation story.
• Quiet-default design. Unlike direct spending programs, most tax expenditures have no scheduled review, no performance measurement, and no annual reauthorization. They are therefore less reversible than the programs covered in Higgs's analysis, not more.
• Bounded-governance implication. If the project pursues a bounded-governance doctrine (per the Round 1 synthesis), tax expenditures are a canonical target for sunset, review, and reversibility requirements. Their current structure violates nearly every bounded-governance principle the project would plausibly adopt.
• Not partisan. Tax expenditures favor constituencies across the political spectrum: charitable-deduction and mortgage-interest preferences benefit middle- and upper-middle-income households and voluntary-sector institutions; capital-gains preferences benefit investors; EITC and CTC benefit low- and middle-income families. A coherent sunset regime would apply the same discipline to all of them.

Project 2028 mapping

• Exchange: Government Overreach, Ownership as Transition, and the Ratchet Problem. Relevant both to the ratchet question (tax expenditures exhibit an unreviewed accumulation dynamic) and to bounded-governance design (their reform would be a concrete sunset/review test case).
• Problem Map: Domain 4 (Institutional capacity). Tax expenditures illustrate Principle 4's legibility failure directly: a category of fiscal action that is functionally identical to spending but processed through a separate, much-less-scrutinized institutional channel.
• Principles: Direct application of Principle 4 (accountable, legible, reversible power).
• Exchange #14 (Permitting Stack): If the project wants a second forward-motion example alongside permitting, a "tax-expenditure sunset" proposal is a visible bounded-governance demonstration in a policy area with engaged constituencies on both sides.

Cross-references