What does tax expenditure mean?
Tax expenditure is revenue forgone through exemptions, deductions or deferrals granted relative to a benchmark tax system.
Operation and measurement in public finance
Support is provided through the tax code rather than a direct appropriation. Cost may be estimated as simple revenue forgone or with behavioral responses. The choice of benchmark tax system can significantly change the total. Fiscal analysis extends beyond central government to local authorities, social security and contingent liabilities. Nominal amounts are considered alongside ratios to national income, per-person values and the business cycle. Transparent classification enables comparison.
Policy design, distribution and sustainability
Purpose, duration, beneficiaries and distributional effects are published for each tax expenditure. Permanent exemptions can escape budget review and add complexity. Tax support is compared with direct spending or regulation as alternative ways to reach the same goal. A policy is judged not only by budget cost but also by who benefits, how behavior changes and how it is financed over time. A temporary measure that becomes permanent can narrow future budgets. Independent audit, open data and regular impact evaluation support monitoring.