Treasury's budget is mostly interest on the debt. The program budget is a rounding error beside it.
Office of the Chief Financial Officer · Department of the Treasury
Treasury is unlike any other civilian department. Its reported budget authority is dominated by mandatory, non-program money — above all Interest on the Public Debt, the single largest line in the federal government. That money is kept strictly apart here from Treasury's discretionary program budget — the bureaus, of which the IRS is the bulk. FY2025 actuals, FY2026, and the FY2027 request. The bureau side recomputes to the dollar against its source; interest on the debt is never shown as program spending.
FY2027 interest on the public debt
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mandatory · the single largest line — not program spending
Interest ÷ base discretionary
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interest dwarfs the entire program budget
Interest share of total budget authority
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of total Treasury BA
The discretionary program budget, by bureau group — FY2027 request
$ in thousands · mandatory / interest excludedThe IRS alone is roughly three-quarters of Treasury's discretionary program budget. The base discretionary headline (—) excludes the asset-forfeiture rescission; the all-in Total, Treasury (—) adds the international programs and the forfeiture / international rescissions.