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Sovereign Debt
Interest Expense to Tax Revenue
Definition
A critical fiscal sustainability metric measuring the percentage of a government's total tax receipts required just to service interest on outstanding debt. It measures the "crowding out" effect where debt service prevents productive spending on infrastructure, defence, or social programs.
Live Intelligence Answer
Current Reading
0.0%
Sustainable
As of October 1, 2025Elevated StalenessFormula / Calculation
Ratio = (Total Federal Interest Payments / Total Federal Tax Receipts) × 100
Why It Matters
Historically, when interest expense exceeds 15-20% of tax revenue, a nation enters a "Fiscal Dominance" regime. At this point, the central bank is effectively forced to keep rates low or monetize debt to prevent a fiscal death spiral, regardless of inflation levels.
Related Metrics & Intelligence
Related Concepts
Sovereign Rollover Risk
The risk that a government cannot refinance its maturing debt obligations at affordable interest rates. Risk peaks when a large portion of outstanding debt is short-duration (bills), forcing frequent refinancing at prevailing market rates. The US faces a structural rollover challenge: approximately $9.2 trillion of debt matures within 12 months (as of 2024), representing ~33% of the total $34T debt stock.Term Premium
The excess yield that investors demand to hold a long-duration bond instead of rolling a series of short-term instruments. It compensates for duration risk (price sensitivity to rate changes), inflation uncertainty, and fiscal supply risk. The ACM Term Premium Model (NY Fed) estimates this component separately from the expected short rate path over the bond's life.Fiscal Dominance
A regime in which a government's debt burden is so large that monetary policy becomes subservient to fiscal needs — effectively forcing the central bank to keep rates low or monetise debt to prevent insolvency. Named by economist Thomas Sargent in 1981. Unlike monetary dominance (where the central bank controls inflation independently), fiscal dominance constrains the central bank's ability to raise rates even when inflation is elevated, because higher rates worsen debt sustainability.Track Interest Expense to Tax Revenue live
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