Debt Service

How It Works

Debt service is a fixed legal obligation that must be paid regardless of economic conditions under GO bond covenants and revenue bond indentures. It typically consumes 5-15% of a city's general fund budget, with rating agencies generally considering 10% and below as "moderate," 10-15% as "high," and above 15% as "elevated" and a credit weakness. New York City allocated approximately 10-12% of its general fund to debt service in recent budgets, while Chicago's combined debt service and pension contribution exceeds 25% of own-source general fund revenue, crowding out discretionary spending on services. Debt service includes interest (the cost of borrowing) and principal amortization (repayment of the original loan), and for variable-rate bonds or swaps, may include remarketing fees, letter of credit costs, and swap payments. Most muni bonds are structured as serial bonds with level annual debt service (a declining principal amortization offsetting declining interest), producing a flat payment profile similar to a home mortgage. Term bonds with sinking fund requirements and capital appreciation bonds ("CABs," which defer all payments until maturity and can balloon to 10x the original issuance amount) add complexity. Financial analysts track the debt service coverage ratio (DSCR) for revenue bonds, calculated as net operating revenue divided by annual debt service. Enterprise fund rate covenants typically require DSCR of 1.20x-1.50x, and a DSCR below 1.0x means revenues are insufficient to cover debt payments, triggering technical default. Debt service as a percentage of general fund expenditures is a direct input to the 20% debt burden weighting in the CitySpend Fiscal Health Score.

Related Terms

• Municipal Bond, A debt security issued by a city, county, state, or other government entity to finance capital expenditures. Interest income is generally exempt from federal income tax.
• General Obligation Bond (GO Bond), A municipal bond backed by the full faith, credit, and taxing power of the city, meaning the city pledges to raise taxes if necessary to repay bondholders.
• Debt Per Capita, A city's total outstanding debt divided by its population, a key metric for comparing debt burdens across cities of different sizes.