Types and Structures of Public Debt Instruments
To finance deficits and capital infrastructure, governments issue specialized financial instruments:
- Sovereign Bonds / Treasury Bills: Short, medium, or long-term debt securities backed by the full taxing power of a central government.
- Municipal Bonds: Issued by local states, cities, or counties. They are categorized as either General Obligation (GO) Bonds (backed by general tax revenue) or Revenue Bonds (backed strictly by cash flows generated from a specific project, like a toll bridge or water treatment plant).
Initial and Subsequent Measurement of Debt Obligations
Under IPSAS 41 (Financial Instruments) and GASB 62, public debt instruments are handled via structured financial accounting tracks:
- Initial Measurement: Recorded at fair value minus any transaction costs directly attributable to the issuance (e.g., underwriting fees, legal setup charges). If a bond is issued at a premium or discount, that variance is captured in the initial valuation.
- Subsequent Measurement: Measured at amortized cost using the effective interest method. This mechanism amortizes bond discounts or premiums over the life of the debt instrument, ensuring that the interest expense recorded in each period reflects the true, constant economic yield of the liability.
Initial Face Value +/- Premium/Discount ──► Effective Interest Method Applied ──► Amortized Cost Over Time
Debt Refunding and Defeasance Mechanics
Governments frequently execute debt refundings—issuing new debt at low interest rates to pay off old, high-interest bonds before maturity:
- Legal Defeasance: The old debt is entirely canceled because the government has legally paid off the original creditors.
- In-Substance Defeasance: The government places cash from the new debt issuance into an irrevocable trust invested strictly in risk-free government securities. The trust assets are locked to service the old debt principal and interest automatically. Under GASB and IPSAS, the old debt is removed (“extinguished”) from the balance sheet, and any gain or loss on the transaction is deferred and amortized.
Â