Debt Sustainability

Debt sustainability is an analytical framework used by the IMF, World Bank, and national finance ministries to assess whether a sovereign's debt stock and trajectory are consistent with long-term macroeconomic stability. A debt level is considered sustainable if the government can meet all current and future debt service obligations (principal repayment + interest) in full, without recourse to debt relief, exceptional financing, or a damaging contraction in public expenditure. The core analytical metric is the debt-to-GDP ratio, which captures the size of debt relative to the economy's capacity to generate the fiscal revenue needed to service it. Sustainability also depends on the primary fiscal balance (revenue minus non-interest expenditure), the real interest rate, the real GDP growth rate, and the currency composition of debt (foreign currency debt carries exchange rate risk). The IMF's Debt Sustainability Analysis (DSA) framework models multiple stress scenarios — growth shocks, exchange rate depreciation, interest rate spikes — to determine whether a country's debt trajectory remains on a sustainable path under adverse conditions. For India, the FRBM (Fiscal Responsibility and Budget Management) Act, 2003 and its amendments define fiscal sustainability targets. The N.K. Singh Committee (2017) recommended a debt-to-GDP target of 60% for general government (40% Centre + 20% states) to be achieved by 2022-23. India's general government debt stood at approximately 83-84% of GDP in FY2024, well above the recommended ceiling — a vulnerability that rating agencies (Moody's, S&P, Fitch) cite when keeping India's sovereign rating at the lowest investment grade. The debt sustainability concern is also central to IMF-World Bank assessments of highly indebted emerging economies and in discussions on debt relief for LDCs (Least Developed Countries) under the G20 Common Framework.

• 1 Debt-to-GDP ratio: primary sustainability metric — India's general government debt ~83-84% of GDP (FY2024), above the 60% FRBM target.
• 2 FRBM Act, 2003 targets: fiscal deficit ≤3% of GDP (Centre); primary deficit to be eliminated progressively.
• 3 N.K. Singh Committee (2017): recommended 60% general government debt ceiling (Centre 40% + states 20%) by FY2023.
• 4 IMF DSA: stress-tests debt trajectory under GDP growth shock, interest rate spike, exchange rate depreciation scenarios.
• 5 Debt trap diplomacy: a geopolitical dimension — China's BRI lending to developing nations is critiqued as creating debt dependencies (Hambantota Port, Sri Lanka).
• 6 Primary balance: if primary balance is positive (revenue > non-interest spending), the debt ratio tends to fall over time, all else equal.
• 7 Sri Lanka 2022 default: foreign currency debt servicing collapsed when forex reserves fell below three weeks of imports — textbook sustainability breach.

India's fiscal consolidation path post-COVID is a direct application of debt sustainability analysis. The Union Budget 2024-25 set a fiscal deficit target of 5.1% of GDP, down from 5.8% in FY24, with an explicit glide path to 4.5% by FY2026 — a credible commitment to reduce the debt-to-GDP ratio over the medium term. The government cited the FRBM framework and IMF recommendations in justifying this consolidation despite domestic demands for higher social spending.