DSCR Rent Shock Stress Test Calculator
Debt Service Coverage Ratio measures NOI relative to debt service. Lenders require DSCR above 1.20-1.25 at origination. A stress test models what happens if rents fall, vacancy rises, or rates reset. Properties that fail stress test (DSCR drops below 1.0) face refinance risk or forced sale during downturns.
Why DSCR Stress Tests Matter
CMBS and bank lenders model property cash flow against rent declines, vacancy spikes, and rate resets. Properties at 1.20x DSCR origination drop below 1.0x DSCR with just 15-20% rent decline. The 2008-2010 commercial real estate crash saw thousands of multifamily and office properties go through DSCR breaches when rents fell and refis came due. Stress testing identifies which properties survive.
Common Stress Scenarios
Mild recession: -5% rent, +3pp vacancy, +5% debt service (rate reset). Severe recession (2008-style): -15% rent, +8pp vacancy, +20% debt service. COVID-style sector shock: -25% rent, +12pp vacancy, no rate change (zero-rate era). Office sector 2023-2025: -30% rent, +15pp vacancy, +30% rate reset. Match scenario to property class and market.
Mitigation Strategies
Three plays: (1) Build 6-12 month debt service reserve at origination. (2) Lock rates with interest-only periods 2-3 years to weather rent volatility. (3) Maintain LTV under 65% so refi flexibility exists even when rates rise. Aggressive 75%+ LTV deals signed in 2020-2022 are now the most distressed segment of commercial real estate in 2025-2026.
Source: Federal Reserve CMBS Distress Indicators 2024, Mortgage Bankers Association Quarterly Commercial Real Estate Report 2025. Last updated: May 2026.