DSCR (Debt Service Coverage Ratio) — Definition & CRE Underwriting Guide
DSCR is the ratio of a property's annual underwritten net cash flow to its annual mortgage payment. It measures how comfortably the property covers debt — and it's one of the three binding constraints in CMBS conduit underwriting (alongside LTV and Debt Yield).
Key Takeaways
- DSCR = Annual Underwritten NOI ÷ Annual Debt Service
- NOI is underwritten with vacancy reserves + replacement reserves + market-rate management fee — not pro-forma
- CMBS DSCR floors (May 2026): Multifamily 1.25x, Industrial 1.30x, Self-Storage 1.35x, Retail 1.35x, Office 1.40x, Hotel 1.40x
- Different from residential DSCR (1-4 unit) which uses Gross Rent ÷ PITIA — simpler formula, lower floors (1.05-1.10x)
- DSCR often binds first on multifamily at low cap rates; LTV binds first on office; debt yield binds on hotel
Definition
**DSCR (Debt Service Coverage Ratio)** is the ratio of a property's annual underwritten net cash flow to its annual mortgage payment.
**Formula:** DSCR = Annual NOI ÷ Annual Debt Service
The NOI is computed with **vacancy reserves + replacement reserves + market-rate management fee** deducted from gross income — not pro-forma. The annual debt service uses contract rate + amortization schedule × 12 months.
DSCR is the primary cash-flow coverage metric in CRE underwriting and **one of the three binding constraints in CMBS conduit lending** (alongside LTV and Debt Yield).
How DSCR Floors Vary by Property Type (May 2026 CMBS Conduit)
| Property Type | Min DSCR | |---|---| | Multifamily / MHC | 1.25x | | Industrial / Logistics | 1.30x | | Self-Storage | 1.35x | | Anchored Retail | 1.35x | | Office (Class A) | 1.40x | | Hotel | 1.40x |
Hotel + office + retail tighter DSCR reflects operating-business cash flow volatility (hotel), valuation uncertainty (office), and tenant-credit exposure (retail). Multifamily lowest DSCR because rental cash flows are most predictable.
How DSCR Is Calculated Step by Step
**Step 1: Compute trailing-12-month gross income.** Use actual rent rolls + ancillary income (parking, laundry, storage fees, etc.).
**Step 2: Deduct vacancy reserve.** 5-10% standard, varies by property type + market. Multifamily Tier-1 markets ~5%; secondary markets 7-10%; office/retail can run higher.
**Step 3: Deduct operating expenses + replacement reserves + market-rate management fee.** Operating expenses include property taxes, insurance, utilities, repairs/maintenance, payroll, marketing. Replacement reserves $250-$500/unit/year for multifamily; varies for other property types. Market-rate management fee 3-5% of effective gross income (industry-typical, not actual contract rate).
**Step 4: Result is NOI.** This is the underwritten NOI for CMBS sizing.
**Step 5: Compute annual debt service.** Monthly payment × 12 using contract rate + amortization schedule (typically 25 or 30 years).
**Step 6: DSCR = NOI ÷ Annual Debt Service.**
**Worked example:** Multifamily property, $2.0M trailing-12-month gross rent + $150K ancillary = $2.15M gross. Less 5% vacancy ($107K) = $2.04M effective gross. Less $700K operating expenses, $50K replacement reserves, $80K management fee (4% of effective gross) = $1.21M NOI. New $20M CMBS at 6.21% on 30-yr amort = $122,567/month × 12 = $1.47M annual debt service. **DSCR = $1.21M ÷ $1.47M = 0.82x — DECLINED**, deal needs sizing to ~$15M to clear 1.25x DSCR. PeerSense pre-runs this math before formal submission.
DSCR for CMBS vs DSCR for Residential Rental Loans
Different formulas, different floors.
**CMBS DSCR (commercial real estate):** - Formula: NOI ÷ Annual Debt Service - NOI deducts vacancy + reserves + management fee from gross income - Floors 1.25-1.40x by property type - Conservative — accounts for operating expenses
**Residential rental DSCR (1-4 unit investor properties):** - Formula: Gross Rent ÷ PITIA (Principal + Interest + Taxes + Insurance + Association) - Simpler — just gross rent vs PITIA monthly payment - Floors 1.05-1.10x for best execution - Less conservative — doesn't deduct vacancy or operating expenses
Residential DSCR is the primary metric for non-QM rental loans (DSCR rental loans for 1-4 unit investor properties). CMBS DSCR is the primary metric for $5M+ commercial real estate.
When DSCR Binds the Deal
**DSCR often binds first on multifamily deals at low cap rates** (4.5-5.5%) — the low cap rate compresses NOI relative to property value, and the 1.25x DSCR floor demands a higher NOI ÷ debt service ratio than LTV cap delivers.
**LTV often binds first on office deals at conservative cap rates** — high cap rate generates robust NOI relative to value, but the 60-65% LTV cap is fixed.
**Debt Yield often binds first on hotel deals** — the 12.0% debt yield floor for hotel CMBS is materially higher than DSCR or LTV translates to.
PeerSense pre-runs all three tests (DSCR, LTV, Debt Yield) before formal CMBS submission. The smallest result is the maximum loan. Sizing the deal to the binding constraint avoids late-process declines.
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Editorial integrity: Published by PeerSense Capital Advisory · Written by Ed Freeman, Founder. PeerSense is a capital advisory firm, not a lender. Content is for educational purposes and does not constitute financial, legal, or tax advice. Rates and terms cited reflect approximate May 2026 market conditions and may not reflect current conditions at the time of reading. Consult a qualified financial professional for transaction-specific guidance.