Guide

Debt yield explained

Harbor Logistics closed a $62 million mortgage on a 420,000-square-foot distribution center in late 2023. Underwriters stamped the deal at a 9.0% debt yield — stabilized net operating income of $5.58 million divided by the loan amount. The loan was interest-only for three years, so debt service coverage looked comfortable at 1.42× even after a modest rate step-up. Eighteen months later a major tenant downsized, market rents on renewals softened, and trailing NOI fell to $4.10 million. DSCR on the interest-only payment still read 1.36× — above the 1.25× covenant. But trailing debt yield had dropped to 6.6%, below the 7.5% minimum in the loan agreement. The lender invoked a cash management trap: operating cash flowed into a controlled account until NOI recovered or the borrower prepaid principal. Harbor re-tenanted the vacated bay, signed a below-market anchor extension in exchange for a longer term, and injected $4 million of equity to pay down the loan to $58 million. Within four quarters trailing debt yield recovered to 7.8% and the trap released. The lesson: debt yield measures how much income the collateral generates relative to the loan balance, independent of interest rates and amortization schedules. It is the lender’s rate-agnostic cushion against NOI erosion.

This guide covers debt yield formulas, origination versus trailing tests, typical lender floors by property type, how debt yield interacts with DSCR and loan-to-value, the Harbor Logistics refactor, a technique decision table, pitfalls, and an investor checklist.

What debt yield measures

Debt yield is the ratio of property net operating income to outstanding loan principal, expressed as a percentage:

Debt yield = NOI ÷ Loan amount

Unlike interest coverage or DSCR, debt yield does not depend on the coupon, amortization schedule, or whether the loan is interest-only. If NOI is $5 million on a $50 million loan, debt yield is 10% whether the note pays 4% or 8%. That makes it a pure measure of income relative to leverage on the collateral.

Commercial mortgage lenders adopted debt yield widely after the 2008 crisis as a backstop against aggressive LTV and thin DSCR at artificially low rates. Typical uses:

Origination sizing — maximum loan = NOI ÷ minimum debt yield (e.g., $6M NOI ÷ 9% floor = $66.7M cap).
Ongoing monitoring — trailing debt yield tested quarterly; breach triggers cure, cash trap, or default.
Extension and refinance gates — maturity extensions often require debt yield at or above a stated percentage of the original minimum.
Special servicer workouts — debt yield quantifies how far NOI must recover before a loan is “right-sized” without a full appraisal.

A debt yield below a lender’s floor means the loan is over-levered relative to current income, even if payment coverage still looks fine on an interest-only structure.

Formula and worked example

The standard stabilized form at closing:

Debt yield (%) = (Stabilized NOI ÷ Loan amount) × 100

Trailing debt yield substitutes the most recent annualized NOI (often T-12 or T-3 annualized) for stabilized NOI and uses current loan balance after any paydowns:

Trailing debt yield = Trailing NOI ÷ Current loan balance

Some agreements define NOI net of replacement reserves or capex escrows — always match the credit agreement’s definition.

Harbor Logistics — Riverside Distribution (simplified, $ millions):

At origination (2023)

Stabilized NOI: $5.58
Loan amount: $62.0
Debt yield = $5.58 ÷ $62.0 = 9.0%
Interest-only debt service: ~$3.94 (at ~6.35%)
DSCR = $5.58 ÷ $3.94 = 1.42×

Stressed quarter (2025)

Trailing NOI: $4.10
Loan balance: $62.0 (no paydown yet)
Trailing debt yield = $4.10 ÷ $62.0 = 6.6% (breach vs 7.5% floor)
DSCR = $4.10 ÷ $3.01 = 1.36× (still above 1.25× covenant)

The divergence is structural: DSCR compares NOI to a payment that excludes principal on an IO loan; debt yield compares NOI to the full loan stock. NOI fell 26.5%; debt yield fell the same proportion; DSCR fell less because the denominator (interest) moved with rates but not with principal balance.

Post-refactor

Trailing NOI: $4.52 (re-tenanting + anchor extension)
Loan balance: $58.0 (after $4M paydown)
Trailing debt yield = $4.52 ÷ $58.0 = 7.8%

Implied maximum loan at 7.5% floor on recovered NOI: $4.52 ÷ 0.075 = $60.3M — still below the original $62M, explaining why the equity paydown was required.

Debt yield vs DSCR vs LTV vs cap rate

CRE and credit metrics answer different questions:

Metric	Formula (typical)	Rate-sensitive?	What it tests
Cap rate	NOI ÷ Property value	No (on income side)	Market pricing of income
LTV	Loan ÷ Value	Indirectly (via value)	Collateral cushion vs appraisal
Debt yield	NOI ÷ Loan	No	Income cushion vs leverage
DSCR	NOI ÷ Debt service	Yes	Payment capacity (P&I)
Interest coverage	NOI or EBIT ÷ Interest	Yes	Coupon coverage only

Debt yield and LTV are linked through value. If cap rate is 6% and debt yield is 9%, implied LTV ≈ debt yield ÷ cap rate = 9% ÷ 6% = 150% — an over-levered structure. At origination, lenders often require debt yield high enough that even if value falls 20–30%, LTV and debt yield remain inside policy. Harbor’s 9.0% debt yield at a 5.75% going-in cap implied ~63% LTV — conservative on day one.

Debt yield and DSCR diverge when loans are interest-only, rates are low, or amortization is back-loaded. A borrower can pass DSCR while failing debt yield if NOI erodes. Conversely, rising rates crush DSCR while debt yield is unchanged (same NOI, same loan). Underwrite both.

Lender minimum debt yield floors

Illustrative minimum debt yield bands at origination (actual terms vary by lender, market, and sponsorship):

Property type	Typical minimum debt yield	Notes
Multifamily (agency / stabilized)	7.5% – 9.0%	Lower for top sponsors and core markets
Industrial / logistics	8.0% – 10.0%	Harbor at 9.0% origination
Office (CBD / suburban)	9.0% – 11.0%+	Higher floors post-2020 vacancy stress
Retail (anchored / strip)	9.0% – 11.5%	Tenant credit and rollover risk priced in
Hospitality	10.0% – 13.0%	Volatile NOI; often tested on underwritten stabilized
Construction / bridge	Variable	Often tested at stabilization takeout, not initial funding

Trailing tests may use the same floor or a haircut (e.g., 75–100 bps below origination minimum). Cash management traps typically activate at trailing breach and release only after two consecutive compliant quarters or a principal paydown that restores yield.

Technique decision table

Question	Use debt yield	Use something else
Is the loan sized safely vs current NOI?	Yes — primary metric	LTV if appraisal is trusted
Can the borrower make this month’s payment?	No	DSCR or interest coverage
How is the market pricing this asset?	No	Cap rate, comparable sales
Rate rose 200 bps — is collateral still OK?	Yes — unchanged if NOI stable	DSCR will fall; stress both
Tenant left — refi at maturity?	Yes — trailing debt yield gates extension	Updated LTV appraisal
Corporate term loan (no single asset)	Rare at loan level	Net debt/EBITDA, cash flow to debt

Common pitfalls

Stabilized vs trailing mismatch — origination at 9% on pro forma NOI while trailing is 7%; lenders test trailing.
NOI definition drift — excluding reserves at closing but requiring them in trailing tests.
Ignoring partial paydowns — debt yield improves when principal is paid down even if NOI is flat.
DSCR-only monitoring on IO loans — Harbor passed DSCR while failing debt yield.
Cap rate compression illusion — rising value lowers LTV but does not improve debt yield if NOI is flat.
Single-tenant rollover — one lease expiry can cut NOI 30%+; model debt yield at expiring rent, not in-place.
Cross-collateralized pools — property-level debt yield may breach while pool-level DSCR passes.

Investor checklist

Locate minimum debt yield in the term sheet and note origination vs trailing definitions.
Compute debt yield at closing on both underwritten and trailing NOI.
Stress NOI −10% and −20%; recompute trailing debt yield and distance to floor.
Pair with DSCR on P&I and interest-only bases through rate shocks.
Derive implied LTV from debt yield and cap rate; cross-check appraisal.
Map cure remedies: cash trap, mandatory paydown, default interest.
For REITs, check secured debt footnotes for pool-level debt yield disclosures.
At maturity, estimate refi proceeds using trailing debt yield lender will apply.
Compare to net debt/EBITDA on corporate guarantees if any.
Document release conditions for cash management traps before underwriting equity.

Key takeaways

Debt yield = NOI ÷ loan balance — a rate-independent income cushion.
It can breach while DSCR passes on interest-only loans when NOI falls.
Lender floors typically run 7.5%–11%+ depending on property type and risk.
Trailing tests drive cash traps and refi gates — not just origination math.
Use debt yield with DSCR, LTV, and cap rate for complete CRE credit analysis.