DSCR Breakeven vs Cap Rate: The Underwriting Metric Lenders Actually Use

TL;DR

Sellers and brokers focus on cap rate because that's the price-discovery metric for net lease deals. Lenders focus on DSCR (debt service coverage ratio) because that's what determines whether they'll fund at the LTV the borrower wants. The two metrics describe the same asset from different angles, but they don't always tell the same story.

The key insight: at any given interest rate and amortization, there's a breakeven cap rate at which DSCR equals 1.0x for a given LTV. Cap rates above breakeven mean the deal can support more debt; cap rates near breakeven mean the deal is thinly covered. Knowing where you sit relative to breakeven turns lender conversations from passive (taking what's offered) to active (negotiating from data).

Quick Definitions

Cap Rate

NOI / Property Value. A 6% cap rate means the property generates $6 of NOI for every $100 of price.

DSCR

NOI / Annual Debt Service. A 1.30x DSCR means NOI is 30% above the annual debt service obligation. Lenders typically require minimum DSCRs in the 1.20x - 1.40x range depending on tenant credit and asset type.

Breakeven Cap Rate (DSCR = 1.0x)

The cap rate at which NOI exactly equals annual debt service for a given LTV, interest rate, and amortization. Below this cap rate, the deal can't service the debt at that LTV; above it, there's coverage cushion.

The Relationship

For a deal at a given LTV (say 65%) and a given mortgage constant (say 6.5% — a function of interest rate + amortization):

Breakeven cap rate = LTV × Mortgage Constant

For 65% LTV at a 6.5% mortgage constant: 65% × 6.5% = 4.225%

In other words, at 65% LTV with these debt terms, NOI fully covers debt service when the cap rate is 4.225% or higher. Above that cap rate, you have positive coverage; below it, you have negative coverage and the lender won't fund at 65% LTV (they'll require more equity).

Why This Matters

Sellers and brokers price deals based on cap rate comps. Lenders quote loan terms based on DSCR coverage. The math has to reconcile or the deal doesn't close.

Common scenarios:

Scenario 1: Cap Rate Well Above Breakeven

Deal: 6.5% cap rate. 65% LTV requested. Mortgage constant: 6.5%. Breakeven cap rate: 4.225%.

DSCR = 6.5% ÷ (65% × 6.5%) = 6.5% ÷ 4.225% = 1.54x

Comfortable coverage. Lender will fund at 65% LTV without issue. Borrower may even be able to push to 70-75% LTV.

Scenario 2: Cap Rate Near Breakeven

Deal: 5.0% cap rate (tight). 65% LTV requested. Mortgage constant: 6.5%. Breakeven: 4.225%.

DSCR = 5.0% ÷ 4.225% = 1.18x

Below the typical lender minimum (1.25x). Lender will likely:

• Require more equity (drop LTV to ~58%)
• Require a longer amortization (lower mortgage constant, hence lower debt service)
• Apply tenant credit overlays that may or may not help

Scenario 3: Cap Rate Below Breakeven

Deal: 4.0% cap rate (very tight, e.g., trophy investment-grade BTS). 65% LTV requested. Mortgage constant: 6.5%. Breakeven: 4.225%.

DSCR = 4.0% ÷ 4.225% = 0.95x

Negative coverage. Cannot fund at 65% LTV. Lender must either:

• Reduce LTV to ~50% (where DSCR returns to acceptable levels)
• Use longer amortization or interest-only structure to lower the mortgage constant
• Decline the deal at conventional terms

This is why some trophy deals require sponsors to accept lower LTVs — the math doesn't support their preferred leverage.

How Mortgage Constant Drives the Math

The mortgage constant is the annual debt service per dollar of loan principal. It's a function of:

• Interest rate: higher rates increase debt service
• Amortization period: longer amortization (or interest-only) reduces debt service
• Loan term: typically same as amortization for traditional loans, different for balloon structures

Approximate mortgage constants at various interest rates and amortization periods:

The mortgage constant determines the breakeven cap rate at any LTV. Given current rates, breakeven cap rates for 65% LTV financing are typically in the 5.0% - 5.7% range.

For deals with cap rates below this range, sponsors typically need to either:

1. Accept lower LTV (50-55%)
2. Use interest-only structure (lowers debt service)
3. Bring in mezzanine or preferred equity (increases cost of capital but achieves target LTV)

How to Calculate Your Deal's Breakeven Cap Rate

Quick formula:

Breakeven cap rate = LTV × Mortgage constant

For your specific deal:

1. Get the lender's interest rate quote (or estimate based on current 10-year Treasury + spread)
2. Determine the amortization the lender will offer (typically 25 or 30 years; sometimes interest-only)
3. Look up the mortgage constant in a financial calculator or table
4. Multiply by the LTV you're requesting

The result is the cap rate at which DSCR = 1.0x. Compare to your deal's cap rate.

If your deal cap rate is materially above breakeven (say 100+ bps), you have flexibility on LTV and DSCR. If your deal is near breakeven, your LTV is constrained.

How DSCR Affects Lender Pricing

DSCR doesn't just determine whether a lender will fund — it also affects the rate they offer:

• Strong DSCR (1.40x+): rate quote at the lender's tightest current spread
• Marginal DSCR (1.25-1.35x): rate quote with 25-50 bps premium
• Tight DSCR (1.20-1.25x): rate quote with 50-100+ bps premium, plus structural requirements (cash management, reserves)
• Below 1.20x: deal often declined or restructured

This means: even when a deal "qualifies" for funding at a given LTV, the rate the borrower pays depends on the coverage cushion.

Working the Math Backwards

Sometimes the right approach is to start from the lender's DSCR requirement and back into the maximum LTV.

For a 1.30x minimum DSCR target:

Maximum LTV = Cap rate ÷ (DSCR × Mortgage constant)

For a 6.5% cap rate, 6.5% mortgage constant, 1.30x DSCR target:

Maximum LTV = 6.5% ÷ (1.30 × 6.5%) = 6.5% ÷ 8.45% = 76.9%

So at this DSCR target, the deal supports up to ~77% LTV. The borrower has room to push leverage if other underwriting criteria are met (sponsor strength, tenant credit, lease term).

For a tighter 5.0% cap rate same scenarios:

Maximum LTV = 5.0% ÷ 8.45% = 59.2%

The deal only supports ~59% LTV at the same DSCR target. The borrower has to accept lower leverage or find different structuring.

The Sponsor / Broker Conversation

For brokers helping sponsors negotiate loan terms:

Step 1: Calculate Breakeven and Required DSCR

Before talking to lenders, calculate:

• Breakeven cap rate at desired LTV
• DSCR at desired LTV
• Maximum LTV at lender's expected DSCR requirement

This gives you the range of possible structures.

Step 2: Match Deal Profile to Lender Type

Different lender categories have different DSCR + LTV preferences:

• Life insurance companies: typically conservative (lower LTV, higher DSCR) but lowest rates
• CMBS: more flexible LTV (up to 75%) but DSCR requirements firm; rate spreads wider
• Banks / regional banks: variable; often willing to flex on terms for relationship borrowers
• Debt funds: highest LTV available (up to 80%+), highest rates, often interest-only

A sponsor wanting maximum LTV may need to look at CMBS or debt funds; a sponsor wanting lowest rate may need to accept conservative LTV from a life co.

Step 3: Understand the Trade-Offs

Higher LTV typically means:

• Higher rate (bps premium for higher leverage)
• More structural requirements (cash management triggers, reserves, recourse provisions)
• Potential negative covenant constraints

Lower LTV typically means:

• Tighter rate
• Fewer structural requirements
• More borrower flexibility

For each deal, the optimal point depends on sponsor objectives (maximize LTV vs minimize cost of capital).

Common Mistakes

Mistake 1: Assuming Conventional 75% LTV Always Works

Tight cap rate deals (under 5.5%) often can't support 75% LTV at conventional DSCR requirements. Sponsors expecting 75% LTV financing on a 4.5% cap rate deal will be surprised.

Mistake 2: Not Stress-Testing for Rate Movement

A deal that works at today's interest rate may not work if rates move 50 bps. Stress test the DSCR at +50 bps and +100 bps. If the deal is marginal at current rates, even small rate movements can blow the structure.

Mistake 3: Ignoring the Mortgage Constant Effect of Interest-Only

Interest-only structures lower the mortgage constant significantly (the IO period). This can rescue marginal-DSCR deals but creates cliff risk at the IO-to-amortization transition. Sponsors should plan for that transition.

Mistake 4: Not Discussing the Cash Management Trigger Threshold

Lenders often include cash management triggers tied to DSCR (e.g., DSCR drops below 1.15x triggers cash management). For deals near the trigger threshold, even small NOI movement can trigger lockbox activation. Negotiate threshold tightness in the loan documents.

Closing

Cap rate is what sells a deal. DSCR is what funds it. The math reconciles when sponsors and brokers understand both perspectives — and when they can articulate to lenders why their specific deal supports the leverage they want.

For brokers, fluency with DSCR math is a differentiator. The brokers who can sit at the table with both their sponsor and the lender, calculate the implications of various structures in real-time, and negotiate accordingly close more deals on better terms than those who hand off the financing conversation entirely.