DSCR (debt service coverage ratio)

DSCR is net operating income divided by annual debt service.

NOI / annual debt service = DSCR

If NOI is $780,000 and annual debt service is $650,000:

$780,000 / $650,000 = 1.20x

That means the property produces $1.20 of NOI for every $1.00 of debt service. The thinner that cushion, the less room the business plan has to trip.

DSCR is the pressure gauge between the property’s operations and its loan payment. At 1.20x, the gauge does not say “great deal.” It says the modeled NOI covers debt service with twenty cents per dollar left before the other claims on cash start introducing themselves.

This gauge measures survival, not applause

DSCR is not a return metric. It is a survival metric.

If this changes	DSCR moves because
Occupancy drops	NOI falls
Insurance jumps	NOI falls
Interest rate rises	Debt service rises
Amortization begins	Debt service rises
Taxes reassess	NOI falls

A property can show a nice equity multiple and still have ugly debt coverage. The lender cares about the payment, not the pitch.

That is the useful cruelty of DSCR. It ignores the beautiful five-year story and asks whether this year’s operations can carry this year’s debt.

Interest-only can pad the gauge

Suppose a model uses interest-only debt at $610,000 per year.

Case	NOI	Debt service	DSCR
Interest-only year	$780,000	$610,000	1.28x
Amortizing year	$780,000	$720,000	1.08x
NOI miss plus amortization	$725,000	$720,000	1.01x

That is how a deal can look comfortable early and then start breathing through a straw.

The first row did not prove the debt was comfortable. It proved the payment was temporarily smaller. When amortization begins, the same NOI produces 1.08x. Miss the NOI as well and 1.01x leaves one cent of modeled coverage per debt-service dollar. That is not a cushion. It is upholstery.

Read the loan before trusting the dial

Read the lender term sheet for interest rate, amortization, maturity, interest-only period, reserve requirements, rate caps, covenants, and extension tests.

Then read the model to see which of those terms actually made it into the cash flow. Debt details left outside the model are not details. They are traps with paperwork.

Check the items that can move either side of the ratio:

• Rent roll, occupancy, collections, and the operating statements supporting NOI.
• Current tax bill, insurance quote, and any reassessment or premium assumptions.
• Loan term sheet and draft loan documents for rate, amortization, interest-only period, and covenants.
• Rate-cap terms, reserve requirements, extension tests, and maturity date.

The model is the gauge face. Those documents are the pressure line. A clean display connected to invented inputs is just office decoration.

Find the year with the least room

Build a DSCR calendar by year:

Year	NOI	Debt service	DSCR	Note
1	$___	$___	___x	Interest-only?
2	$___	$___	___x	Renovation disruption?
3	$___	$___	___x	Amortization begins?

Then lower NOI by 5% and raise debt service by 5%. If DSCR barely survives the base case, do not let projected upside do the lender’s job.

Average DSCR can smooth over the exact year when renovation disrupts income, amortization starts, or a rate cap expires. Debt is paid by date, not by the emotional average of five columns.

Make the tightest reading explain itself

Ask which year has the lowest DSCR and why. Average DSCR can hide one ugly year, and one ugly year can be enough.

Your next move is to circle the lowest annual DSCR, trace its NOI and debt service to source documents, and rerun that year with the required 5% stress in both directions. If the pressure gauge is already near the edge in the base case, upside is not a repair kit.