Solve for

Annual NOI divided by annual debt service. This is the covenant number: how many dollars of income stand behind each dollar of payment.

The figures
Income after vacancy and operating expenses, before debt service, income taxes, and capital expenditure. Lenders usually recompute it lower, with reserves deducted.
Principal plus interest for twelve months. Use the helper below if you have a loan quote instead of a payment.
Computed from the other two. Pick a different figure above to type this one.
Have a loan quote instead of a payment?
The quoted proceeds.
The all-in coupon.
The schedule the payment is computed on.

Standard amortizing payment: $41,084 a month, $493,013 a year. Same arithmetic as the loan sizing calculator. An interest-only year's debt service is lower: the loan times the rate.

Debt service coverage ratio1.25x
DSCR
1.25x
Monthly debt service
$40,000
NOI above the payment
$120,000
NOI can fall before 1.00x
20.0%

The cushion at the levels a loan document tests

A DSCR is a covenant as much as a ratio: the loan is sized at one level and then tested at another for the life of the loan. Each row shows the NOI at which coverage sits exactly at that level, and how much of today's income could disappear first.

$600,000 of annual NOI against $480,000 of annual debt service.
Coverage levelNOI at that levelCushionAs a share of NOI
1.00x, breakeven$480,000$120,00020.0%
1.20x, a common ongoing covenant$576,000$24,0004.0%
1.25x, a common sizing floor$600,000$00.0%

Annual convention throughout: NOI and debt service both measured over twelve months, principal plus interest. Whether reserves are deducted above the NOI line and whether the ratio is tested at the note rate or a stress rate are choices this page cannot make for you; the lender's term sheet makes them, and the honest comparison uses the lender's.

Everything above is computed in your browser. Nothing you type is sent to Altyst or to the site hosting this calculator, and this frame sets no cookie. It is arithmetic on the figures you entered, not investment or lending advice.

Coverage is one of the three tests a lender runs; the loan is sized by whichever of the three allows the least. Altyst reads the deal documents, builds the NOI, and runs all of it.