Before any lender asks about my business plan, they look at one number: the DSCR. If it's wrong, the conversation is over before it starts.
DSCR stands for debt service coverage ratio. The formula is simple: net operating income divided by annual debt service. If a property makes $125,000 in NOI and the yearly mortgage payments are $100,000, the DSCR is 1.25x. That means the property earns 25 cents more than it needs for every dollar of debt payment.
For agency multifamily loans, 1.25x is the standard floor. Fannie Mae's small balance program requires a minimum 1.25x DSCR; Freddie Mac's multifamily programs generally look for 1.20x to 1.50x depending on the deal. That range is not a suggestion. The underwriter will not round up, and they will not make an exception because the building has a nice facade.
A 1.0x DSCR means the property breaks even on debt payments, and lenders hate it. One bad month, one boiler failure, one vacant apartment at the wrong time, and the loan stops performing. Coverage below 1.20x is very hard to finance conventionally.
The part most first-time buyers miss: lenders don't always use your actual interest rate. Many underwriters stress-test the DSCR using a rate 25 to 50 basis points above the contract rate, to check whether the building still covers its payments if rates move. So your DSCR at the rate you're quoted is not necessarily the DSCR the lender uses to size your loan.
There's also a sister metric worth knowing: debt yield. That's NOI divided by the loan amount, no rate involved at all. It exists because DSCR can look great with a low interest rate and debt yield doesn't care about rates. Lenders size the loan to whichever of the three tests binds first — DSCR, loan-to-value, or debt yield. On most of my deals, the tightest one wins, and it's usually not the one the buyer was watching.
Here's a concrete way to feel what coverage buys you. Take a building with $475,000 of NOI and $365,000 of annual debt service: that's a 1.30x DSCR, comfortably above agency minimums. That property can lose roughly 23% of its NOI before the debt no longer covers itself. That 23% is the whole point of the ratio. It isn't a grade on last year's performance; it's a budget for next year going wrong.
The other moment DSCR bites is at refinance. Take that same property and refinance it from 6.50% to 8.00% with no change in operations: annual debt service climbs from roughly $365,000 to $417,000, and the DSCR drops from 1.30x to 1.14x — below most lender thresholds — with the building performing exactly as it did before. That's the rate shock of the last few years. The borrower in that spot either injects more equity, extends the amortization, or accepts worse terms, and none of those options get cheaper when you need them most.
Here's the operational part, which is the part that matters to me. You don't improve your DSCR by negotiating with the lender. You improve it before you ever apply. Collections discipline, fast unit turns, grieved tax assessments, controlled insurance premiums — every dollar of expense you cut and every dollar of rent you actually collect flows straight into NOI, and NOI is the top half of the ratio. DSCR is really an operations score wearing a finance costume.
I run every deal at the DSCR before I run anything else. If the coverage works with a cushion at a stressed rate, the rest of the underwriting tends to take care of itself.
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