How to Calculate DSCR
One division decides whether a rental qualifies: monthly rent ÷ monthly PITIA. Here's exactly what goes into each half, where the numbers come from, and four worked examples — single-family, condo, small multifamily, and short-term rental.
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By OneMoreDoor Capital Team · Updated
The formula for DSCR fits on one line — rent divided by payment — which is exactly why it's so easy to get wrong. The number is only as good as the two inputs you feed it, and most do-it-yourself DSCR math breaks on a forgotten tax bill, a gross short-term-rental figure, or a payment that quietly left out insurance. This guide walks the formula and four worked examples so your number matches the one a lender calculates. New to the product itself? Start with what a DSCR loan is.
How do you calculate DSCR?
DSCR is one division: the property's monthly rent divided by its full monthly payment. That payment is PITIA — principal, interest, taxes, insurance, and any HOA or association dues. A home renting for $2,400 against a $2,000 PITIA calculates to $2,400 ÷ $2,000 = 1.20, meaning the rent covers the payment with 20% to spare.
The whole product lives in that ratio. At 1.0 the rent exactly covers the payment; above 1.0 the property pays you; below 1.0 it runs short on paper. Two inputs decide everything, and nearly every calculation error comes from mishandling one of them — so the rest of this page is really about sourcing the numerator (rent) and the denominator (PITIA) correctly.
What is included in PITIA?
PITIA is the all-in monthly payment the DSCR has to cover: Principal, Interest, Taxes, Insurance, and Association dues. It is not just principal and interest — property taxes and insurance are part of the ratio, which is why a high-tax or high-premium market can pull a strong-looking rent down to a thin DSCR.
- Principal — the portion of the payment that pays down the loan balance
- Interest — the cost of the money, at the loan’s note rate
- Taxes — annual property taxes, divided down to a monthly figure
- Insurance — the landlord or hazard premium, also monthly
- Association dues — HOA or condo fees, where the property has them
What PITIA leaves out matters just as much. DSCR does not subtract operating expenses — property management, maintenance, vacancy reserves, utilities, or capital repairs. Those belong in a cash-flow or cap-rate analysis, not in the coverage ratio. DSCR is a debt-coverage test, not a profitability test, so the denominator is strictly the cost of carrying the financing plus the taxes, insurance, and dues that ride with ownership.
Where does the rent number come from?
Lenders use the lower of two figures: the in-place lease or the appraiser's market-rent analysis (the Form 1007 that rides along with a single-family appraisal). If your signed lease is $2,300 but the appraiser supports $2,000 in market rent, the calculation uses $2,000 — the lower number — so the DSCR reflects rent the property can reliably command.
That lower-of rule is why a below-market lease can hold your ratio down and why an above-market lease doesn't inflate it. On a purchase with no lease in place, the market-rent analysis stands on its own, so a vacant or newly bought property can still be qualified. Short-term rentals follow a different documentation path — an operating history or a market revenue projection — which the STR example below covers.
How do you calculate DSCR on a single-family rental?
Start with the cleanest case. A single-family rental collects one rent against one payment. Say it rents for $2,400 a month and the full PITIA — principal, interest, taxes, and insurance — comes to $2,000. Divide the first by the second and the DSCR is 1.20: the rent clears the payment with a comfortable cushion.
No HOA, one tenant, one lease — this is the baseline every other scenario adjusts from.
How does an HOA affect DSCR on a condo?
A condo adds one line to the denominator: association dues. Take the same $2,400 rent, but the unit carries $300 a month in HOA fees, lifting PITIA from $2,000 to $2,300. The DSCR drops from 1.20 to 1.04 — the rent still covers the payment, but the cushion nearly disappears, and dues aren't optional.
HOA dues are the input investors most often forget, because they don't appear on a standard mortgage statement. Push the fee higher or the rent lower and the ratio slips under 1.0 — not the end of the deal, but the point where you'd ask about no-ratio DSCR loans instead.
How do you calculate DSCR on a 2–4 unit property?
On a 2–4 unit property, you add up the rent from every unit and divide the combined total by the building's single PITIA. A triplex renting at $1,500, $1,400, and $1,300 collects $4,200 a month; against a $3,000 PITIA, the DSCR is 1.40 — small multifamily often carries a stronger ratio because several rents share one payment.
Use the same lower-of logic per unit: the lender leans on leases where they exist and the appraiser's market rents (a Form 1025 rent schedule on 2–4 units) where they don't. A vacant unit doesn't zero out — its supportable market rent still counts toward the combined total.
How do you calculate DSCR on a short-term rental?
A short-term rental earns uneven, seasonal revenue, so you annualize and average it, then haircut for vacancy before dividing. Take a property grossing about $54,000 a year: that's $4,500 a month gross, but after realistic vacancy and off-season weeks you underwrite closer to $3,500 effective. Against a $2,800 PITIA, the DSCR is 1.25.
The number that sinks STR math is gross revenue used raw. A listing that grosses $4,500 a month does not collect $4,500 every month — booking gaps, cleaning turnover, and slow seasons are real. Lenders qualify short-term rentals on a 12-month operating statement or a market revenue projection, averaged to a monthly figure, not on peak-season screenshots.
Does the DSCR formula change by property type?
No. The formula is always monthly rent ÷ monthly PITIA. What changes is how you source each side — combined rents for multifamily, averaged and vacancy-adjusted revenue for a short-term rental, HOA dues folded into PITIA for a condo. Same arithmetic, different plumbing. Here are the four examples side by side:
| Scenario | Monthly rent used | Monthly PITIA | DSCR |
|---|---|---|---|
| Single-family | $2,400 | $2,000 | 1.20 |
| Condo (with HOA) | $2,400 | $2,300 | 1.04 |
| Triplex (combined rents) | $4,200 | $3,000 | 1.40 |
| Short-term rental (effective) | $3,500 | $2,800 | 1.25 |
Every row is the same division. If you'd rather skip the arithmetic, run the property through the DSCR calculator and it computes the ratio as you type.
What are the most common DSCR calculation mistakes?
Three mistakes account for most bad DSCR math: using principal and interest instead of full PITIA, forgetting taxes and insurance (or HOA dues), and using a short-term rental's gross revenue without a vacancy haircut. Each one inflates the ratio and produces a number the lender's file won't match — usually mid-underwriting, at the worst possible moment.
The P&I error is the sneakiest, because a mortgage calculator hands you a clean principal-and-interest figure that feels complete. It isn't. Taxes and insurance can add hundreds a month, and on a condo the HOA adds more. A deal that pencils at 1.25 on P&I alone can land at 1.05 on true PITIA.
Two more worth naming: mixing time periods — annual rent over a monthly payment — and treating a below-market lease as if the appraiser will bless a higher number. Underwrite the rent the property actually supports and the payment it actually costs, and your ratio will match the one your lender calculates.
The short version: DSCR never gets more complicated than rent ÷ PITIA. The skill is sourcing the two inputs honestly — full PITIA including taxes, insurance, and dues; the lower of lease or market rent; and, for short-term rentals, revenue that survives a real vacancy assumption. Get those right and your math will match the lender's. To see where a specific property lands, run your numbers.
Does the DSCR formula use monthly or annual numbers?
Either works, as long as you don't mix them. Monthly rent divided by monthly PITIA and annual rent divided by annual debt service produce the same ratio. Residential lenders usually state it monthly. The classic error is dividing annual rent by a monthly payment, which inflates the ratio twelvefold and produces a number that means nothing.
Can I calculate DSCR before I own the property?
Yes. On a purchase, the appraiser's market-rent analysis — the Form 1007 on a single-family — supplies a supportable rent figure, so you can compute a realistic DSCR before you close and before a tenant ever signs. You don't need an in-place lease to know roughly where a property's ratio will land.
Does a cash-out refinance change my DSCR?
Yes, and usually downward. A cash-out refinance raises the loan balance, which raises the monthly PITIA, which lowers the ratio the rent has to cover. The rent didn't change; the payment grew. It's why an aggressive cash-out can pull a comfortable 1.25 down toward breakeven — worth modeling before you decide how much equity to pull.
Is DSCR the same as cap rate or cash-on-cash return?
No. Cap rate divides net operating income by the property's value; cash-on-cash divides annual pre-tax cash flow by the cash you invested. DSCR divides rent by the loan payment. DSCR is the lender's coverage test, not a return metric — a property can post a strong DSCR and a mediocre cap rate, or the reverse.
What DSCR do lenders usually want to see?
Most programs look for a ratio at or above 1.0, with stronger ratios earning better pricing — but exact minimums are program-dependent [PENDING]. A number below 1.0 isn't automatically declined, either: no-ratio DSCR loans exist for strong deals in expensive markets where the rent-to-payment math runs thin. The ratio steers pricing more often than it closes the door.
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