DSCR Calculator

How the DSCR calculator works

Lenders who finance rental property often care less about your personal paycheck and more about whether the property itself can pay its own mortgage. The debt service coverage ratio is how they measure that. This calculator mirrors the same test: it takes the rent, builds the full monthly payment from your loan and running costs, and divides one by the other. The result is a single number that says how many times over the rent covers the housing bill.

Because the whole ratio turns on the size of the payment, small changes matter. A larger down payment, a lower rate or a longer term all shrink the monthly cost and push the DSCR up. Once you have a ratio you are happy with, it is worth pairing it with the cap rate calculator to gauge the return on the property's value and the cash-on-cash return calculator to see the yield on the actual cash you put in.

How to read your DSCR

The ratio sorts every deal into one of three buckets:

• Below 1.00 — the rent falls short. The property does not earn enough to cover its own payment, so you top up the gap each month. Lenders treat this as higher risk and many will decline it or cut the loan amount.
• Exactly 1.00 — breakeven. Rent covers the payment with nothing to spare. It clears the lowest lender floors but leaves no cushion for a vacant month or a repair.
• Above 1.00 — positive cash flow. The property earns more than it costs. A DSCR of 1.25, for example, means the rent is 25% larger than the payment. This is the comfort zone most lenders and investors aim for.

Why lenders lean on DSCR

On a DSCR loan — sometimes called a non-QM or investor loan — the lender may never look at your tax returns or W-2s. Instead they let the property qualify itself. If the rent comfortably covers PITIA, the loan is far more likely to be repaid on time, so the deal's economics carry the file. That is why raising the ratio, even slightly, can unlock a larger loan or a better rate. A cushion above 1.00 also protects you: it is the buffer that absorbs a surprise vacancy, a jump in the insurance premium, or a tax reassessment without turning the property cash-flow negative.

Ways to raise a weak ratio

• Increase the down payment to shrink the loan, and therefore the principal-and-interest portion.
• Shop for a lower interest rate — even a quarter of a point moves the payment.
• Choose a longer term, or an interest-only structure, to lower the monthly cost (at the cost of more interest over time).
• Raise the rent to market, or trim controllable costs such as insurance by re-shopping the policy.

Estimate only — not a loan offer, approval or financial advice. Lenders verify rent, value, credit and reserves and may apply different minimums, so confirm the current requirement before relying on any figure here.

What lenders typically look for in a DSCR loan

A DSCR loan leans on the property instead of your paycheck, but lenders still set a few baseline requirements. The exact numbers move from one program to the next, so treat these as common ranges rather than fixed rules — always confirm the current guidelines with the lender you plan to use.

Because the ratio is the gatekeeper, the fastest levers are a bigger down payment or a higher rent — both feed straight into the DSCR the lender uses to size and price the loan. You can pressure-test any deal above by nudging those two inputs and watching the ratio move.

How to use it & key terms

Enter the rent, price, down payment, rate and running costs, then press Calculate to see the DSCR, the full monthly payment and your cash flow. Switch the amortization option to compare a fully amortizing loan with an interest-only one.

Residential vs commercial DSCR: two versions of the ratio

The same three letters — DSCR — describe two different calculations depending on which corner of real estate you are in, and mixing them up leads to false comparisons. This calculator uses the residential version that lenders apply to one-to-four-unit rental loans: gross monthly rent divided by PITIA, the full payment of principal, interest, taxes, insurance and association dues. It is deliberately streamlined, letting the property's rent qualify the loan without a deep dive into operating costs, and you will meet it most often on investor mortgages marketed as “DSCR loans.” Both versions share a name and a purpose — measuring how comfortably income covers the debt — which is precisely why the difference is so easy to miss.

The commercial version, used for apartment buildings, retail, offices and other income property, is built differently. It divides annual net operating income by annual debt service. The distinction matters: net operating income already subtracts every operating expense — taxes, insurance, management, maintenance and a vacancy allowance — before the ratio is taken, and debt service here is just the principal and interest. That single choice of numerator, gross rent versus net income, is the whole difference. So a commercial DSCR is the stricter, more complete test, because the income figure has already survived the running costs, while the residential gross-rent version is more forgiving by design.

This is why a 1.25 residential DSCR and a 1.25 commercial DSCR are not the same cushion. The commercial number has already absorbed operating expenses, while the residential one has not, so identical ratios can hide very different real-world safety margins. Both are valid; they simply answer the question at different levels of detail. For your own underwriting it is worth going a step beyond whatever figure a lender quotes and checking coverage on an after-expense basis — effectively the net operating income calculation — because a ratio that looks generous on gross rent can turn slim once management, repairs and vacancy are paid, and that is the number your monthly reality will follow. When you talk to a lender, confirm which definition their program uses; the answer changes how much breathing room a given ratio actually represents.