DSCR Calculator for Rental Property - Rental Flow
Landlord Calculator

DSCR Calculator

The Debt Service Coverage Ratio tells you, and your lender, how many times over a property's income covers its mortgage payment. It's a standard requirement for investment-property financing.

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What this calculator does

DSCR compares a property's net operating income to its annual mortgage payment. A ratio of 1.0 means income exactly covers the loan with nothing left over; most lenders want a cushion above that, often 1.2 to 1.25 or higher, before approving an investment-property loan.

The formula

DSCR = Net Operating Income ÷ Annual Debt Service

Net operating income is annual rental income minus annual operating expenses, before the mortgage. Annual debt service is your yearly principal-and-interest total for the loan you're evaluating.

Worked example

$160,000 loan at 6.5% / 30yr, $24,000 income, $9,600 expenses

Annual rental income$24,000
Annual operating expenses$9,600
Net operating income$14,400
Annual debt service$12,135.71
DSCR1.19

At 1.19, income covers the mortgage with about 19% to spare, below the 1.20-1.25 threshold many DSCR-loan programs require, so this deal would likely need a larger down payment or higher rent to qualify.

What is a good DSCR?

Debt service coverage ratio (DSCR) measures how many times a property's net operating income covers its loan payments. A DSCR of 1.0 means income exactly equals debt service with nothing to spare. Most lenders want to see at least 1.20 to 1.25, meaning income is 20% to 25% higher than the payment.

A higher DSCR means more cushion if rents dip or expenses rise, and it often unlocks better loan terms. Below 1.0 the property does not generate enough to cover its own financing, which is a warning sign for both you and any lender.

Frequently asked questions

Many lenders look for a DSCR of at least 1.20 to 1.25 on rental property loans, though requirements vary by lender and loan type. A higher ratio gives the lender confidence the property can cover its payment even if income dips, and may earn you a better rate.
Divide the property's annual net operating income by its annual debt service (the total of twelve months of principal and interest). A result of 1.25 means net operating income is 1.25 times the loan payment. This calculator does the math from your income, expenses, and loan terms.
A DSCR under 1.0 means the property's net operating income does not fully cover its loan payment, so you would need to feed it cash from elsewhere each month. Lenders rarely approve loans at that level, and it signals the deal may be overleveraged or underpriced on rent.
DSCR uses net operating income, which is gross rental income minus operating expenses such as taxes, insurance, and maintenance, but before the mortgage. That is then compared to the loan payment to see how comfortably the property covers its debt.