Real Estate Investing Glossary

Debt Service Coverage Ratio (DSCR)

Last reviewed July 15, 2026

DSCR is net operating income divided by annual mortgage payments, showing how comfortably a property’s income covers its debt.

What is the debt service coverage ratio?

The debt service coverage ratio (DSCR) measures a property’s ability to pay its own mortgage. It divides net operating income by total annual debt service (principal plus interest). A DSCR of 1.25 means the property earns 25% more than its loan payments require; a DSCR below 1.0 means income cannot cover the mortgage and the owner must feed the property from other funds.

Lenders live by this ratio. Most investment-property lenders require a minimum DSCR of 1.20 to 1.25 at origination, and the ratio often caps how much you can borrow: if NOI is fixed, a higher required DSCR means a smaller maximum loan. Commercial and DSCR-loan underwriters size loans this way rather than from the borrower’s personal income.

For investors, DSCR is also a margin-of-safety gauge. A property at 1.5x coverage can absorb a vacancy or a tax increase without going cash-flow negative; a property at 1.05x is one bad month from trouble. Stress-testing DSCR with higher vacancy and today’s insurance quotes is a standard part of careful underwriting.

Formula

DSCR = net operating income (NOI) ÷ annual debt service (principal + interest)

Worked example

A rental produces $18,000 of annual NOI and its mortgage requires $1,200 per month, or $14,400 per year. DSCR = $18,000 ÷ $14,400 = 1.25, right at the minimum many lenders require.

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Frequently asked questions

What DSCR do lenders require?: Most investment-property and commercial lenders require a DSCR of at least 1.20 to 1.25, meaning income must exceed loan payments by 20% to 25%. Some DSCR-loan programs go as low as 1.0 (or even below, with pricing penalties), while conservative lenders on riskier asset types may require 1.35 or more. A higher required ratio effectively shrinks the loan the property can support.
Does DSCR use gross rent or net operating income?: True DSCR uses net operating income, rent minus operating expenses like taxes, insurance, management, and maintenance. Some residential DSCR-loan programs simplify by comparing gross rent to the full PITI payment instead; that version produces a more flattering number, so always confirm which definition a lender or seller is quoting.

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What is the debt service coverage ratio?

Frequently asked questions

What DSCR do lenders require?

Most investment-property and commercial lenders require a DSCR of at least 1.20 to 1.25, meaning income must exceed loan payments by 20% to 25%. Some DSCR-loan programs go as low as 1.0 (or even below, with pricing penalties), while conservative lenders on riskier asset types may require 1.35 or more. A higher required ratio effectively shrinks the loan the property can support.

Does DSCR use gross rent or net operating income?

True DSCR uses net operating income, rent minus operating expenses like taxes, insurance, management, and maintenance. Some residential DSCR-loan programs simplify by comparing gross rent to the full PITI payment instead; that version produces a more flattering number, so always confirm which definition a lender or seller is quoting.