What DSCR means
The debt service coverage ratio (DSCR) compares a property's net operating income to its annual debt service — the total mortgage principal and interest for the year. A DSCR of 1.25 means the property earns $1.25 of net income for every $1.00 of loan payment, leaving a 25% cushion. It is the single most important number in commercial and investment lending, because it tells the lender whether the building can pay its own mortgage from its own income, without the borrower having to top it up from elsewhere. Above 1.0 the property covers its debt; below 1.0 it does not.
Why 1.25 is the magic number
Most commercial and dedicated 'DSCR loan' lenders require a minimum DSCR of around 1.25, though some accept 1.20 or even 1.0 on stronger deals and others demand 1.30 or higher for riskier property. The cushion above 1.0 exists to absorb surprises — a vacancy, a repair, a rent dip — without the loan falling into distress. This calculator flags whether your figure clears the common 1.25 bar so you can see at a glance whether a deal is likely to qualify as structured, or whether you need a larger down payment or higher rent to get there.
How to improve a weak DSCR
If your DSCR comes in below the lender's threshold, you have a few levers. Raising net operating income helps — higher rent, lower expenses or reduced vacancy all lift the numerator. On the debt side, a larger down payment shrinks the loan and its payments, a longer amortisation lowers the annual payment, and a lower interest rate does the same. Buyers often solve a thin DSCR by putting more cash down. Because DSCR is built on NOI, tightening your expense estimates and rent assumptions honestly is the first step before restructuring the loan itself.
DSCR for you versus the lender
Lenders use DSCR to protect their loan, but it is just as useful to you as a safety gauge. A ratio comfortably above 1.0 means the property should keep paying its mortgage through normal ups and downs; a ratio near or below 1.0 means any hiccup could leave you covering the shortfall out of pocket. Read DSCR alongside cash-on-cash return, which shows your actual return, and stress-test it against a higher vacancy or rate to see how much margin you really have. These tools use standard, published real-estate formulas and the figures you enter. They are estimates for planning and comparison, not financial, investment or tax advice — run your own numbers and speak to a qualified professional before you buy.
Frequently asked questions
How is DSCR calculated?
DSCR = net operating income ÷ annual debt service. NOI is annual rent minus operating expenses; debt service is the yearly mortgage principal and interest. A result of 1.25 means income is 1.25× the loan payment.
What DSCR do lenders require?
Most commercial and DSCR lenders want a minimum of about 1.25, though some accept 1.20 or 1.0 on strong deals and others require 1.30+. This calculator flags the common 1.25 threshold.
What does a DSCR below 1.0 mean?
It means the property's net operating income doesn't cover its loan payments — you'd have to make up the shortfall from other funds. Lenders generally won't approve a loan with a DSCR under 1.0.
How can I raise my DSCR?
Increase net operating income (higher rent, lower expenses), put more money down to shrink the loan, extend the amortisation, or secure a lower interest rate — all of these improve the ratio.