Debt Service Coverage Ratio (DSCR) Calculator
Enter your property income and loan details to calculate the Debt Service Coverage Ratio (DSCR). The calculator builds NOI from gross rental income, vacancy loss, and operating expenses, then computes annual debt service from your loan amount, rate, and term. It also solves in reverse: the minimum NOI needed for a 1.25x lender threshold and the maximum loan your income can support. Switch to "Enter NOI directly" if you already have a net operating income figure.
What is the Debt Service Coverage Ratio?
The Debt Service Coverage Ratio (DSCR) measures how many times a property's net operating income (NOI) covers its annual debt payments. A DSCR of 1.00x means the property earns exactly enough to pay its mortgage; a DSCR of 1.25x means it earns 25 percent more than required. Commercial lenders use this ratio as a primary underwriting metric because it directly answers the question: can this asset pay for itself? Unlike loan-to-value ratios, which focus on collateral, DSCR focuses on cash flow, making it the more forward-looking of the two.
How DSCR is calculated
The formula has two parts. First, net operating income: start with gross rental income, subtract a vacancy and credit loss allowance (typically 5-10%), add any ancillary income, then subtract all recurring operating expenses (property taxes, insurance, management fees, maintenance, and utilities). Mortgage payments are never included in operating expenses. Second, annual debt service: use the standard loan payment formula (PMT) to find the monthly principal-and-interest payment, then multiply by 12. Dividing NOI by annual debt service gives DSCR. Most lenders also check a "global DSCR" that adds the borrower's personal cash flow alongside the property figures to assess overall creditworthiness.
DSCR lending thresholds and what they mean
The industry standard minimum is 1.25x, meaning every dollar of debt service must be covered by 1.25 dollars of NOI. This 25 percent cushion absorbs short-term vacancy spikes or expense increases without triggering a payment default. Agency lenders (Freddie Mac, Fannie Mae multifamily) and SBA loans may use 1.20x-1.25x, while bridge lenders or value-add deals sometimes accept 1.10x-1.15x with strong sponsorship. Conduit (CMBS) loans targeting the secondary market are typically structured to 1.25x-1.30x. A DSCR above 1.50x is considered strong and usually qualifies for the best pricing and highest loan-to-value ratios.
Reverse-solve: maximum loan and minimum NOI
Two reverse problems come up constantly in deal underwriting. First: given a fixed NOI, what is the largest loan the property can support at a lender's threshold? Rearranging the DSCR formula gives maximum annual debt service = NOI / threshold, and a loan-payment formula inverts that into a principal balance. Second: given a fixed loan, how much NOI is required to clear the threshold? Minimum NOI = annual debt service x threshold. Both answers update live in this calculator as you adjust the lender threshold, rate, or term inputs.
DSCR thresholds and lender interpretation
| DSCR | Interpretation | Typical lender response |
|---|---|---|
| Below 1.00x | Below breakeven | Loan almost always denied |
| 1.00x - 1.19x | Weak coverage | High-risk; most lenders decline |
| 1.20x - 1.24x | Marginal | Borderline; may need mitigants |
| 1.25x | Minimum standard | Common floor for commercial loans |
| 1.25x - 1.35x | Adequate | Typically approved; limited flexibility |
| 1.35x - 1.50x | Good coverage | Solid; competitive terms available |
| Above 1.50x | Strong coverage | Preferred; best rates and LTV |
Standard commercial lending benchmarks. Specific requirements vary by lender, property type, and loan program.
Frequently asked questions
What is a good DSCR for a commercial property?
1.25x is the most common minimum floor set by commercial lenders, but a "good" DSCR depends on context. Stabilised multifamily deals typically target 1.25x-1.35x. Industrial and office assets often require 1.30x or higher due to lease rollover risk. A DSCR above 1.50x is considered strong and usually results in the best pricing; anything below 1.20x will struggle to find conventional financing.
Does DSCR include the mortgage payment?
No. The mortgage payment (principal and interest) is the "debt service" on the bottom half of the ratio, not an expense subtracted from income when calculating NOI. Operating expenses that go into NOI are things like property taxes, insurance, management fees, repairs, and utilities. Mixing debt service into the NOI calculation would understate the ratio.
How do lenders calculate the debt service for DSCR?
Most lenders use the actual monthly principal-and-interest payment (the PMT formula) multiplied by 12. Interest-only loans would use only the interest portion. Some lenders stress-test the DSCR by using a higher "underwriting rate" (often 25-50 basis points above the contract rate) to see whether coverage holds in a rising-rate environment.
Can I use DSCR for residential mortgages?
Yes. "DSCR loans" for 1-4 unit investment properties have become a popular product for real estate investors who do not qualify based on personal income. The lender qualifies the property on its own cash flow rather than the borrower's W-2 income, using the same NOI-to-debt-service logic. Typical minimum DSCR for these products is 1.0x-1.25x depending on the lender.
What is a global DSCR?
Global DSCR adds the borrower's personal income (after personal obligations) to the property's NOI in the numerator and includes all personal debt payments alongside the property debt service in the denominator. Lenders use it to make sure a borrower who owns multiple properties or carries significant personal debt is not overextended overall, even if each individual property passes its own DSCR test.
How can I improve a low DSCR?
The four levers are: increase income (higher rents, lower vacancy, add ancillary revenue), reduce operating expenses, lower the loan amount (larger down payment or more equity), or negotiate a lower interest rate or longer term to reduce monthly payments. Extending a 20-year amortisation to 30 years, for example, reduces annual debt service by roughly 10-15% and lifts the DSCR proportionally.