Debt Service Coverage Ratio (DSCR)

The debt service coverage ratio is the number that decides whether a commercial mortgage gets approved, and it is the number that decides how much you can borrow. You calculate it by taking the property's net operating income, the NOI, and dividing it by the annual debt service, which is the total of principal and interest payments for the year. A 1.25x ratio means the property makes 25% more than the loan costs you. That is the whole thing. Every lender, every agency, every bridge lender uses this one ratio to size the loan, and if you cannot make the math work on paper, the property's actual cash flow does not matter. This formula, the minimums you will actually face, and how to turn a weak ratio into a bigger loan are covered.

The dscr formula is simple: net operating income divided by annual debt service. Net operating income is the property's gross rental income minus operating expenses: property management, insurance, property taxes, maintenance, utilities you pay. It is not the same as cash flow, because it ignores capital expenditures, tenant improvements, and loan payments. Annual debt service is the full year of mortgage payments, principal and interest, at the actual note rate. If you have a loan at 6% for 25 years, the monthly payment is $6,443, and the annual debt service is $77,316. The NOI must be at least $96,645 for a 1.25x ratio. The formula punishes you for borrowing short, because a 10-year term with a 25-year amortization schedule means the balloon payment is not in the debt service, but the refinance risk is real.

Take a small multifamily building, four units, purchased for $800,000. The rents bring in $90,000 a year. Operating expenses run $30,000: property taxes, insurance, utilities, maintenance, management at 8%. That gives you a net operating income of $60,000. Now price the loan: 75% loan-to-value, so $600,000 borrowed, at 6.5% for 25 years.Divide $60,000 by $48,636, and you get a 1.23x debt service coverage ratio. That is under the 1.25x minimum most agency lenders require. You have two options: put more equity down to lower the loan amount, or find a property with higher NOI.28x. That is the whole game: the ratio is the constraint, not the purchase price.

Most lenders publish a minimum of 1.25x, but they underwrite to 1.30x or 1.35x in practice. The reason is the appraiser's net operating income is often lower than the seller's pro forma, and the appraiser will stress the income by adding a vacancy factor and a management fee that the seller left out. The published agency minimum for Fannie Mae and Freddie Mac conventional multifamily loans is 1.25x at a 75% loan-to-value. The Small Business Administration uses a lower bar: the SBA cash-flow coverage ratio minimum is 1.15x for loans with terms longer than 12 months, which applies to both 7(a) and 504 loans. But the SBA includes all the business's debt service, not just the real estate, so a business with heavy equipment loans will fail the test even if the property itself is fine. A what is a good dscr answer depends on the lender type: 1.15x is the floor for SBA, 1.25x is the floor for agency, and 1.35x is what you should target to avoid a rejection at the last minute.

The dscr loan sizing math is the reverse of the formula. You start with the net operating income, divide it by the minimum debt service coverage ratio, and that gives you the maximum annual debt service the lender will allow. Then you divide that by the annual debt service per dollar of loan, which is a function of the interest rate and the amortization period. Here is the example. A property has NOI of $100,000. The lender requires a 1.25x ratio. Divide $100,000 by 1.25, and you get $80,000 in maximum annual debt service. At a 6% rate over 25 years, the monthly payment per $100,000 borrowed is $644. The annual payment per $100,000 is $7,728. […] Now check the loan-to-value limit: if the property appraises at $1,200,000 and the lender caps LTV at 75%, the max is $900,000. The lower number, $900,000, is the loan. The DSCR test is usually the binding constraint when interest rates are high, because a higher rate means a higher payment per dollar borrowed, which reduces the loan amount.

Loan-to-value and debt service coverage ratio are inversely related: a lower LTV, meaning more equity, can support a lower DSCR, and vice versa. […] But there is a third test that often binds harder than either: debt yield. […] It ignores the interest rate entirely. A 10% debt yield is a hard floor for commercial mortgage-backed securities lenders, regardless of whether the DSCR looks great. […] The DSCR might be 1.40x, but the debt yield is still 10%, and the CMBS lender will not move. The reverse is also true: a high DSCR from a low rate does not save you from a low debt yield. […] minimum, but you can change the net operating income. The fastest way is to raise rents to market rates, because the appraiser uses the current rent roll, not the potential rent. […] Cut operating expenses that the appraiser will count, like a property management fee that you do not actually pay, but be careful: the appraiser will add a market-rate management fee back in anyway. […] The other lever is the debt service side: a longer amortization schedule, say 30 years instead of 25, lowers the annual payment and raises the DSCR. But the balloon payment on a 10-year term is still there, and a lower payment does not change the refinance risk.

These loans are for 1-to-4 unit investment properties, and they carry higher rates than owner-occupied mortgages because the lender has no recourse to your personal tax returns. […] The dscr calculator on most lender sites will show you the payment, but it will not show you the refinance risk. Do the math at a 1.40x stress test and a 75% LTV before you commit.

Two failures kill more deals than anything else. […] Then the property value drops 10%, the loan-to-value is now 90%, and the balloon cannot be refinanced because no lender will touch a 90% LTV without mortgage insurance. The cause is not stress-testing the deal at a 1.40x DSCR and a 75% LTV with a fully amortizing payment. […] The cause is that debt yield ignores interest rates, so a low-rate loan can still fail the test. […]

Every commercial loan has prepayment protection in some form: a lockout, yield maintenance, or defeasance. A lockout is a period, usually two to three years, where you cannot prepay at all. Yield maintenance is a cash penalty equal to the present value of the interest the lender loses when you prepay and they have to reinvest at a lower rate. […] The cost difference is not trivial. If rates have dropped 200 basis points since you closed, yield maintenance can be 5% to 8% of the loan balance. The SBA 504 loan has its own prepayment penalty, which is usually a declining percentage of the balance, not yield maintenance. Before you sign, ask for the prepayment schedule in dollars, not just the rate. […] For SBA loans, 1.15x is the minimum, but you need to include all business debt, not just the real estate.

How does DSCR limit my loan amount? The lender divides your net operating income by the minimum DSCR to get the […] The result is the maximum loan from the DSCR test, which you compare against the loan-to-value limit and take the lower number.

Can I get a DSCR loan with no personal tax returns? Yes, that is the point of a dscr loan […] The lender uses the property's net operating income and your credit score, not your W-2s. […] A 10% debt yield is a hard floor for CMBS loans regardless of the DSCR.