When you finance an apartment building, the lender is less interested in your salary than in the building’s ability to pay the loan. The measure they use is the debt service coverage ratio, or DSCR. It often decides how large a loan you can get, which in turn decides how much cash you need to bring. Understanding it before you talk to lenders helps you judge whether a deal can be financed the way you plan.
Key takeaways
- DSCR = net operating income / annual debt service.
- Lenders set a minimum DSCR and a maximum loan-to-value; the stricter one limits the loan.
- Lenders use their own NOI, often lower than yours.
- Higher interest rates shrink the loan a building can support.
The formula
Divide the property’s annual net operating income by the annual loan payment, principal plus interest. A DSCR of 1.25 means the building earns 25% more than the loan payment. A DSCR below 1.0 means it does not earn enough to cover the payment on its own. Lenders typically set a minimum DSCR for apartment loans and will reduce the loan amount until the building meets it.
Working backwards to the maximum loan
Here is an example with made-up numbers. Suppose a building has an NOI of $160,000 and the lender requires a DSCR of at least 1.25. The maximum annual payment is $160,000 divided by 1.25, or $128,000. At a 6.5% interest rate on a 30-year schedule, that payment supports a loan of roughly $1.69 million. At 5.5% on the same schedule, it supports about $1.88 million.
| At 5.5% | At 6.5% | |
|---|---|---|
| NOI | $160,000 | $160,000 |
| Maximum payment at 1.25 DSCR | $128,000 | $128,000 |
| Supported loan (30-year schedule) | about $1,880,000 | about $1,690,000 |
| Price | $2,900,000 | $2,900,000 |
| Loan-to-value | about 65% | about 58% |
| Cash needed before closing costs | about $1,020,000 | about $1,210,000 |
The building did not change, but one percentage point of interest moved the required cash by roughly $190,000. If the lender’s maximum loan-to-value were 65%, both scenarios would stay within it, and DSCR would be the constraint that sets the loan.
Questions buyers ask about DSCR
Will the lender use my NOI?
Usually not exactly. Lenders underwrite their own NOI, typically with a minimum vacancy factor, a management fee even if you self-manage, and a reserve for replacements. Building your NOI the same way, as described in Net Operating Income: The Number Every Apartment Deal Starts With, avoids a smaller loan than you expected.
What if the DSCR is too low?
The options are a smaller loan and more cash, a lower price, or a different loan structure. Some loan programs offer interest-only periods, which lower the payment early on, but the payment rises when the interest-only period ends. Model both periods.
Does DSCR matter after closing?
Often yes. Many commercial loans include covenants that require the property to keep a minimum DSCR, and a refinance will be sized using the DSCR at that time. If rents grow more slowly than planned or expenses rise, the building may support a smaller loan when you refinance.
Is DSCR the same as cash flow?
No. A 1.25 DSCR means NOI is 25% above the loan payment, but you still have reserves and capital items to pay from that cushion. Cash-on-cash return, covered in Cap Rate vs. Cash-on-Cash Return: Which One Tells You More?, looks at what is actually left for you.
DSCR, loan-to-value and debt yield together
DSCR is not the only limit. Most lenders also set a maximum loan-to-value, the loan as a share of the lower of price or appraised value, and some look at debt yield, which is NOI divided by the loan amount. Each test produces its own maximum loan, and the lender offers the smallest of them. In periods of higher interest rates, DSCR tends to be the binding limit; when rates are lower, loan-to-value often is.
The appraisal matters here too. If the appraiser’s value comes in below your price, a loan-to-value limit applies to the lower number, and the loan shrinks even if the DSCR works. Leave room in your cash plan for that possibility, especially if your price relies on a lower cap rate than recent sales of similar buildings support.
Amortization and interest-only periods
The payment in the DSCR calculation depends on the rate and on the amortization schedule. A 30-year schedule has a lower payment than a 25-year one, so it supports a larger loan at the same DSCR. Interest-only periods lower the payment further for a time. Both help early cash flow, but both also mean slower loan paydown and more balance to refinance later. If a loan is interest-only at first, check the DSCR on the payment that applies once principal payments begin, not only the starting one.
Before you talk to a lender
Bring a clean rent roll, a normalized T12, your own budget and a capital plan. Ask each lender for their minimum DSCR, maximum loan-to-value, required reserves, rate, amortization, any interest-only period and prepayment terms. Then run your numbers at each lender’s terms and at a higher rate, as shown in Stress-Testing an Apartment Deal: Rates, Rents, Expenses and Exit.