A DSCR calculator answers one question a rental lender cares about more than your paycheck: does this property earn enough to cover its own loan payment? Debt service coverage ratio (DSCR) divides a property's net operating income by its annual debt service, and it is the single number that decides whether a DSCR loan gets approved. A ratio of 1.0 means the property breaks even on its mortgage. Most lenders want to see 1.25 or higher.
This guide covers the DSCR formula, what counts as a good DSCR, what lenders require, and how DSCR loans let investors qualify on the property's income instead of their own.
What is the debt service coverage ratio?
The debt service coverage ratio measures whether a rental property produces enough income to pay its debt. It compares the money the property generates after operating costs against the mortgage payments that property carries.
DSCR = Net Operating Income ÷ Annual Debt Service
Net operating income (NOI) is rental income minus operating expenses, before the mortgage. Annual debt service is the total of principal and interest payments for the year. The ratio that comes out tells a lender how much cushion exists between what the property earns and what it owes.
A DSCR of 1.25 means the property earns $1.25 for every $1.00 of debt payment. That extra $0.25 is the lender's margin of safety against vacancy, repairs, and rising costs.
The DSCR formula
The DSCR formula has two inputs, and getting either one wrong changes the answer.
DSCR = NOI ÷ Debt Service
where:
NOI = Gross Rental Income − Operating Expenses
Debt Service = Annual Principal + Interest payments
Operating expenses include property taxes, insurance, management, maintenance, and vacancy. They do not include the mortgage itself, because the mortgage is the thing you are measuring against. If you fold debt into NOI, the ratio collapses and the number means nothing.
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How to calculate DSCR: a worked example
Take a single-family rental renting for $2,400 a month. Here is the full path from rent to ratio.
| Line item | Monthly | Annual |
|---|---|---|
| Gross rent | $2,400 | $28,800 |
| Vacancy (6%) | −$144 | −$1,728 |
| Property taxes | −$250 | −$3,000 |
| Insurance | −$100 | −$1,200 |
| Maintenance & repairs | −$150 | −$1,800 |
| Property management (8%) | −$192 | −$2,304 |
| Net Operating Income | $1,564 | $18,768 |
Now the financing. A $300,000 loan at 7.25% on a 30-year term costs about $2,046 a month, or $24,552 a year, in principal and interest.
DSCR = $18,768 ÷ $24,552 = 0.76
A DSCR of 0.76 means the property does not cover its own loan. The rent falls short of the payment by nearly a quarter. As structured, most DSCR lenders would decline this deal or require a larger down payment to shrink the debt service until the ratio clears their minimum.
If the same property carried a $230,000 loan instead, annual debt service drops to about $18,824, and the DSCR rises to roughly 1.00. Push the loan down further or raise the rent, and the deal starts to work.
What is a good DSCR for a rental property?
A good DSCR depends on the lender, but the benchmarks are consistent across the market.
| DSCR | What it means | Lender view |
|---|---|---|
| Below 1.0 | Property loses money on debt | Decline, or large down payment required |
| 1.0 – 1.10 | Breaks even, thin cushion | Possible, often higher rate or reserves |
| 1.20 – 1.25 | Standard approval zone | The common minimum |
| 1.25 – 1.50 | Comfortable margin | Strong approval, better terms |
| Above 1.50 | Strong cash flow | Best rates and terms |
Most DSCR lenders set 1.25 as the floor. Some will go to 1.0 or even fund slightly below 1.0 with compensating factors like a larger down payment, cash reserves, or a higher interest rate. The higher your ratio, the more negotiating room you have on rate and terms.
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Start Analyzing — FreeWhat is a DSCR loan?
A DSCR loan is an investment property mortgage that qualifies the borrower on the property's income rather than the borrower's personal income. There is no W-2, no tax-return income calculation, and no debt-to-income ratio on the borrower. The property's debt service coverage ratio is the qualification.
This is why DSCR loans grew so fast among investors who are self-employed, who write off income on their tax returns, or who already carry several mortgages that would sink a traditional debt-to-income calculation. If the rental covers its payment with the cushion the lender wants, the loan can close.
The tradeoff is cost. DSCR loans usually carry interest rates a point or more above owner-occupied mortgages, and they often require 20 to 25 percent down. The lender accepts the property's income as qualification and prices that flexibility into the rate.
DSCR loan requirements
Requirements vary, but most DSCR lenders check the same things.
- Minimum DSCR, usually 1.0 to 1.25 depending on the lender and the rate
- Down payment of 20 to 25 percent, sometimes more for a low ratio
- Credit score, commonly 660 or higher, with better scores unlocking better terms
- Cash reserves, often three to six months of payments
- An appraisal with a market rent schedule (the 1007 form) that supports the rent used in the ratio
- Property type within the lender's box, typically 1 to 4 units, sometimes small multifamily
The market rent schedule matters. Lenders use the appraiser's rent estimate, not your optimistic number, so a ratio built on inflated rent will not survive underwriting. Run your DSCR on a defensible rent figure before you apply.
DSCR vs. other rental metrics
DSCR answers a financing question. It does not tell you whether a deal is a good investment on its own. Pair it with the metrics that measure return.
| Metric | What it measures | Whose question it answers |
|---|---|---|
| DSCR | Income vs. debt payment | The lender's: will this loan get paid? |
| Cap rate | Return on property value, unlevered | The market's: what is this property worth? |
| Cash-on-cash return | Return on cash invested | Yours: what does my money earn? |
| Net operating income | Income after operating costs | The foundation all three are built on |
A property can clear a 1.30 DSCR and still be a mediocre investment if your cash-on-cash return is weak. DSCR gets you the loan. The other metrics tell you whether you should want it. This is the same NOI that drives cap rate, so accurate operating expenses feed every number at once.
Limitations of DSCR
DSCR is a snapshot, and a few things can distort it.
The ratio is only as honest as the NOI behind it. Understate vacancy or skip a property management line, and the DSCR looks stronger than the property really is, right up until reality catches up. Lenders know this, which is why they verify rent with an appraisal and often impose their own expense assumptions.
DSCR also ignores appreciation, tax benefits, and principal paydown. A deal with a 1.0 DSCR that breaks even on paper may still build wealth through equity and appreciation over time. The ratio measures debt safety, not total return, so a thin DSCR is a financing constraint, not automatically a bad deal.
Finally, the ratio moves with rates. The same property that cleared 1.25 at a 6.5% rate can fall below 1.0 when rates climb, because debt service rises while rent stays put. Stress-test your DSCR against a higher rate before you commit.
Calculate DSCR on your next deal
Run the full picture, NOI, DSCR, cash flow, and cash-on-cash return, with our free property analysis tool. Enter the rent, expenses, and loan terms once, and see whether the deal clears the ratio your lender wants before you ever fill out an application.
DSCR gets you the loan. To see whether the deal is worth financing, read our guides on cap rate, cash-on-cash return, and how to analyze a rental property.