How to Calculate DSCR (And the Number Lenders Actually Want)
By Brad Geisen
· 5 min read
In this article
DSCR is the ratio that decides whether a rental can carry its own mortgage. Lenders use it to price DSCR loans. Investors should use it for something more basic: to see whether the property pays the bank before it pays them.
The formula fits on one line. The trouble is that lenders and investors compute the inputs differently, and the difference can flip a deal from "qualifies" to "loses money." This post shows both versions on the same property.
The DSCR formula
DSCR = Net operating income ÷ Annual debt service
- Net operating income (NOI) is rent minus operating expenses, before the mortgage.
- Debt service is the total of principal and interest payments for the year (lenders often include taxes and insurance here instead of in NOI; the ratio comes out the same as long as each cost is counted once).
A DSCR of 1.00 means NOI exactly covers the loan: zero cash flow. 1.25 means NOI is 25% more than the payment. 0.90 means the property comes up 10% short every year and you make up the difference.
Worked example: DSCR at asking
The same $325,000 rental we use across the deal analysis series.
DSCR = $19,370 ÷ $18,706 = 1.04
The property covers its mortgage with a 4% cushion. One vacant month ($2,600) wipes out three years of that cushion. That is what 1.04 means in plain terms: it works until anything goes wrong.
Why lenders want 1.20 to 1.25
A lender's DSCR minimum is their estimate of how much can go wrong before the loan stops being paid. At 1.25, rent can fall 20% before NOI drops below the payment. At 1.04, rent can fall 4%.
Typical DSCR loan tiers look like this. Exact terms vary by lender and change often; treat these as shape, not quotes.
| DSCR | What it usually means |
|---|---|
| 1.25+ | Best pricing, highest LTV (often 75% to 80%) |
| 1.10 to 1.24 | Approved, slightly higher rate or lower LTV |
| 1.00 to 1.09 | Some lenders; larger down payment, rate bump |
| Below 1.00 | "No-ratio" programs only; 25% to 35% down, materially higher rate |
Our example at 1.04 falls into the third row at best. At the price that produces a 1.25 DSCR on these assumptions, $282,290, it moves into the first row. That $42,700 difference is the lender's cushion expressed as price.
Lender DSCR vs investor DSCR
Here is the part that catches people. Most DSCR loan programs do not deduct vacancy, maintenance, or reserves. They take gross rent (or the appraiser's market rent) and divide by PITIA: principal, interest, taxes, insurance, and association dues.
Run the same property both ways at a DSCR lender's typical terms: 75% LTV, 7.25% rate.
| Lender method | Investor method | |
|---|---|---|
| Income | $2,600 × 12 × (1 − 5% vacancy) = $29,640 | $19,370 NOI (after vacancy, maintenance, reserves) |
| Less taxes + insurance | −$7,150 | (already in NOI) |
| Available for debt | $22,490 | $19,370 |
| Debt service ($243,750 at 7.25%) | $19,954 | $19,954 |
| DSCR | 1.13 | 0.97 |
The lender sees 1.13 and may approve the loan. The investor's version says 0.97: after realistic maintenance and reserves, the property does not cover its payment. Both numbers are correct. They answer different questions. The lender is asking "will this loan probably get paid." You are asking "will this property pay me."
Underwrite on the investor version. Qualify on the lender version.
Run these numbers on a real property.
Check the DSCR on a property you are watching →Four ways to raise DSCR
DSCR has two inputs, so there are two families of fixes: raise NOI or lower debt service.
1. Borrow less. Each $10,000 less of loan at 6% removes about $720 of annual debt service.
| Loan-to-value | Loan | Debt service | DSCR |
|---|---|---|---|
| 80% | $260,000 | $18,706 | 1.04 |
| 75% | $243,750 | $17,537 | 1.10 |
| 70% | $227,500 | $16,368 | 1.18 |
A seller-carried second at 0% does the same thing without more of your cash: the bank sees a smaller first, DSCR rises, and the second's payment is small or deferred.
2. Lower the rate. At 5.5% instead of 6.0%, debt service on $260,000 falls to $17,716 and DSCR rises to 1.09. Assuming a seller's existing 3.25% loan (Subject-To) drops debt service to about $12,500 and DSCR jumps to 1.55. This is why rate is the biggest lever in creative finance.
3. Verify higher rent. If three comps support $2,750 instead of $2,600, NOI rises to $20,900 and DSCR to 1.12. Cheapest lever; check it first.
4. Lower the price. At $282,290 on these terms, DSCR is 1.25. Price is the lever the seller feels most and the one you should reach for last, after the others are on the table.
Common DSCR mistakes
Using gross rent as NOI. The lender may; you should not. Gross rent divided by debt service on our example is $31,200 ÷ $18,706 = 1.67, a number that describes nothing you will experience.
Forgetting that taxes reset. The seller's tax bill reflects their purchase price. Yours will reflect yours. A property showing 1.25 on the seller's $2,100 tax bill can drop to 1.15 on your $3,900 bill.
Computing DSCR on the first lien only when there is a second. A seller-carried second with payments is debt service. If the second is $48,750 at 5% interest-only, that is $2,438 a year, and a 1.27 DSCR on the bank first alone becomes 1.11 on all debt. Deferred or 0% seconds are the exception, which is exactly why investors ask for them.
Treating 1.00 as break-even in practice. At 1.00 the property covers principal, interest, taxes, insurance, and the operating expenses you modeled. It does not cover the water heater that fails in year two if you skipped reserves, or the two months of vacancy on a turnover. A DSCR of 1.00 with no reserve line is a DSCR of 0.90 in real life.
Ignoring interest-only periods. Some DSCR loans offer 5 or 10 years interest-only, which inflates the ratio at the start. Underwrite on the amortizing payment too, because that is the payment you will be making when the interest-only period ends.
DSCR in the Deal Gap
DealGapIQ computes an investor-method DSCR for every strategy and uses a DSCR threshold as one of the return tests behind the Target Buy. When a property's Deal Gap is driven by DSCR rather than cash-on-cash, the workbench says so, because the fix is different: DSCR problems are debt problems, and debt problems have financing solutions.
For which lenders use which method, and how DSCR loans compare with hard money for a purchase, see hard money vs DSCR loans. For stacking a DSCR loan with a seller-carried second, see the Morby Method.
Quick reference
- Formula: NOI ÷ annual debt service
- Break-even: 1.00
- Lender comfort: 1.20 to 1.25
- Investor comfort: whatever survives one vacant month and one roof; 1.25 is a reasonable floor
- Biggest lever: interest rate, then loan size, then rent, then price
We analyze. You decide. Not financial, legal, or investment advice. Lender terms are illustrative; confirm with the lender in the directory.
Frequently asked questions
- What DSCR do lenders require?
- Most DSCR lenders want a minimum of 1.20 to 1.25 for their best pricing, meaning net operating income covers the loan payment with a 20% to 25% cushion. Some will lend down to 1.00 or even 0.75 with a larger down payment and a higher rate. Below 1.00 the property does not cover its own debt from rent, and the lender is underwriting your reserves, not the property.
- Does DSCR include vacancy and maintenance?
- Lender DSCR usually does not. Most DSCR loan programs compute the ratio from gross rent (or a market rent appraisal) against principal, interest, taxes, insurance, and HOA dues, with no deduction for vacancy, maintenance, or reserves. Investor DSCR, the one you should use to decide whether to buy, subtracts those. The same property can show a 1.13 lender DSCR and a 0.97 investor DSCR.
- How do you raise DSCR on a deal?
- Four levers: lower the loan amount with a larger down payment or a seller-carried second, lower the rate, raise verified rent, or lower the price. Each $10,000 less of loan at 6% removes about $720 of annual debt service. On a property with $19,370 of NOI, moving from 80% to 70% loan-to-value lifts DSCR from 1.04 to 1.18.
- Is DSCR the same as cash flow?
- They measure the same gap differently. Cash flow is NOI minus debt service in dollars; DSCR is NOI divided by debt service as a ratio. A DSCR of 1.00 is zero cash flow. A DSCR of 1.25 on $18,706 of debt service is about $4,700 of annual cash flow. Lenders prefer the ratio because it is comparable across loan sizes.
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Written by
Founder of DealGapIQ. Previously founded Foreclosure.com and built HomePath.com for Fannie Mae and HomeSteps.com for Freddie Mac. 35+ years in real estate data.
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