DSCR basics
How to calculate DSCR on a rental property, step by step
Quick answer
DSCR equals the monthly rent divided by the full monthly payment (principal, interest, taxes, insurance and HOA dues, called PITIA). A result of 1.00 means the rent exactly covers the payment; above 1.00 leaves a cushion. Use the rent a lender will actually accept and real tax and insurance figures, or the number will mislead you.
The formula in one line
Debt service coverage ratio = gross monthly rent ÷ monthly PITIA. That is it. Most of the work is not the division; it is getting the two inputs right. If you put in an optimistic rent and forget the insurance, you will get a beautiful number that no underwriter will ever see.
Commercial real estate often calculates DSCR from net operating income, after vacancy and operating expenses. Most residential DSCR programs for one-to-four unit rentals use the simpler gross-rent-over-PITIA version described here. Some small-balance commercial programs for five or more units lean toward the net version, so ask which one a given lender uses before you compare results.
Step 1: pick the rent a lender will actually use
This is where most self-calculated ratios go wrong. Lenders do not use the rent you hope to get. They use one of three things, and some use the lower of two of them.
- The current lease, if the property is rented. Expect a copy, and sometimes proof the tenant is actually paying.
- The appraiser's market rent estimate. On most one-to-four unit appraisals, the appraiser completes a rent schedule comparing your property to similar rentals.
- For short-term rentals, booking history or a short-term rental data report, whichever the lender accepts.
When a lease and a market estimate disagree, many lenders take the lower figure. Some will use a higher lease if you can document a history of receipts. When I run a scenario for someone, I run it at the conservative number first so there are no surprises when the appraisal comes back.
Step 2: build the full payment, not just principal and interest
PITIA has five parts. Leave one out and the ratio is wrong.
Principal and interest
This is the loan payment itself. It depends on the loan amount, the interest rate you are quoted and the amortization period. Some DSCR programs offer an interest-only period; whether a lender qualifies you on the interest-only payment or the fully amortizing one varies, so ask.
Taxes
Use the actual annual tax bill divided by twelve. On a purchase, the seller's current bill may not be what you will pay after the sale, especially in places that reassess on transfer or tax non-owner-occupied property differently. Look up how your county handles it.
Insurance
A landlord policy, not a homeowner policy, plus flood insurance if the property is in a mapped flood zone and any separate wind coverage the area requires. Insurance has been the most common surprise in the files I see; get a real quote early.
HOA or association dues
Monthly dues for condos, townhomes and planned communities. Special assessments can matter too.
Step 3: divide, then read the result
Single-family example
Rent the lender will use ................ $1,850
P&I (as quoted) ......................... $1,180
Taxes ($2,640 / 12) ..................... $220
Insurance ($1,080 / 12) ................. $90
HOA ..................................... $35
PITIA ................................... $1,525
DSCR = 1,850 / 1,525 = 1.21
Rough way to read the result: below 1.00, the rent does not cover the payment and your options narrow; 1.00 to about 1.20 is workable with many programs; above roughly 1.20 to 1.25, wholesale lenders tend to compete harder for the file. Those bands are general patterns I see when shopping, not rules, and every lender draws its lines a little differently.
Running it across several units
For a duplex, triplex or fourplex, add every unit's rent together and divide by the single payment on the building. A vacant unit is usually counted at market rent from the appraisal. The method does not change; there are simply more lines in the rent column.
Duplex example
Unit A $1,300 + Unit B $1,250 ........... $2,550
PITIA ................................... $2,040
DSCR = 2,550 / 2,040 = 1.25
Three mistakes that throw the number off
Using an aspirational rent
The listing that rented for the most on your street last summer is not your market rent. An appraiser will look at several comparable rentals and pick a supportable number.
Using the seller's tax bill
If the property was owner-occupied with an exemption, or the county reassesses on sale, your bill can be noticeably higher after closing.
Guessing at insurance
Coastal, wildfire and older properties can carry insurance costs that swing the ratio by a meaningful amount. A real quote takes a day; a wrong guess can sink a closing.
Working backward: the maximum payment the rent supports
You can flip the formula to find how much payment a given rent will support at a target ratio. Divide the rent by the target. With $1,850 of rent and a target of 1.20, the maximum PITIA is about $1,542. Subtract taxes, insurance and HOA ($345 in the example above) and you are left with roughly $1,197 for principal and interest. Then you know the loan size to aim for at whatever pricing you are quoted.
That reverse calculation is how I size a refinance or decide what down payment makes a purchase work. The DSCR calculator on this site does the forward version instantly, and you can nudge the loan amount until you hit the ratio you want.
Frequently asked questions
What is a good DSCR for a rental property?
Many wholesale lenders are comfortable at 1.00 and above, and pricing and terms usually get better as the ratio climbs past roughly 1.20 to 1.25. There is no universal cutoff, which is why I compare several lenders.
Does DSCR use gross rent or net operating income?
Most residential DSCR programs for one-to-four unit rentals use gross monthly rent divided by PITIA. Some commercial programs for five or more units use net operating income instead. Ask which method applies.
Is HOA included in the DSCR calculation?
Yes. HOA or association dues are part of PITIA, the full monthly payment that the rent is measured against.
Can I get a DSCR loan below 1.00?
Sometimes. Some wholesale lenders consider coverage below 1.00 with stronger credit, more reserves or a lower loan amount. The menu is narrower, but it is not always a dead end.
Educational content, not a loan offer. Requirements vary by wholesale lender and change over time. Business-purpose loans for non-owner-occupied investment property only.