The DSCR calculation for a loan is a simple yet important calculation that investors need to understand. In short, it divides the monthly rent from property by the monthly loan payment plus taxes, insurance, and any HOA fee. You can run that math on a napkin, and once you understand what goes in each side of the equation you will stop being surprised by the number that comes back.
So let's build the calculator from scratch, and walk through the numbers so you'll be an expert when submitting your next deal.
The DSCR loan calculator formula
DSCR stands for debt service coverage ratio. Here's how it works:
DSCR = Monthly Rent ÷ PITIA
PITIA is principal, interest, taxes, insurance, and hoa fees. That is the full monthly expense for the property, not just the mortgage payment your amortization schedule shows. A DSCR of 1.00 means the rent exactly covers the carrying cost. Below 1.00 the property loses money every month before you have spent a dollar on repairs or vacancy. Above 1.00 it clears a cushion. We walk through the arithmetic in more detail in our guide to how the DSCR ratio is calculated, but the formula above is the entire engine.
Here is a worked example. Say you are buying a rowhome that rents for $1,800 a month.
Input | Monthly amount |
|---|---|
Principal + interest (on a $160,000 loan at 7.5%, 30-yr) | $1,119 |
Property taxes | $210 |
Insurance | $95 |
HOA | $0 |
Total PITIA | $1,424 |
$1,800 rent ÷ $1,424 PITIA = 1.26 DSCR. That deal prices well. It clears our floor with room to spare, and at 1.26 you are into the tier where the rate stops getting penalized.
What counts as rent in a DSCR calculation
This is where the online calculators lie to you. They let you type in whatever rent number you want. A lender uses the lower of two figures: the actual lease rent, or the market rent an appraiser assigns on a form 1007. If your tenant is paying $1,800 but the appraiser says market is $1,650, we underwrite to $1,650. So run your own calculator with the conservative number, not the hopeful one.
For a short-term rental the rule tightens further. Most DSCR lenders will not underwrite Airbnb projections. They want a 1007 long-term market rent, which in many cases is significantly less than what you actually brought in on the property. If your whole thesis depends on nightly rates, price the deal on the long-term number first and treat the upside as gravy. Some lenders will let you underwrite using Airbnb rents, but there are usually several other requirements including having owned the property for a full year and having at least 50% occupany.
What goes into taxes, insurance and HOA fees
For better or worse, DSCRs lenders overly simplify the expenses for a rental property. They only consider 3 expenses: taxes, insurance and HOA fees.
Insurance is climbing faster than most people budget. We wrote a whole piece on how rising insurance premiums quietly sink your DSCR, because a $95 quote can come back at $160 and drop a 1.20 deal under 1.00.
Flood and HOA. If the property carries a separate flood policy or association dues, both belong in PITIA. Leave them out and your calculator says yes on a deal the lender says no on.
Property taxes. These matter more than the current bill suggests, too. In a lot of jurisdictions the assessment resets on sale, so the taxes you inherit are not the taxes you will pay. Baltimore County is a good example, and if you are shopping there, DSCR lending in Baltimore County means underwriting to the reassessed number, not the seller's old one. Look up the millage rate and run the math on your purchase price.
What DSCR to aim for
The number you get out of the calculator does not just pass or fail. It lands you in a pricing tier. The general shape across the market looks like this:
DSCR | What it means for your loan |
|---|---|
Below 1.00 | Rent does not cover the payment. Limited lenders, lower leverage, rate bump. |
1.00 to 1.19 | Approvable at most shops, but you pay for the thin cushion. |
1.20 to 1.35 | The sweet spot. Best pricing and full leverage. |
1.35 and up | No further rate benefit in most cases, but plenty of margin for vacancy and repairs. |
The one thing to keep in mind is the the expenses for a DSCR loan do not actually represent all the true expenses for owning a property. There are repairs, turnover when a tenant moves out and vacancy. A portfolio of properties that DSCRs at 1.2 will many times break even. So as a practical guide, if your going to have properties that DSCR at 1.00, expect to be putting in extra cash into the deal every month.
Additionally, lower DSCRs require higher credit which we do break down seperately in our post on the credit score you need for a DSCR loan.
Three levers when your DSCR comes back too low
If the calculator hands you a 0.95, you are not dead. You have three moves:
Put more money down. A smaller loan means a smaller P&I, which shrinks the denominator and lifts the ratio. Dropping from 80% to 70% leverage often pushes a sub-1.00 deal over the line.
Buy the rate down. Points paid up front lower the interest portion of PITIA. On a marginal deal, one point can be the difference between a decline and an approval.
Switch to interest only. Many DSCR loans can be switched to interest only- where your payments are interest only for the first 10 years and then the loan switches to being fully amortized for the last 20 years. Although the payments will increase after 10 years, typically the rent will have increased as well and should cover the increased payment.
Run the calculator before you write the offer, not after you are under contract. The number tells you what you can borrow, and knowing it early keeps you from chasing a deal the debt will never support.
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Frequently asked questions
What is a good DSCR for a loan?
1.00 is the floor at most lenders, meaning rent exactly covers the loan payment plus taxes and insurance. The best pricing shows up at 1.20 and above, where you have a real cushion for vacancy and repairs.
Does the DSCR calculation use my actual rent or market rent?
Lenders use the lower of your actual lease rent or the market rent an appraiser assigns on a form 1007. Run your own numbers with the conservative figure, because that is what underwriting will use.
Is PITIA the same as my mortgage payment?
No. PITIA is principal, interest, taxes, insurance, and HOA dues combined. Your amortization schedule only shows principal and interest, so a calculator that leaves out taxes and insurance will overstate your DSCR.
Can I use Airbnb income for a DSCR loan?
Most DSCR lenders will not underwrite short-term rental projections. They want the long-term market rent from a 1007 appraisal, which can be far lower than peak nightly revenue. Price the deal on the long-term number first.
What if my DSCR comes back below 1.00?
You have three levers: put more money down to shrink the loan payment, buy the rate down with points, or raise the rent to market before you refinance. Any of the three can move a marginal deal into approval range.