How to Calculate DSCR: Formula, Worked Examples, Calculator

The DSCR formula

DSCR = gross monthly rent ÷ monthly PITIA. That is the entire calculation. Take what the property earns each month, divide it by what it costs to hold each month, and the number that falls out is the ratio lenders underwrite to. A property renting for $2,300 with a $1,960 payment has a DSCR of 1.17. Above 1.0, the property covers its own payment and qualifies for standard DSCR programs. Below 1.0, the deal routes to a different program instead of dying. Everything else on this page is just getting the two inputs right.

Both inputs hide a detail that changes the answer, so define them properly before you divide.

Gross monthly rent is the income side. Gross means before anything comes out. No vacancy haircut, no maintenance reserve, no management fee. Lenders divide the full rent number, which surprises investors who are used to running conservative cash flow models on their own deals.

Monthly PITIA is the cost side, and it is where most calculation errors live.

Notice what PITIA leaves out. Your personal income. Your other debts. Your day job. The formula never asks about you, which is the whole point of a DSCR loan in the first place.

Understanding PITIA

Where do the five numbers come from in the real world? Not from guessing, which is how most first attempts at this calculation go sideways.

Principal and interest. These arrive together, as one dollar figure on the loan quote your matched specialist presents. You do not build this number yourself. Before a quote exists, the calculator further down this page gives you a planning figure, and your specialist’s actual quote replaces it when the deal gets real.

Property taxes. Pull the annual bill from the county assessor’s website and divide by 12. Then check whether that bill survives the sale. In plenty of counties, the purchase triggers a reassessment at your price, and the seller’s comfortable old tax bill jumps. (Florida has a sharp version of this when a homestead exemption falls off at closing. Texas investors know the reassessment dance too.) Run your math on the post-sale number, not the listing’s number.

Insurance. Get an actual quote from an agent before you commit to the deal math. Honestly, this is the input I trust least in any quick estimate. Premiums swing hard on roof age, construction type, and zip code, and in coastal or hail-prone markets the real quote can double a lazy assumption.

Association dues. From the HOA docs or the condo association, counted in full. This is the number people forget. Forgetting it flatters the ratio, and flattered ratios die in underwriting.

Step-by-step calculation

Numbers on the table. Say you are buying a $300,000 single-family rental with 25% down.

1. Down payment: 25% of $300,000 is $75,000, leaving a $225,000 loan.
2. Principal and interest: the payment comes to $1,497 a month on this loan, per the quote your specialist presents.
3. Taxes: the county bill works out to $313 a month.
4. Insurance: the agent’s quote lands at $150 a month.
5. HOA: none. Detached house, no association.
6. Total PITIA: 1,497 + 313 + 150 = $1,960.
7. Rent: the appraiser’s rent schedule says $2,300 a month.
8. Divide: 2,300 ÷ 1,960 = 1.17.

The property earns 17% more than it costs to hold. In cash terms, $340 a month of margin. The ratio clears 1.0 with room to spare, so this file qualifies for standard programs without a single page of income documentation.

Now run it yourself. The calculator below loads with this exact deal, so the first thing you see is the 1.17 you just walked through.

Then break it. Drop the rent to $1,960 and watch the ratio hit exactly 1.00. Push the down payment up and watch it climb. Five minutes of bending this thing teaches the sensitivity better than any paragraph can. One note on the machinery: the widget runs a market-typical financing assumption behind the scenes, and your specialist’s actual quote sets the real payment when you have a live deal.

What is a good DSCR?

Above 1.0 is good. Above 1.25 is strong. And below 1.0 is not the end, which surprises almost everyone. Here is the scale used across this site, and roughly how lenders read it.

One thing to hold onto while you read that table: the ratio decides which programs your deal can access. That is all it decides. It is a gate, not a grade, and a 1.40 file and a 1.05 file walk through the same standard-program door.

The middle tier is where most working files live, and it is exactly what the Standard DSCR program was built for. The tier that rattles people is 0.75 to 0.99, because it reads like a rejection and is not one. And the bottom tier means a human needs to look at the file before anyone can say what fits, which happens more often than you would guess with rural properties, unusual property types, and rents the appraiser could not comp cleanly.

Three deals, three outcomes

Same formula, three endings. This is where the arithmetic turns into strategy.

Deal one: the 1.17. The $300,000 example above. Rent $2,300, PITIA $1,960, cash flow +$340 a month. Clean standard-program approval path, nothing to structure. Most deals in healthy price-to-rent markets look like this one.

Deal two: the exact 1.00. Same house, same $1,960 payment, but the rent schedule comes back at $1,960 instead of $2,300. DSCR: exactly 1.00. Cash flow: zero. The property covers itself to the dollar and not a dollar more. And it still qualifies for standard programs, because 1.0 is the bar, not 1.01. Tight, but it clears.

Deal three: the 0.95. A $400,000 property with 30% down, which is $120,000, leaving a $280,000 loan. The principal and interest payment comes to $1,863 a month on that loan, taxes run $417, insurance $150. Total PITIA: $2,430. The rent schedule says $2,300. DSCR: 0.95, and the property runs $130 a month negative. A conventional underwriter closes the folder right here. A DSCR specialist does not, because at 30% or more down, the No-Ratio DSCR program drops the ratio requirement entirely. Investors close deals like this on purpose: under-market rents they plan to raise, appreciation plays, properties they intend to reposition.

The lesson lives in deal three. A failing ratio is a structuring question, not a verdict. The formula tells you which conversation to have. It never tells you to walk away.

How to improve your DSCR

The ratio has exactly two moving parts, so every fix pushes one of them. Raise the income side, lower the payment side, or go where the arithmetic is friendlier to begin with.

Raise the income. If the lease is under market, the appraiser’s schedule can only help so much, since most lenders take the lesser of lease and market rent until the lease renews. The bigger income move is strategy-level: on properties in strong vacation markets, Short-Term Rental DSCR qualifies on projected STR income, which can run well past what a long-term tenant pays.

Lower the payment. Four levers, in rough order of power. A bigger down payment shrinks the loan and the payment with it. An interest-only period removes the principal slice from the qualifying payment, which lifts the ratio on the same rent. Shop the insurance, because two agent quotes on the same house routinely land hundreds of dollars apart per year. And appeal the tax assessment when the county’s number looks aggressive. Investors skip that last one because it feels bureaucratic, and it quietly works.

Pick a better market. Price-to-rent ratios are not evenly distributed. A $300,000 house rents for $2,300 in parts of Texas and Georgia and for a lot less in pricier coastal metros, and no amount of structuring closes that gap. If the ratio keeps failing on every deal you run, the market is the problem, not the formula.

Common mistakes

Five show up constantly. Four of them flatter the ratio, which sets you up for a worse surprise in underwriting.

1. Using net rent instead of gross. You run your personal model with vacancy and maintenance haircuts, then divide with that number. Lenders divide the gross. This is the one mistake that improves your position when corrected.
2. Forgetting the HOA. The A in PITIA. A $250 monthly fee on a condo can drag a 1.10 below break-even all by itself.
3. Using the asking rent. The listing agent’s “should rent for” number and the Zillow estimate are not underwriting inputs. The appraiser’s rent schedule is, and it frequently comes in lower.
4. Using the seller’s tax bill. Post-sale reassessment, covered above. Run the math on the tax number your purchase price triggers, not the one printed on the listing.
5. Guessing insurance in coastal and hail markets. A $150 monthly assumption meets an actual $340 quote and the whole ratio reprices. Get the real quote first.

Get the five inputs honest and the formula never lies to you. At that point the question stops being “what is my DSCR” and becomes “what does my DSCR qualify for,” which is what the requirements breakdown answers next. And if you want the full picture of how these loans compare to what your bank offers, the conventional comparison settles it.