DSCR is the property's gross rental income divided by its full monthly debt payment, and on a residential DSCR loan that payment means PITIA: principal, interest, taxes, insurance, and any HOA dues. A house that rents for $2,400 with a PITIA of $2,000 has a DSCR of 1.20. Most lenders want at least 1.00, many price their best terms starting around 1.20 to 1.25, and a growing number will go below 1.00 with a larger down payment and a rate adjustment. Your personal income never enters the calculation, which is the entire point of the product.
That is the formula. What actually decides whether your deal qualifies is which numbers the lender puts into it, and investors lose deals over those details far more often than over the arithmetic. Here is how it really works.
The formula, precisely
DSCR = monthly gross rent divided by monthly PITIA.
Worked example on a Middle Tennessee single family rental:
- Purchase price: $280,000
- Loan at 75% loan to value: $210,000
- Principal and interest at 7.5% on a 30 year amortization: about $1,469
- Property taxes: $175 per month
- Insurance: $140 per month
- HOA: $0
- PITIA: about $1,784
- Market rent: $2,150
- DSCR: 2,150 divided by 1,784 = 1.21
Notice what is not subtracted. Vacancy, maintenance, management fees, and capital reserves do not appear anywhere in a residential DSCR calculation. That surprises investors who come from commercial underwriting, where DSCR is built on net operating income after operating expenses. On a residential DSCR loan the lender is using gross rent against gross debt service, and the expense cushion is baked into the ratio threshold instead of itemized.
This is also why DSCR is not a measure of whether your deal is good. A 1.25 DSCR property with a failing roof and 20% annual turnover is a bad investment that qualifies easily. Underwrite the deal separately from underwriting the loan.
Where the rent number comes from, and why it is usually the fight
Lenders do not take your word for market rent. On a purchase of a vacant property, the number almost always comes from a Form 1007 single family comparable rent schedule prepared by the appraiser alongside the appraisal. On an occupied property, most lenders use the lesser of the lease amount and the appraiser's market rent estimate, which means an under market lease you inherited can sink an otherwise fine deal.
Things that move this number, in the order they usually matter:
- The 1007 comes in low. This is the most common reason a DSCR deal dies. Appraisers pull rental comps from a market that may not reflect what you can actually get post rehab.
- An inherited below market lease. If the tenant is paying $1,600 and market is $2,150, expect the lender to use $1,600.
- Short term rental income. Some lenders will underwrite documented short term rental revenue, often via a 12 month history or a market data report, and many will not touch it. This varies by lender more than almost any other input, so ask before you go under contract.
- Multi unit properties. Total gross rent across all units, with the appraiser's Form 1025 supporting it on two to four units.
The practical move is to give the appraiser rental comps yourself, in writing, at inspection. Bring three to five recent leases on comparable properties in the same submarket. You are not telling the appraiser what to conclude, you are making sure the good comps are in front of them.
Where the PITIA number comes from
Every one of these is a lever, and investors underuse all of them.
- Taxes. Underwriters use the assessed and reassessed figure, not last year's bill on a property that just resold. In counties where a sale triggers a reassessment, model the higher number before you commit.
- Insurance. This is the most controllable line on the sheet and the one people accept passively. A $600 annual premium difference is $50 a month, which on a $1,784 PITIA moves DSCR by roughly 0.03. Shop it. Landlord policies vary enormously.
- HOA dues. Included in full. A $250 monthly HOA is often the difference between a deal and no deal on a condo or townhome.
- Amortization and term. A 40 year term or an interest only period lowers the payment used in the calculation on lenders that allow it. Interest only in particular can lift DSCR meaningfully, at the cost of no principal paydown during that period.
- Loan amount. More down payment means a smaller payment and a higher ratio. This is the brute force fix and it always works.
What ratio you actually need
Guidelines differ by lender, and any specific number should be confirmed with whoever is quoting you. The general shape of the market looks like this:
- 1.25 and above: comfortable territory, best pricing tiers, most leverage available.
- 1.00 to 1.24: approvable at most DSCR lenders, with pricing that improves as the ratio climbs.
- Below 1.00: a real product at many lenders, generally with a lower maximum loan to value, a rate add, and sometimes reserve requirements. A property that cannot cover its own debt service is being financed on your balance sheet, so treat this as a deliberate choice rather than a workaround.
Ratio is one input among several. Credit score, loan to value, reserves, whether the property is vacant at closing, and whether you are buying in an entity all move terms alongside DSCR. Our DSCR loan page lays out where our program sits on each of those.
Five ways to fix a deal that comes in under
- Increase the down payment. Dropping from 80% to 70% loan to value on the example above takes the payment from roughly $1,566 to $1,371 in principal and interest, which lifts DSCR from about 1.16 to about 1.27. Always works, costs capital.
- Ask about interest only. Where available, it lowers the qualifying payment materially without changing your down payment.
- Reshop insurance. Fastest free improvement available, and it takes an afternoon.
- Fix the rent evidence, not the rent claim. If the 1007 came in low and you have real comparable leases proving otherwise, submit them through a formal reconsideration of value. Bring documentation, not opinion.
- Raise actual rent before you refinance. On a BRRRR, the rehab and the lease are the DSCR strategy. A completed rehab and a signed market rate lease at refinance beat every financial engineering trick on this list. That sequence is walked through in how hard money and DSCR work together on BRRRR deals.
The mistake that costs the most
Investors calculate DSCR at the purchase price and the rent they hope to get, then get to the closing table with an appraisal that used a different rent number and a tax figure that reassessed upward. The ratio moves from 1.22 to 0.98 and the terms change or the loan dies.
Run the calculation three times: at your assumptions, at 10% lower rent, and at the reassessed tax figure. If it still clears at the pessimistic version, you have a financeable deal. If it only works at your best case, you have a hope.
Where the acquisition side fits
DSCR is exit financing. It is what holds the property after you own it, which means it rarely helps you win the property in the first place. The purchase and the rehab usually run on short term capital, and the DSCR loan takes them out once the property is stabilized and leased.
That whole chain is what we finance. Short term acquisition and rehab capital on the front end, DSCR on the back end, and same day funding for double closings when the deal is a resale rather than a hold. If you want the broader picture of how each product fits a different point in a deal, start with the learn hub, or go straight to rehab loans if the property needs work before it can be leased.
Program guidelines, ratio thresholds, and pricing vary by lender and change over time. Confirm current terms with your lender before you write an offer.