Insights / How DSCR Is Calculated on a Rental Purchase (Exact Formula)
September 25, 2026
How DSCR Is Calculated on a Rental Purchase (Exact Formula)
DSCR stands for debt service coverage ratio, and on a rental purchase it's calculated by dividing the monthly rent by the monthly PITIA payment on the property. A DSCR of 1.0 means the rent exactly covers the payment; most DSCR lenders want to see something between 1.0 and 1.25 before they'll approve the loan. The rent number itself can come from either the appraiser's market rent opinion (Form 1007) or an existing signed lease, and which one a lender uses can change your ratio.
DSCR loans get judged by the property, not your paycheck, and that's exactly why the formula matters more here than it does on a conventional purchase. Once you know the two inputs, you can run the math yourself before you ever talk to a loan officer, using the same logic our DSCR calculator applies behind the scenes.
What is the exact DSCR formula?
DSCR = monthly gross rent ÷ monthly PITIA. That's it. No adjustments for vacancy, no subtracting management fees, no factoring in your other properties or your W-2 income. The ratio is a single number that describes whether the subject property's rent, by itself, covers the subject property's housing payment.
If the rent comes in higher than the PITIA, your DSCR is above 1.0. If the rent comes in lower, it's below 1.0. A ratio of exactly 1.0 means the rent covers the payment dollar for dollar, with nothing left over for taxes, insurance increases, or a vacant month.
What counts as PITIA in the denominator?
PITIA is principal, interest, taxes, insurance, and association dues. On a rental purchase, that means your underwriter builds the denominator from:
- Principal and interest on the new loan at the proposed rate and term
- Property taxes, estimated from the purchase price and local tax rate
- Homeowners insurance, based on the actual or estimated premium
- HOA dues or condo association fees, if the property has them
Notice what's missing: there's no line for your car payment, your student loans, or your other mortgage's payment. That's the core difference from a debt-to-income calculation, and it's why a DSCR loan can work for a self-employed borrower or a real estate investor whose personal tax returns don't show much taxable income.
Do lenders use market rent or my signed lease?
Both, depending on the situation. If the property already has a tenant in place, most lenders will accept the signed lease amount as the rent figure. If the property is vacant, listed for sale by an owner-occupant, or you simply don't have a lease yet, the lender leans on the appraiser's opinion of market rent, reported on Form 1007 (the Single-Family Comparable Rent Schedule).
When both exist, meaning there's a current lease and the appraiser also completed a 1007, some lenders will use whichever number is lower and some will use the actual lease. This isn't standardized across the DSCR market the way conventional guidelines are standardized by Fannie Mae or Freddie Mac, so it's worth asking your loan officer which rule your specific lender applies before you rely on a number to size up the deal.
What DSCR ratio do lenders want to see?
A ratio between 1.0 and 1.25 is typical for DSCR programs, though the exact requirement varies by lender and by how the rest of the file looks (credit score, down payment, property type, reserves). Here's roughly how the ranges tend to play out:
| DSCR ratio | What it means | Typical lender response |
|---|---|---|
| Below 1.0 | Rent doesn't fully cover PITIA | Often still fundable, but usually with a larger down payment, stronger reserves, or pricing adjustments |
| 1.0 to 1.25 | Rent covers or modestly exceeds PITIA | The most common approval range across DSCR programs |
| Above 1.25 | Rent comfortably exceeds PITIA | May open up more competitive pricing or lower down payment options |
A sub-1.0 DSCR isn't automatically a decline. It just means the underwriter is going to lean harder on your reserves and credit profile, because the property alone isn't proving it can carry itself.
How is DSCR different from DTI on a conventional loan?
Debt-to-income (DTI) is a borrower-level calculation: your total monthly debts divided by your total monthly income, including whatever the new mortgage payment does to that ratio. It's the backbone of conventional loans and most agency-backed programs, and it requires documenting your income with tax returns, W-2s, or pay stubs.
DSCR flips that entirely. It's a property-level calculation that ignores your personal income altogether. That's the whole appeal of the DSCR program on the Non-QM pillar: a borrower who owns rental property through an LLC, writes off heavily on Schedule E, or simply doesn't want to hand over two years of returns can still qualify based on what the property itself produces in rent.
Does DSCR change based on how I hold title or finance the deal?
The ratio itself doesn't care about title vesting, but your loan terms do feed the PITIA side of the formula, so anything that changes your rate, your down payment, or your loan amount changes your DSCR. A larger down payment lowers the loan amount, which lowers principal and interest, which raises your DSCR. A higher rate does the opposite. This is why running the numbers on a DSCR calculator before you make an offer matters: two purchase prices that look similar on paper can produce noticeably different ratios once financing terms are applied.
A real scenario
A client came to us on a single-family rental purchase where the seller had a tenant in place on a signed lease, but the rent on that lease was set well below what similar rentals in the neighborhood were commanding. The appraiser's Form 1007 came back with a market rent figure meaningfully higher than the lease.
The lender we placed the loan with used the lower of the two figures, since the lease was in force and the tenant had no plans to leave, so we sized the deal using the lease amount rather than the market rent opinion. That produced a lower DSCR than the borrower had assumed going in, and it changed the loan amount they qualified for. The lesson: know which rent figure your lender applies before you get attached to a purchase price, because assuming market rent when the lender will use the lease can leave you short at the finish line.
If you're evaluating a rental property purchase and want to see how the ratio moves under different assumptions, run your numbers past a loan officer early rather than after you're under contract. A quick call to our team before you write an offer can save a renegotiation later.
Frequently asked questions
What is a good DSCR for a rental property?
A DSCR between 1.0 and 1.25 is typical for approval across most DSCR programs, though the specific minimum depends on the lender and the rest of your file. Higher ratios generally open up better pricing and lower down payment requirements.
Do DSCR loans use my personal income?
No. DSCR loans qualify the property based on its rent covering its own PITIA payment, not your personal debt-to-income ratio. That's the core difference from conventional financing, which relies on documented personal income.
Can I use a signed lease instead of market rent?
Yes, if the property already has a tenant in place, most lenders will accept the signed lease amount. If the property is vacant or you don't have a lease yet, the lender uses the appraiser's market rent opinion from Form 1007 instead.
What is PITIA in a DSCR calculation?
PITIA stands for principal, interest, taxes, insurance, and association dues. It's the full monthly housing payment used as the denominator in the DSCR formula, and it excludes your other personal debts.
What happens if my DSCR is below 1.0?
A DSCR below 1.0 means the rent doesn't fully cover the PITIA payment, but it doesn't automatically disqualify you. Lenders often still approve the loan with a larger down payment, stronger reserves, or pricing adjustments to offset the shortfall.
Is DSCR the same as debt-to-income (DTI)?
No. DTI measures your personal monthly debts against your personal monthly income and is used on conventional and most agency-backed loans. DSCR measures a single property's rent against that property's own housing payment and ignores your personal income entirely.
Does a DSCR loan require tax returns?
Most DSCR programs don't require tax returns for income qualification since the property, not the borrower's income, drives approval. Lenders still review credit, reserves, and the property's rent documentation.
How do I calculate DSCR before making an offer?
Divide the expected monthly rent, either from a signed lease or an appraiser's market rent opinion, by the projected monthly PITIA at your expected rate and down payment. Our DSCR calculator runs this same formula so you can test different purchase prices and down payments before you commit to an offer.
Reviewed by Jesse Gonzalez, NMLS #278103
This article is for general information only and is not a loan approval, rate quote, or financial advice. Program guidelines change and every file is different, so talk to a licensed loan officer about your scenario. True Blue Lending Corporation, NMLS #2380218. Equal Housing Opportunity.