How is DSCR calculated? For a residential rental property, the formula is simpler than it sounds: divide the property’s monthly rental income by its total monthly housing payment. That single number tells a lender, and you, whether the property earns enough to cover its own debt.
The DSCR Formula in Plain English
DSCR equals monthly rental income divided by monthly debt service. That’s the entire formula. The result is expressed as a ratio: a DSCR of 1.0 means the rental income exactly covers the payment, above 1.0 means the property generates more than it costs, and below 1.0 means the rent falls short of the full payment.
Investopedia – Debt Service Coverage Ratio (DSCR)
What Counts as Rental Income
For a purchase, lenders typically use the market rent, established through an appraiser’s rent survey, rather than an income figure you provide yourself. For a refinance on an already-rented property, actual lease income is often used, sometimes alongside a market rent comparison, depending on the lender.
What Counts as Debt Service (PITIA)
Debt service isn’t just the loan’s principal and interest. It includes the full monthly housing payment: principal, interest, property taxes, homeowners insurance, and any HOA dues, commonly abbreviated as PITIA. Using the full PITIA figure, not just principal and interest, is essential for an accurate DSCR calculation.
A Simple Worked Example
Say a rental property brings in $2,400 a month in rent, and its total monthly payment, principal, interest, taxes, insurance, and HOA combined, comes to $1,850. Dividing $2,400 by $1,850 gives a DSCR of 1.3, meaning the property generates 30% more income than it costs to carry each month. That 1.3 ratio would meet or exceed most lenders’ minimum threshold, which commonly falls between 1.0 and 1.25.
What a DSCR of 1.0, Above 1.0, and Below 1.0 Actually Means
A DSCR of 1.0 is breakeven, the rent covers the payment with nothing left over. Above 1.0 means the property cash flows, with more room the higher the ratio climbs. Below 1.0 means the rent alone doesn’t cover the full payment, which some non-QM programs still allow with a larger down payment or stronger reserves, though it represents a thinner margin for the investor.
How Lenders Use Market Rent vs. Actual Lease Income
This distinction matters more than most first-time DSCR borrowers expect. A property with a below-market lease in place might calculate differently than its true earning potential suggests, and a lender’s appraisal-based market rent figure can end up higher or lower than what a current tenant is actually paying. Understanding which figure your lender will use, before you run your own numbers, avoids a surprising gap between your expectation and the final calculation.
Mortgage Planner’s Perspective
DSCR is a simple formula, but getting the inputs right, the correct rent figure, the full PITIA payment, matters as much as the math itself. Running this calculation accurately before you make an offer is what tells you whether a property is actually financeable, not just appealing on paper.
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FREQUENTLY ASKED QUESTIONS
The Formula
Q: How is DSCR calculated for a rental property?
A: Divide the property’s monthly rental income by its total monthly debt service (principal, interest, taxes, insurance, and HOA dues combined).
Q: What DSCR do I need to qualify for a loan?
A: Most lenders look for a DSCR of 1.0 to 1.25 or higher. Some non-QM programs allow lower ratios with a larger down payment or stronger reserves.
What Counts in the Calculation
Q: Does DSCR use my actual rent or the market rent?
A: It depends on the situation. Purchases often use an appraiser’s market rent survey, while refinances may use actual lease income, sometimes alongside a market comparison.
Q: Is DSCR based on principal and interest only, or the full payment?
A: The full payment, commonly called PITIA: principal, interest, taxes, insurance, and any HOA dues. Using only principal and interest would overstate the property’s DSCR.
Q: What if my property’s DSCR comes out below 1.0?
A: Some non-QM programs still allow this with a larger down payment or stronger reserves, though it represents a thinner cash flow margin than a ratio above 1.0.
Texas Mortgage Plan – 50+ years of combined mortgage experience, serving homeowners and homebuyers across Flower Mound and the DFW Metroplex. Elizabeth Rose, NMLS 252686, CDLP® Certified Divorce Lending Professional | Shea Patton, Mortgage Advisor, NMLS #251397, Licensed Realtor. Texas Mortgage Plan is a d/b/a of Legacy Mortgage, NMLS #1759275 | Equal Housing Lender