Step-by-step guide to calculating your debt service coverage ratio using
real rental property numbers. Learn the formula, what income counts,
what expenses lenders include in PITIA, and what ratio you need.
7 min read| Updated June 21,
2026|Reviewed by: NEXA Loan Review Team
DSCR = Monthly Rental Income ÷ Total Monthly PITIA.
PITIA includes Principal + Interest + Property Taxes + Insurance +
Association/HOA dues. If a property rents for $2,800/month and PITIA is
$2,400, the DSCR is 1.17 (2,800 ÷ 2,400). Most DSCR lenders require a
minimum of 1.00–1.25. The key detail: lenders use the appraiser's market
rent estimate, not your projected rent.
The debt service coverage ratio is one of the simplest metrics in real
estate finance — but small errors in what counts as income or expense
can shift your ratio by 0.10 or more, which may be the difference
between qualifying and getting denied.
DSCR = Monthly Rent ÷ Monthly PITIA
A DSCR of 1.00 means rent exactly equals payment. Above 1.00 =
cushion. Below 1.00 = shortfall.
What Counts as Rental Income in a DSCR Calculation
Lenders determine the "rent" number from one of two sources:
Existing rent roll: If the property is already
rented, the lender reviews the current lease agreements and rent
payment history.
Appraisal market rent (Form 1007): For purchases,
vacant properties, or when the existing rent appears below market, the
appraiser provides a market rent estimate based on comparable rentals.
This is the number most lenders use for DSCR.
Lenders do NOT use your aspirational rent number. They use the lower of
actual rent roll or the appraiser's market rent, often with a vacancy
factor applied.
What's Included in PITIA
PITIA is the total monthly housing obligation:
P — Principal (loan
paydown)
I — Interest (cost of
borrowing)
T — Property Taxes
I — Hazard Insurance
A — Association / HOA
Dues (if applicable)
Note: PITIA does NOT include property management fees, maintenance,
vacancy, or capital expenditures. Those affect your real-world cash flow
but are not part of the lender's DSCR calculation.
3 Real-World DSCR Calculation Examples
Example 1: Strong DSCR — Single-Family in Austin, TX
Purchase Price: $400,000 | Down: 25% ($100,000)
Loan: $300,000 at 7.0% | P&I: $1,996
Taxes: $500/mo | Insurance: $130/mo
PITIA: $2,626/mo
Market Rent: $3,200/mo
DSCR: 3,200 ÷ 2,626 = 1.22 ✓
Example 2: Borderline — Duplex in Cleveland, OH
Purchase Price: $250,000 | Down: 20% ($50,000)
Loan: $200,000 at 7.5% | P&I: $1,398
Taxes: $300/mo | Insurance: $140/mo
PITIA: $1,838/mo
Combined Rent (2 units): $1,900/mo
DSCR: 1,900 ÷ 1,838 = 1.03 ⚠️
Borderline. Some lenders require 1.00 minimum. Others require 1.15+.
This deal would need a larger down payment to reduce PITIA.
Example 3: Doesn't Qualify — Cash-Out Refi in Miami, FL
Value: $500,000 | Cash-Out at 75% LTV: $375,000 loan
Loan: $375,000 at 7.75% | P&I: $2,687
Taxes: $620/mo | Insurance: $280/mo
PITIA: $3,587/mo
Market Rent: $3,200/mo
DSCR: 3,200 ÷ 3,587 = 0.89 ✗
Below 1.00 — rent doesn't cover the payment. This deal would need less
cash out or a lower interest rate to work.
How Vacancy Factors Affect DSCR
Many DSCR lenders apply a vacancy factor — typically 5–25% — to the
gross rent before calculating DSCR. This is a conservatism measure. For
example, if the market rent is $3,000 and the lender applies a 25%
vacancy factor, the effective rent for DSCR is $2,250. That shift can
turn a 1.20 DSCR into a 0.90.
Not all programs apply a vacancy factor. Short-term rental DSCR programs
often apply higher vacancy assumptions (25%+) due to the seasonal nature
of Airbnb/VRBO income.
Common DSCR Calculation Mistakes
Using your target rent instead of market rent: The
appraiser's opinion controls. Get a rent survey before you go under
contract.
Forgetting HOA dues in PITIA: Condo and townhome
association fees add to the monthly obligation.
Using the seller's tax bill: Property taxes
reassess after purchase. Use the purchase price × local millage
rate.
Ignoring the vacancy factor: Even if the raw DSCR
looks good at 1.15, a 25% vacancy factor drops it below 0.90.
Frequently Asked Questions
Most use gross rent (before expenses like management, maintenance,
or vacancy). Some apply a vacancy factor to gross rent for
conservatism. The calculation is rent against PITIA only — not
against all operating expenses.
Lenders typically use the lower of actual rent roll or appraiser
market rent. If your existing lease is below market, that may hurt
your DSCR until the lease renews at market rate.
Generally no. DSCR lenders focus on residential rental income from
the dwelling units. Ancillary income like parking, laundry, or
storage fees is usually excluded or discounted heavily.
Yes — and this is one of the most common DSCR fixes. A larger down
payment reduces the loan amount, which reduces the P&I portion
of PITIA, improving the DSCR. Even 5% more down can shift a 1.10
DSCR to 1.18.
A calculator provides an estimate only. Final DSCR depends on the
appraiser's market rent, the actual interest rate at lock,
verified taxes and insurance, and any program-specific overlays.
Always submit a full scenario for a real review.
Disclaimer: This guide is for educational purposes
only. It does not constitute loan approval, a rate quote, a rate lock,
or a commitment to lend. All scenarios are subject to full underwriting
review, appraisal, and final approval. DSCR requirements vary by lender
and program.
Last Updated: July 12, 2026 |
Reviewed by: Matt Dean, NMLS #227603 · NEXA Mortgage
