How to Calculate DSCR for a Rental Property (with Real Examples)
If you are shopping for a DSCR loan, the one number that decides whether your deal works is the DSCR itself. This post walks through the formula, three sanitized scenarios at different ratios, and the calculation mistakes that kill deals at the finish line. For the bigger picture on where DSCR fits in rental financing, start with the complete DSCR loan guide.
The formula in one sentence
DSCR (Debt Service Coverage Ratio) equals gross monthly rent divided by PITIA (principal, interest, taxes, insurance, and association dues). That is it. A ratio of 1.0 means the rent exactly covers the payment. A ratio of 1.25 means the rent covers the payment plus a 25% cushion. A ratio of 0.90 means the rent falls short of the payment by 10%, and somebody (usually you) has to cover the difference every month.
Every lender uses this core formula, but the definitions of rent and payment can drift between lenders, which is where new applicants get tripped up. More on that below.
Example 1: weak ratio (0.95)
A Jacksonville duplex listed around $220K. Both units rented at $975, so gross rent was $1,950 a month. You are putting 25% down and borrowing $165K at 8.25% on a 30 year DSCR product. Principal and interest comes in around $1,240. Florida taxes on a property like this ran about $250 a month. Insurance, which is not cheap in Florida in 2026, ran about $425 a month. No HOA. PITIA totaled $1,915.
DSCR on that deal was $1,950 divided by $1,915, which gives you 1.02. Technically qualifying at most DSCR lenders, because it crosses the 1.0 line. But it is a knife edge. If insurance reprices by $50, or if one unit goes vacant for a month, or if the 1007 rent schedule from the appraiser comes back at $925 instead of $975, the deal drops below 1.0 and dies.
I passed on that one. The ratio was too thin to absorb normal operational surprises.
Example 2: solid ratio (1.20)
A Birmingham single family with a long term tenant already in place. Purchase price around $150K, rent at $1,400. 20% down, borrowing $120K at 7.75%. P&I came in around $860. Alabama taxes were light at around $95 a month. Insurance ran around $110. No HOA. PITIA totaled $1,065.
DSCR was $1,400 divided by $1,065, which gives you 1.31. Comfortable ratio. This deal has room to absorb a modest rent drop, a tax reassessment, and an insurance bump without falling below the 1.0 qualification line. The lender I used had a rate tier at 1.20 that shaved a quarter point off the rate, so crossing that threshold mattered for the cost of capital on the loan, not just the approval.
The pattern to notice is that low tax states (Alabama, Tennessee, parts of the Carolinas) tend to produce stronger DSCR ratios than high tax and high insurance states (Florida, Texas, coastal). You can have the same purchase price and the same rent and the ratio moves by 25 basis points just based on where the property sits.
Example 3: strong ratio (1.45)
A small Birmingham triplex with three units at $750, $800, and $850. Total gross rent of $2,400. Purchase price around $180K, 20% down, borrowing $144K at 7.75%. P&I around $1,030. Property taxes around $115 a month, insurance around $125. PITIA totaled $1,270.
DSCR was $2,400 divided by $1,270, which gives you 1.89. That is a very strong number. The property is carrying almost twice the required debt service coverage. The trade off on a deal like this is usually that the purchase price is low because the property needs work, or the neighborhood is thinner on tenant demand. In this case it was a little of both, so the strong ratio was compensation for higher vacancy risk and a bigger rehab reserve.
When you see a triplex or quad with a 1.8+ DSCR, do not assume the deal is free money. Look at the rent per door and compare it to Fair Market Rent in that ZIP. If the rent is significantly above FMR, the ratio might be flattering you, because a rent drop would pull the whole thing down.
The 5 calculation mistakes that kill deals
Using asking rent instead of the 1007 rent schedule. The lender will order an appraisal, and the appraiser fills out a separate form (the 1007) that establishes market rent for the subject property. That is the rent the lender will use, not what you underwrote the deal at. If you bid based on $1,500 and the 1007 comes back at $1,350, the lender recalculates your DSCR and the deal can die. Always run your numbers with a conservative market rent assumption, not the optimistic one.
Forgetting escrow components. PITIA is principal, interest, taxes, insurance, AND association dues. I have watched a borrower call me in a panic because they ran the numbers at $1,200 P&I and forgot that the property also had $180 a month in HOA. The DSCR flipped from qualifying to not qualifying the moment the lender plugged in the full PITIA.
Using gross rent without a vacancy adjustment when the lender expects one. Some lenders (rare, but they exist) use 75% of gross rent to bake in a vacancy allowance. Ask upfront which version your lender uses. The difference between 100% and 75% on a $2,000 rental is a $500 a month swing in the numerator, which moves your DSCR by 25 to 30 basis points.
Ignoring the rate lock window. DSCR rates move, and a rate you priced three weeks ago might be 50 basis points higher today. A 50 basis point rate move can flip a deal from qualifying to not qualifying on a thin DSCR. Lock early or build in a rate cushion in your underwriting.
Forgetting that reserves are per loan across the whole portfolio. This is not strictly a DSCR calculation issue, but it crushes deals at the finish line. More on this in the DSCR loan requirements checklist.
How DoorVault handles this
Running the DSCR math on one property is easy. Running it across a growing portfolio every month as taxes and insurance and rents move is a different problem. DoorVault pulls your current PITIA directly from the servicer statements and mortgage bills in your document inbox, pulls rent from your bank feed or property manager statement, and recalculates DSCR every time either side moves. When a property drops below 1.0, it shows up as a portfolio health flag on the dashboard the day it happens, not six months later when you are trying to refinance.
The DSCR calculator is the quickest way to sanity check a deal before you even apply. The loans dashboard is where you track DSCR across every property once you are past two loans. The deeper workflow is in tracking DSCR across a rental portfolio.
FAQ
Do I include property management fees in the DSCR calculation?
No. DSCR uses PITIA only, not full operating expenses. Property management, maintenance, and vacancy reserves are your problem, not the lender’s.
What if I pay cash for taxes and insurance instead of escrowing?
Most DSCR lenders require escrow on the loan, so the point is usually moot. For the DSCR calculation itself, the lender will include the monthly equivalent of taxes and insurance regardless of how you actually pay them.
Can I count tenant paid utilities toward rent?
No. Rent is rent. Utility reimbursements and lease incentives do not show up in the DSCR numerator.
Run your numbers in 60 seconds
Try the DSCR calculator to sanity check any deal before you pull a full loan application. For the complete operator guide to DSCR loans, go back to the pillar. Track every DSCR loan across your portfolio at https://doorvault.app.
