DSCR Loan Calculator
Investment-property DSCR (Debt Service Coverage Ratio) loans qualify the property, not the borrower. The lender asks: does NOI (Net Operating Income) cover annual debt service at the lender's required DSCR floor? This calculator answers two questions at once — does the deal qualify at the requested loan amount, AND what's the max loan supportable at the floor. Plus true APR over actual hold period (with origination points + lender fees amortized over years actually held, not the 30-year term) and prepayment-penalty cost. Cited to Fannie Mae Selling Guide §B6.
Qualifies at 1.20× floor (0.10× headroom)
Qualifies, but tight. Actual DSCR 1.30× vs floor 1.20× (only 0.10× headroom). Small NOI surprises (vacancy uptick, rent reset, expense inflation) can push the deal under-water on debt service. Consider lower loan or higher DSCR floor for cushion.
- Origination points
- $3,000
- Other lender fees
- $1,500
- Total upfront cost
- $4,500
- Prepay penalty (year-5 exit)
- $1,910
View the TypeScript implementation on GitHub: packages/calc/src/dscr-loan.ts · view tests
What this means
DSCR loans qualify the property, not the borrower. This unlocks investment-property financing for self-employed borrowers, portfolio investors above the Fannie Mae 10-property cap, and deals with non-traditional income (short-term rentals, commercial mixed-use). The trade-off is rate (typically 1-1.5% above conforming) and structure (often recourse on small residential, sometimes non-recourse on commercial).
Two questions this calculator answers in one pass: does the deal qualify at the loan you want? AND what's the max loan supportable at the lender's floor? The gap between the two reveals borrowing capacity. The true-APR calculation adjusts the headline rate for upfront points + fees amortized over your actual hold period (not the 30-year term), which materially changes the cross-product comparison.
Worked example
$24K NOI on a $200K loan at 8.5% / 30y produces ~$1,538/mo P&I → ~$18,460 annual debt service → DSCR ~1.30×. Qualifies comfortably at 1.20× floor. Max loan supportable at the floor: ~$216K. True APR over a 5-year hold with 1.5 origination points + $1,500 lender fees: ~8.74% (vs nominal 8.50%). Prepay penalty on year-5 exit per a standard 5-4-3-2-1 schedule: 1% of remaining balance ~$1,790. All-in cost-of-capital over the 5-year hold is meaningfully higher than the headline rate suggests — the operator-grade comparison across DSCR products is on true APR over hold, not nominal.
Frequently asked questions
The information and tools on this website are for general educational purposes only and do not constitute financial, investment, legal, or tax advice. Consult a licensed professional for decisions specific to your situation.