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Real Estate Investor Toolkit

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.

Property + loan
Origination + true APR
Prepayment penalty schedule (% of balance)
Actual DSCR
1.30×

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.

Monthly P&I
$1,538
Annual debt service
$18,454
Max loan at floor
$216,756
True APR over 5y hold
8.95%
vs nominal 8.50%
Upfront + prepay penalty
Origination points
$3,000
Other lender fees
$1,500
Total upfront cost
$4,500
Prepay penalty (year-5 exit)
$1,910
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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.

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Frequently asked questions

See the financing & underwriting methodology — Fannie Mae conforming financing, DSCR loan structure, commercial financing thresholds with primary-source citations.

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Founder & Editor, Bedrocka Tools

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.