How to Calculate DSCR on a Property (The 3-Minute Formula Every Investor Needs)

The “Uh-Oh” Moment That Sparked This Guide

Last month a first-time investor—James—sent me a deal:

“Ken, the seller wants to close in ten days. Does this cash-flow? Will the lender approve me?”

I asked one question:

“What’s the DSCR?”

Silence. Then… “What’s that?”

If you’ve ever felt that knot in your stomach, today’s for you. DSCR (Debt-Service Coverage Ratio) is the #1 metric most lenders use on rental properties. Nail this once, and you’ll know in minutes whether a deal flies or dies.


Step 1: Gather Two Numbers

  1. Annual Net Operating Income (NOI)
    Rental income – operating expenses (taxes, insurance, maintenance, management, vacancy).
  2. Annual Debt Service
    Total of 12 mortgage payments (principal + interest) + any escrowed taxes/insurance if they’re in the payment.

Step 2: Plug Into the Formula

DSCR=NOIAnnual Debt ServiceDSCR=Annual Debt ServiceNOI​

Easy, right? Here’s the magic: lenders love ≥ 1.00×. Some will go down to .90, but the sweet spot is 1.10+.


Step 3: Quick Real-World Example

  • 4-plex rents = $6,200/mo
  • Operating expenses = $1,900/mo
  • NOI = $6,200 – $1,900 = $4,300/mo → $51,600/yr

Mortgage quote: $3,350/mo → $40,200/yrDSCR=51,60040,200≈1.28DSCR=40,20051,600​≈1.28

Result: ✔️ Pass! Lender likely green-lights this loan.


Pro Tips That Keep Deals Alive

  • Raise Rents – Even $50/unit can bump DSCR over the line.
  • Buy Down Rate – A small point lowers payment, boosts ratio.
  • Cut Expenses – Self-manage or appeal property taxes post-close.

Why DSCR Sets You Free

Unlike conventional loans that dive into your W-2 income, a DSCR loan says, “Show me the property pays for itself.” That means:

  • Less paperwork for you
  • LLC ownership OK
  • Scale doors faster without hitting the dreaded “10-loan” limit

Ready to See How Real Investors Are Doing It?

I run a free Facebook group where we break down real deals, share lender contacts, and post step-by-step blueprints.

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Let’s get your next deal funded—the smart way.

– Ken Guzman, Mortgage Advisor NMLS1287517

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