How to Calculate DSCR for Investment Property: Step-by-Step Guide 2026

How to Calculate DSCR: The Formula Explained

DSCR Formula: Monthly Rental Income ÷ Monthly PITIA = DSCR

This is the standard formula lenders use across the states where DSCR loans are available. No variations, no exceptions — the formula is universal.

PITIA = Principal + Interest + Taxes + Insurance + Assessments (HOA)

The most common mistake investors make is forgetting to include taxes, insurance, or HOA dues. If you model only P&I, you'll overestimate your DSCR and be surprised at underwriting.

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DSCR Calculation Example 1: Single-Family (Ohio — Strong DSCR)

Let's start with a high-cash-flow example from Columbus, Ohio — one of OGJW's top-ranked DSCR markets for 2026.

• Purchase Price: $245,000 (Columbus OH, 3BR/2BA)
• Down Payment (25%): $61,250
• Loan Amount: $183,750
• Interest Rate: 7.5% (30-year fixed)
• Monthly P&I: $1,285
• Monthly Property Taxes: $320
• Monthly Insurance: $110
• HOA Dues: $0
• Total PITIA: $1,715
• Appraised Market Rent (1007 Schedule): $1,950/month

DSCR = $1,950 ÷ $1,715 = 1.14 ✅

This property qualifies for most DSCR programs. Ohio's low acquisition prices and strong rents make this type of result common in Columbus, Cleveland, and Cincinnati markets.

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DSCR Calculation Example 2: Texas SFR (Near the Threshold)

Now let's model a Texas property where taxes are a significant PITIA factor.

• Purchase Price: $265,000 (San Antonio TX, 3BR/2BA)
• Down Payment (25%): $66,250
• Loan Amount: $198,750
• Interest Rate: 7.5%
• Monthly P&I: $1,390
• Monthly Property Taxes: $442 (2% effective rate)
• Monthly Insurance: $155
• Total PITIA: $1,987
• Market Rent: $2,100/month

DSCR = $2,100 ÷ $1,987 = 1.06 ✅ (barely qualifies)

Texas's high property taxes (1.5–2.5%) significantly impact DSCR. Notice how the same loan amount produces a much lower DSCR than Ohio due to $442/month in taxes vs. $320/month.

To improve this Texas DSCR to 1.25+:

• Increase down payment to 30% → PITIA drops to ~$1,800 → DSCR = 1.17
• Find a property renting at $2,400/month → DSCR = 1.21
• Target markets with lower property taxes (SA near Loop 410 vs. premium suburbs)

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DSCR Calculation Example 3: Short-Term Rental (Arizona — STR DSCR)

Short-term rental DSCR loans use AirDNA projected income instead of a 1007 Rent Schedule. This is where DSCR qualification opens up dramatically in resort and tourist markets.

• Purchase Price: $420,000 (Scottsdale AZ, 3BR/2BA)
• Down Payment (25%): $105,000
• Loan Amount: $315,000
• Interest Rate: 7.75% (STR programs priced slightly higher)
• Monthly P&I: $2,254
• Monthly Taxes: $380
• Monthly Insurance: $150
• Total PITIA: $2,784

Long-Term Rent DSCR: $2,700 market rent ÷ $2,784 = 0.97 — Does NOT qualify

STR DSCR (AirDNA at 70% occupancy): $4,800 AirDNA avg × 70% = $3,360 qualifying income ÷ $2,784 = 1.21 ✅

The same property fails on long-term rent but qualifies on STR income. This is why OGJW recommends confirming lender STR DSCR acceptance before analyzing any Scottsdale, Flagstaff, or resort market acquisition.

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DSCR Ratio Benchmarks (OGJW 2026 Analysis)

DSCR Ratio	Interpretation	Lender Reception
Below 1.0	Negative cash flow	Disqualifies most programs
1.0 – 1.09	Break-even	Narrow program availability, higher rates
1.10 – 1.24	Marginal positive	Most programs; competitive rates begin
1.25 – 1.49	Strong	All standard programs at competitive rates
1.50+	Excellent	Best rates, IO options, aggressive LTV

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What Lenders Actually Use for Rental Income

Common investor error: Using Zillow estimates or your current lease in DSCR calculations.

What lenders actually use: The appraiser's Form 1007 Rent Schedule — a professional opinion of market rent based on comparable rentals. If your current tenant pays below market, the lender uses the higher market rent. If you're projecting above market rent, the lender will use the appraised market rent — which may be lower.

Always get a market rent estimate from a local property manager or rental comps before making an offer. If the 1007 Schedule comes in lower than projected, your DSCR calculation changes.

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5 Ways to Improve a Low DSCR Before Applying

1. Increase the Down Payment Every extra dollar down reduces loan amount and P&I. On a $300,000 loan at 7.5%, going from 20% to 25% down ($15,000 more) reduces monthly P&I by ~$105, improving DSCR by 0.06 points.

2. Reduce the Offer Price Paying $245,000 vs. $260,000 for a similar property saves ~$100/month in P&I. In competitive markets, this is often the most impactful lever.

3. Target Lower-Tax States Ohio (avg 1.1% effective rate), Indiana (0.87%), and Alabama (0.42%) produce dramatically better DSCR than Texas (2%) or New Jersey (2.5%) on identically-priced properties.

4. Interest-Only DSCR Option Switching to an IO structure reduces monthly payment by 8–12%. On a $300,000 loan at 7.5%, IO saves ~$248/month — often the difference between qualifying and not qualifying.

5. Short-Term Rental Income Qualification If long-term DSCR is below 1.0, check AirDNA projections. In tourist and resort markets, STR income can be 2–3x long-term market rent.

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Use Our Free DSCR Calculator

Model any property in 60 seconds — enter your purchase price, loan terms, taxes, insurance, and rent to instantly see your DSCR ratio and whether you qualify.

→ Free DSCR Calculator — includes DSCR, cap rate, cash-on-cash, and mortgage payment calculators

→ DSCR Loan Requirements by State — see the requirements table for all 36 states

→ Get Pre-Qualified — no income docs required, qualify on rental income