How to Analyze a Rental Property in 10 Minutes (Worked Example)

Most rental property analysis fails in one of two ways. Either it stops at the listing's numbers (price, rent, "cap rate 6%") and never asks what the investor actually earns, or it becomes a 40-tab spreadsheet nobody trusts. This is the 10-minute version that gets the answer right: what does this property pay me, at this price, on assumptions I can defend.

You need five inputs and one decision. The worked example below carries one property through every step so you can check every number.

Step 1: Pin down the rent (2 minutes)#

Rent is the input that breaks the most analyses, because a listing agent's "rents for $2,800" is a hope, not a comp. Get at least two independent estimates and treat the spread as information.

• Pull the rental estimate from two or more sources. DealGapIQ blends RentCast, Zillow, and Redfin rental estimates into a single IQ Estimate and shows the spread.
• Check three active or recently leased comparables within a mile with the same bed/bath count.
• If the sources disagree by more than 10%, underwrite on the lower figure and note the upside.

Step 2: Build the operating expenses (3 minutes)#

Operating expenses are everything it costs to own and run the property except the mortgage. Use percentages of rent for the variable items and real quotes for the fixed ones.

Two things worth saying about this table.

The percentage items are placeholders until you have better data. A 1960s house needs more than 5% for maintenance. A 2018 build in a landlord-friendly market can justify less. DealGapIQ ships with editable defaults for every line; the national benchmarks page shows typical ranges.

Management at 0% is a real choice, not a free one. If you self-manage, your time is the cost. If you later hire a manager at 8%, this property loses $208 a month of cash flow. Run it both ways.

Step 3: Net operating income#

NOI is rent minus operating expenses. It is the number the property produces before anyone asks how it was financed.

$2,600 − $986 = $1,614/month = $19,370/year

Cap rate is NOI divided by price: $19,370 ÷ $325,000 = 5.96%. That is a respectable-looking number for a single-family rental, and it tells you almost nothing about what you will earn, because it ignores the mortgage. More on that in cap rate vs cash-on-cash.

Step 4: Debt service (2 minutes)#

Now finance it. The example uses conventional investor terms.

• Down payment: 20% = $65,000
• Loan: $260,000 at 6.0%, 30-year fixed
• Monthly principal and interest: $1,559
• Annual debt service: $18,706
• Closing costs: 3% of price = $9,750

Total cash invested: $65,000 + $9,750 = $74,750.

Step 5: Cash flow and cash-on-cash return#

Cash flow = NOI − debt service = $19,370 − $18,706 = $664/year (~$55/month)

Cash-on-cash = $664 ÷ $74,750 = 0.9%

This is the moment most listing-sheet analyses never reach. A 5.96% cap rate became a 0.9% return on the investor's actual money, because at a 6% mortgage rate the loan consumes almost all of the NOI. The property is not a loser. It is a savings account that comes with tenants.

The debt service coverage ratio is $19,370 ÷ $18,706 = 1.04. Most DSCR lenders want 1.20 to 1.25, so this property would not qualify for a DSCR loan at this price either. See how to calculate DSCR for why that matters even when you are using conventional financing.

Step 6: The decision — what price makes it work?#

Here is where a 10-minute analysis earns its time. Do not stop at "0.9%, pass." Solve for the price that meets your target.

Set a return target. Say 8% cash-on-cash. Taxes, insurance, and the loan all scale with price, so you solve for the price where NOI minus debt service equals 8% of cash invested. At this rent and these assumptions:

• Income Value (break-even price, cash flow = $0): $333,347
• Target Buy (8% cash-on-cash): $270,731
• Deal Gap: ($325,000 − $270,731) ÷ $325,000 = 16.7%

Check the Target Buy. At $270,731: loan $216,585, payment $1,299, NOI $20,564 (lower taxes and insurance at the lower price), debt service $15,582, cash flow $4,981 on $62,268 invested. That is 8.0%, with a DSCR of 1.32.

So the analysis does not end with a verdict on the listing. It ends with your number: $270,731 at these terms, or $325,000 at different terms. That is a Deal Gap of $54,269 to close, and there are more ways to close it than a price cut. That is the subject of the offer pillar.

The mistakes that make a 10-minute analysis wrong#

Using gross rent. Rent is not income. $2,600 of rent is $1,614 of NOI here.

Skipping vacancy and reserves because "the area is strong." Strong areas still have turnover. A 5% vacancy allowance is about 18 days a year. Most investors would take that.

Trusting the listing's tax figure. Property taxes often reset on sale to the new purchase price. The seller's $2,100 bill can become your $3,900 bill.

Ignoring insurance trends. Insurance in coastal and hail-prone states has risen far faster than rent. Get a real quote before you write the offer.

Anchoring on cap rate. Cap rate is a property metric. Cash-on-cash is an investor metric. You are the investor.

Counting appreciation to make cash flow work. If the deal needs 5% a year in price growth to be a deal, it is a market bet. Underwrite on cash flow, take appreciation as upside.

Stress test it in one minute#

Change one input at a time and watch cash flow.

Every row is a conversation. The rent row is a comp check. The management row is a lifestyle decision. The rate row is a lender call or a seller-carried second. The price row is a negotiation. A good analysis does not just produce a number; it tells you which lever is worth pulling.

What to do next#

If the property clears your target at asking, verify the inputs and write the offer. If it does not, you now know the Target Buy, the gap, and which lever moves it most. Run the same property as a house hack or BRRRR and the Target Buy changes, sometimes enough to close the gap on its own. The long-term rental strategy guide covers where this strategy fits and where it does not.

We analyze. You decide. Not financial, legal, or investment advice. Figures are illustrative and use editable DealGapIQ assumptions; verify taxes, insurance, and rent for any real property.