How to Analyze a Rental Property Deal
A milestone-driven guide to rental property analysis — follow Emily's Memphis triplex through NOI, cap rate, cash-on-cash return, DSCR, and the deal scorecard that separates good investments from bad ones.
- Six metrics separate good deals from bad ones: NOI, cap rate, cash-on-cash return, DSCR, cash flow, and the 1% rule — run all six, not just one
- The same property can lose $104/month at $295K or earn $161/month at $265K — purchase price and rate sensitivity are everything
- Cap rate measures the property's yield regardless of financing; cash-on-cash return measures YOUR return based on how you financed it
- A DSCR below 1.0 means the property can't cover its own debt — most lenders won't touch it, and neither should you without a clear value-add plan
- Never trust the seller's expense numbers. Budget vacancy at 5-8%, maintenance at 10%, and management at 8-10% — even if you plan to self-manage
- The best investors don't find the most deals — they kill the most deals and keep only the ones that pass every test
About This Guide
Emily found what looked like a deal. A triplex in a B-class Memphis neighborhood. All three units rented. The listing sheet painted a rosy picture. Then she ran the numbers properly — and the picture changed.
This guide walks through the six metrics that separate profitable rentals from money pits, step by step, on a single property. You'll see how the same deal breaks at one price and works at another. And you'll build a scorecard you can use on every property you evaluate.
Want to run these numbers on your own deals as you follow along? Use our investment calculator to plug in any property and compare scenarios side by side.
Learning Journey
Calculate Net Operating Income
Strip away the noise and find what the property actually earns — the number every other metric depends on
NOI — net operating income — is the foundation of deal analysis. Every metric downstream depends on getting this number right. Get it wrong by $2,000 and your cap rate, cash flow, DSCR, and cash-on-cash return are all garbage.
The formula is simple: NOI = Gross Rental Income − Operating Expenses. But the simplicity is deceptive. What counts as income? Rent, laundry fees, parking fees, application fees. What counts as operating expenses? Property taxes, insurance, property management (8-10% of gross rent), maintenance reserves (5-10%), vacancy allowance (5-8%), landlord-paid utilities, landscaping, pest control.
What does NOT go into NOI: mortgage payments, capital expenditures (new roof, HVAC), and depreciation. Those are handled separately. Mixing debt service into NOI is the #1 beginner mistake — it makes deals look worse than they are because you're double-counting the mortgage.
Emily found what looked like a deal. A triplex in Memphis, Tennessee. Listed at $295,000. All three units rented. Gross income of $2,900 a month — $1,050, $950, and $900 across the three units. She calculated the numbers on the back of a napkin. Looked great.
Then she ran them properly.
Gross potential rent: $34,800/year. But she deducted 7% vacancy ($2,436) — because tenants leave, and Memphis vacancy runs 6-8% in B-class neighborhoods. Effective gross income: $32,364.
Operating expenses hit harder than expected. Property taxes: $4,500/year. Insurance: $2,100. Property management at 8%: $2,589. Maintenance reserve at 10%: $3,240. Landlord-paid water/sewer: $1,440. Landscaping: $900. Total operating expenses: $14,769.
NOI = $32,364 − $14,769 = $17,595/year. That's $1,466/month.
Not the $2,900/month the listing flyer bragged about. Not even close. Emily's real income — after running the building — was just over half the gross number. That gap is where bad decisions live.
Stack the Metrics
Convert NOI into the five metrics that tell you whether to buy, negotiate, or walk — and see how they change when price and rates shift
One metric tells you one thing. Five metrics tell you the full story. Here's how they connect.
Cap rate converts NOI into a yield: Cap Rate = NOI / Purchase Price × 100. It assumes all-cash — no financing. That's intentional. It isolates the property's income from how you fund it. Below 4% is coastal-market territory (appreciation play). 5-8% is the sweet spot for income investors. Above 8%, check the neighborhood.
Cash flow is what lands in your pocket after everything: Cash Flow = NOI − Debt Service. This is the real number — the one you live on.
Cash-on-cash return measures YOUR return: Annual Cash Flow / Total Cash Invested × 100. Unlike cap rate, this accounts for leverage. Same property, different financing, different CoC return.
DSCR tells lenders (and you) whether the income covers the debt: DSCR = NOI / Annual Debt Service. Below 1.0 means the property bleeds money. Above 1.25 means comfortable coverage.
The 1% rule is a fast screen: monthly rent should be at least 1% of the purchase price. Below 0.8%? Move on. Above 1.0%? Worth analyzing. Once you know the formulas, plug your numbers into the investment calculator to compare scenarios side by side.
Emily ran every metric on her Memphis triplex at the asking price — $295,000 with a 7.0% rate, 20% down ($59,000), loan amount $236,000.
Cap rate: $17,595 / $295,000 = 5.96%. Acceptable for Memphis B-class. Not exciting.
Monthly cash flow: $1,466 (NOI) − $1,570 (P&I) = −$104/month. Negative cash flow. The property costs her money every month.
Cash-on-cash return: −$1,245/year ÷ $70,000 total cash in (down payment + closing + repairs) = −1.8%. Her money is losing value.
DSCR: $17,595 / $18,840 = 0.93. Below 1.0. A DSCR lender wouldn't touch this.
1% Rule: $2,900 / $295,000 = 0.98%. Just under. Yellow flag.
Then she ran the same property at a negotiated price of $265,000 with a 6.25% rate. Everything shifted.
Cap rate jumped to 6.64%. Monthly cash flow flipped to +$161. Cash-on-cash went from −1.8% to +3.1%. DSCR improved to 1.12. The 1% rule cleared at 1.09%.
Same building. Same tenants. Same NOI. A $30,000 price reduction and 75 basis points on the rate turned a bad deal into a workable one. That's the power of running the numbers at multiple scenarios — you find the price where the math flips.
Build the Deal Scorecard
Organize every metric into a side-by-side comparison that makes the go/no-go decision obvious
A deal scorecard puts every metric on one page. You stop guessing and start comparing. The format: one row per metric, columns for your deal at different price points (or different properties), and a target range column that shows your criteria.
The scorecard reveals patterns that single metrics hide. A property might have a decent cap rate but terrible cash flow. Or strong DSCR but weak cash-on-cash. The scorecard shows all of this at once. If three or more metrics fall outside your target range, it's a pass.
The gross rent multiplier (GRM = Purchase Price / Annual Gross Rent) adds another quick filter. A GRM between 4-7 is solid. Above 8, the property is expensive relative to its income.
Break-even occupancy tells you how full the building needs to be just to cover all costs. Total annual expenses (operating + debt service) divided by gross potential rent. If break-even is above 90%, one vacancy sinks you. The investment calculator builds this scorecard automatically — enter your deal numbers and it shows you the full picture.
Emily put her Memphis triplex on a single-page scorecard at both price points.
At $295K / 7.0%: NOI $17,595. Cap rate 5.96%. Cash flow −$104/month. CoC return −1.8%. DSCR 0.93. 1% rule 0.98%. GRM 8.5. Break-even occupancy 96.6%.
At $265K / 6.25%: NOI $17,595 (same). Cap rate 6.64%. Cash flow +$161/month. CoC return 3.1%. DSCR 1.12. 1% rule 1.09%. GRM 7.6. Break-even occupancy 87.2%.
The scorecard made the decision visual. At asking price, five out of eight metrics were in the danger zone. At $265K, only two were marginal (DSCR still below 1.25, GRM slightly high). The break-even occupancy told the real story: at $295K, Emily needed 96.6% occupancy just to stay afloat — one empty unit for one month and she's underwater. At $265K, break-even dropped to 87.2% — she could absorb a vacancy without bleeding cash.
Emily offered $265,000. The seller countered at $278,000. She ran the scorecard at $278K. Cash flow: $34/month. DSCR: 1.02. Break-even: 92.1%. Three metrics still in yellow. She walked.
Two weeks later, she found a duplex in the same neighborhood. Listed at $195,000. Gross rent $2,200/month. She ran the scorecard: every metric cleared. She made an offer that day.
Verify the Numbers — Due Diligence
The metrics are only as good as the inputs — how to verify income, expenses, and property condition before you commit capital
Numbers on a spreadsheet don't mean anything until you verify them against reality. The seller has every reason to present the best possible picture. Your job in due diligence is to stress-test every input.
Verify income first. Request 12-24 months of actual rent rolls — not projected rents, not what the listing agent thinks units "could" rent for. Cross-check against current listings on Zillow, Apartments.com, and Craigslist in the same zip code. If the seller claims $1,050/unit and comps show $925, your NOI just dropped $4,500/year.
Verify expenses second. Get the actual property tax bill (not an estimate), insurance quotes from two carriers, 12 months of utility bills, and maintenance records. Then add your own reserves: 8-10% management (even if you self-manage — your time has value), 5-8% vacancy, 10% maintenance. Budget $200-$300/unit/year for capital expenditures (roof, HVAC, water heater).
Inspect the property. A $400-$600 inspection reveals deferred maintenance the seller won't mention — 20-year-old roof, corroding plumbing, outdated electrical panel. These don't show up in operating expenses until they fail.
Emily found the duplex that passed her scorecard. Before writing the earnest money check, she ran due diligence.
First, income verification. The seller claimed both units rented at $1,100/month. Emily asked for 12 months of rent rolls. The actual numbers: Unit A paid $1,100 consistently. Unit B paid $1,100 for 8 months, was vacant for 2 months during a turnover, and the new tenant started at $950 after a concession to fill the unit fast. Real average monthly income: $1,975, not $2,200.
That single discovery dropped her NOI by $2,700/year. Her cap rate fell from 7.8% to 6.4%. Cash-on-cash went from 8.2% to 5.1%. Still workable — but very different from the listing's version of reality.
Next, the inspection. The inspector flagged a 22-year-old roof (3-5 years of remaining life, $8,500 replacement), galvanized supply lines in the basement (functional but corroding — $3,200 to replace), and a 15-year-old HVAC in Unit B (running but inefficient). None of these killed the deal. But Emily budgeted $15,000 in near-term capital expenditures — money she'd need within 3 years.
She renegotiated. Original offer: $195,000. Adjusted offer: $182,000 — reflecting the income gap and deferred maintenance. The seller accepted at $186,000. At that price, Emily's scorecard showed a 7.1% cap rate, $187/month cash flow, 5.8% cash-on-cash, and a 1.23 DSCR. Every metric in the green zone.
The deal worked because Emily verified the numbers before committing. The seller's version of the deal and the real version were $9,000 apart — and that gap would have eaten her returns for the life of the investment.
The annual pre-tax cash flow from a rental property divided by the total cash you invested — the most direct measure of how hard your money is actually working.
Read definition →A ratio that measures whether a rental property's income covers its debt payments — calculated by dividing rental income by total debt service (PITIA), where 1.0 means breakeven and 1.25+ means strong cash flow.
Read definition →The ratio of a loan amount to a property's appraised value, expressed as a percentage — a 75% LTV on a $200,000 property means a $150,000 loan and $50,000 in equity.
Read definition →The estimated market value of a property after all planned renovations are complete, based on comparable sales of similar properties in similar condition.
Read definition →The percentage of time a rental property sits empty and produces no income, calculated as vacant units divided by total units — the silent profit killer in rental investing.
Read definition →The total expense of renovating an investment property, including materials, labor, permits, and contingency reserves — typically the second-largest cost in a BRRRR deal after the purchase price.
Read definition →A real estate investment strategy — Buy, Rehab, Rent, Refinance, Repeat — that lets investors recycle capital across multiple properties by forcing equity through renovation and extracting it through refinancing.
Read definition →An increase in property value created directly by the investor through renovations, operational improvements, or rent increases — as opposed to passive market appreciation that happens over time without intervention.
Read definition →A short-term, asset-based loan from a private lender, typically used to finance property acquisitions and renovations at higher interest rates than conventional mortgages, with the property itself as collateral.
Read definition →Seasoning Period is a real estate lending concept that describes a specific aspect of how real estate transactions, analysis, or operations work in the context of brrrr strategy deals.
Read definition →Further Reading
- 1How to Find Off-Market Rental Deals (Before Other Investors)7 min read·Nov 19, 2024
- 2What DSCR Lenders Look For: Minimum Ratios, How They Differ, and Who Qualifies6 min read·Oct 8, 2024
- 3Cap Rate vs Cash-on-Cash Return: Which Metric Actually Matters?7 min read·Aug 12, 2024
- 4Rental Property Spreadsheet Template: What to Track and How to Build One6 min read·Jul 25, 2024
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Martin Maxwell
Founder & Head of Research, REI PRIME
Specializing in rental properties, I excel in uncovering investments that promise high returns. Sailing the seas is my escape, steering through challenges just like in the world of real estate.
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