Most investors who lose money on rental properties made the same mistake: they fell in love with a property before running the numbers. These three metrics — cap rate, cash-on-cash return, and gross rent multiplier — let you evaluate any property in under 10 minutes.
Step 1: The 1% Rule Screen (30 Seconds)
Before doing any deeper analysis, apply the 1% rule: monthly rent ÷ purchase price ≥ 1%.
| Purchase Price | Minimum Monthly Rent to Pass 1% Rule |
|---|---|
| $100,000 | $1,000 |
| $150,000 | $1,500 |
| $200,000 | $2,000 |
| $300,000 | $3,000 |
| $400,000 | $4,000 |
If a property fails this screen in your market, move on — or understand you’re buying for appreciation, not cash flow. In high-cost markets, you will rarely find a property meeting the 1% rule; in those markets, adjust your expectations toward appreciation and equity building.
Step 2: Calculate Net Operating Income (NOI)
NOI is the foundation of every other metric. It is gross rental income minus all operating expenses — but not including mortgage payments.
NOI Formula
NOI = Gross Rent − Vacancy − Operating Expenses
Worked Example: 3-Bedroom House, Purchase Price $230,000
| Income/Expense | Annual | Monthly |
|---|---|---|
| Gross rent (market rate) | $24,000 | $2,000 |
| Vacancy allowance (5%) | −$1,200 | −$100 |
| Effective Gross Income | $22,800 | $1,900 |
| Property taxes | −$3,200 | −$267 |
| Homeowners insurance | −$1,400 | −$117 |
| Maintenance/repairs (10% of rent) | −$2,400 | −$200 |
| Property management (8% of rent) | −$1,920 | −$160 |
| CapEx reserve (roof, HVAC, appliances) | −$1,800 | −$150 |
| Total Operating Expenses | −$10,720 | −$894 |
| Net Operating Income (NOI) | $12,080 | $1,006 |
Note: No mortgage payment is included in NOI. That’s intentional.
Step 3: Cap Rate
Cap Rate = NOI ÷ Purchase Price × 100
Using the example above: $12,080 ÷ $230,000 × 100 = 5.25% cap rate
Cap Rate Benchmarks by Market Type
| Market Type | Typical Cap Rate Range | Example Markets |
|---|---|---|
| High-cost coastal | 3–5% | NYC, LA, San Francisco, Seattle |
| Major metros (mid-cost) | 5–7% | Denver, Austin, Nashville, Phoenix |
| Secondary cities | 6–9% | Columbus, Indianapolis, Memphis |
| Small cities / rural | 8–12%+ | Smaller Midwest/South markets |
A 5.25% cap rate is decent for a mid-cost market. It means if you paid all cash, you’d earn 5.25% annually before taxes — comparable to a bond.
Cap rate does not account for financing. That’s why you also need cash-on-cash return.
Step 4: Cash-on-Cash Return
Cash-on-cash (CoC) measures actual cash flow relative to cash invested. This is the number that tells you whether the investment works for you with your actual mortgage.
Cash-on-Cash = Annual Pre-Tax Cash Flow ÷ Cash Invested × 100
Continuing the Example (25% Down, 6.9% Mortgage Rate)
| Annual | Monthly | |
|---|---|---|
| NOI | $12,080 | $1,007 |
| Mortgage payment (6.9%, 30-yr, $172,500 loan) | −$9,780 | −$815 |
| Annual Pre-Tax Cash Flow | $2,300 | $192 |
| Cash Invested | Amount |
|---|---|
| Down payment (25%) | $57,500 |
| Closing costs (~2.5%) | $5,750 |
| Initial repairs / turnover | $3,000 |
| Total Cash Invested | $66,250 |
Cash-on-Cash Return = $2,300 ÷ $66,250 = 3.47%
A 3.47% cash-on-cash return is modest. You’re earning $192/month in cash flow on a $66,250 investment. Many investors set a minimum threshold of 5–8% CoC before buying.
How Financing Affects Cash-on-Cash
| Scenario | Monthly Cash Flow | Annual CoC |
|---|---|---|
| All cash, no mortgage | $1,007 | 5.25% (= cap rate) |
| 20% down, 6.9% rate | $113 | 1.74% |
| 25% down, 6.9% rate | $192 | 3.47% |
| 25% down, 5.5% rate | $360 | 6.52% |
Higher interest rates crush cash-on-cash returns. This is why many properties that penciled out at 3% rates no longer work at 6.9% — the math changed, not the property.
Step 5: Gross Rent Multiplier (GRM)
GRM is a faster, rougher metric. It’s the purchase price divided by annual gross rent.
GRM = Purchase Price ÷ Annual Gross Rent
Lower GRM = better value relative to gross income
$230,000 ÷ $24,000 = GRM of 9.6
| GRM Range | General Implication |
|---|---|
| Under 7 | Potentially strong cash flow market |
| 7–10 | Moderate cash flow potential |
| 10–15 | Likely appreciation-focused market |
| Over 15 | Very difficult to generate cash flow |
GRM is useful for quick comparisons between multiple properties in the same market. It ignores expenses, so it’s not a substitute for full NOI analysis.
The Full Deal Analysis Template
Before making an offer, complete this analysis:
| Metric | Your Property | Minimum Target |
|---|---|---|
| Monthly rent | $_____ | $_____ |
| 1% Rule (rent ÷ price) | ____% | ≥ 1.0% |
| NOI | $_____ | Positive |
| Cap Rate | ____% | ≥ 5% (market dependent) |
| Cash Invested | $_____ | — |
| Annual Cash Flow | $_____ | Positive |
| Cash-on-Cash Return | ____% | ≥ 5% |
| GRM | _____ | < 12 |
| Vacancy Rate (local market) | ____% | < 8% |
| 5-Year NPV at exit | $_____ | Positive |
What the Numbers Don’t Tell You
Even strong numbers can hide problems:
- Deferred maintenance: A fresh coat of paint hides an aging roof. Always get an inspection.
- Rent at market rate?: Verify against comparable rentals — sellers sometimes show pro-forma (optimistic) rent figures, not actual achievable rent.
- Neighborhood trajectory: A 9% cap rate in a declining market is worse than a 6% cap rate in an improving one.
- Management reality: Self-managing saves 8–10% but costs you time. Model both scenarios.
- Financing availability: Investment property loans require 15–25% down and carry higher rates than primary residence mortgages.
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