Three metrics that all claim to measure how good a rental property investment is. They measure different things, and using the wrong one leads to bad decisions.

Published: 2026-09-16By: Toolhub Admin · About the author

You're looking at a rental property listed at $250,000. The listing says "8% yield." Your spreadsheet says 5.2% cap rate. Your mortgage broker says you'll get 12% cash-on-cash. All three numbers are about the same property. None of them are wrong. They're measuring completely different things — and confusing them is how investors buy properties that look profitable on one metric and bleed cash on another.

Rental yield: the simplest number

Gross rental yield is annual rent divided by property value. That's it.

Gross yield = Annual rent / Property value

$24,000 rent / $250,000 value = 9.6%

It's the metric that real estate listings love because it's always the biggest number. It ignores expenses, financing, vacancies, maintenance, insurance, taxes — everything except rent and price. It tells you one thing: what percentage of the purchase price comes back as gross rent each year.

Net rental yield subtracts operating expenses from the rent before dividing:

Net yield = (Annual rent - Operating expenses) / Property value

($24,000 - $8,000) / $250,000 = 6.4%

Net yield is more honest than gross yield, but it still doesn't account for how you financed the purchase. Whether you paid cash or borrowed 80% — the yield is the same. That makes it useful for comparing properties at a glance, but useless for understanding your actual return. Calculate it quickly with a rental yield calculator to screen properties before digging deeper.

Cap rate: the financing-agnostic view

Capitalization rate is Net Operating Income (NOI) divided by property value.

Cap rate = NOI / Property value

NOI is gross income minus all operating expenses: property taxes, insurance, management fees, maintenance, vacancy allowance. It does NOT include mortgage payments, because that's the whole point — cap rate deliberately strips out financing to show the property's intrinsic return.

Gross rent:         $24,000
Vacancy (5%):       -$1,200
Property tax:       -$3,000
Insurance:          -$1,200
Maintenance:        -$2,000
Management (8%):    -$1,920
NOI:                $14,680

Cap rate = $14,680 / $250,000 = 5.87%

Cap rate answers the question: "If I bought this property for cash, what annual return would the operations generate?" It's the standard metric for comparing properties regardless of how they're financed. A 6% cap rate property in one city is directly comparable to a 6% cap rate property in another — the financing terms are irrelevant.

Use a cap rate calculator to run the numbers. Or start from the other direction with a NOI calculator to verify that the operating expenses are realistic before plugging them in.

Cap rate is also used for valuation. If similar properties in the area trade at 5.5% cap rates, a property with $14,680 NOI is worth approximately $14,680 / 0.055 = $266,909. If the seller wants $300,000, the cap rate drops to 4.9% — below market, meaning you're overpaying relative to income.

Cash-on-cash: what you actually make

Cash-on-cash return is annual pre-tax cash flow divided by the total cash you invested.

Cash-on-cash = Annual cash flow / Total cash invested

This is the metric that includes financing. It answers: "Of the actual cash I put in, what percentage comes back to me each year?"

Purchase price:      $250,000
Down payment (20%):  $50,000
Closing costs:       $7,500
Total cash invested: $57,500

NOI:                 $14,680
Mortgage payments:   -$12,876  (30yr @ 6.5% on $200,000)
Annual cash flow:    $1,804

Cash-on-cash = $1,804 / $57,500 = 3.14%

That 9.6% gross yield property? It's actually returning 3.14% on your cash after expenses and debt service. The leverage amplified your purchasing power but the mortgage payment consumed most of the operating income.

How the same property tells three different stories

Same property, three metrics:

Gross yield:     9.6%   (looks great on a listing)
Cap rate:        5.87%  (decent, market-rate)
Cash-on-cash:    3.14%  (mediocre after financing)

The numbers diverge because each one includes or excludes different costs. Gross yield ignores everything. Cap rate includes operations but excludes financing. Cash-on-cash includes everything except tax effects and appreciation.

Now change the financing. Same property, but you put 40% down instead of 20%:

Down payment:     $100,000
Closing costs:    $7,500
Total invested:   $107,500

Mortgage:         $150,000 @ 6.5% = $9,657/yr
Cash flow:        $14,680 - $9,657 = $5,023

Cash-on-cash = $5,023 / $107,500 = 4.67%

Cash-on-cash went up (4.67% vs 3.14%) because the lower mortgage leaves more cash flow. But gross yield and cap rate didn't change at all — they don't see the financing. And notice: you invested $50,000 more cash to get an extra $3,219 in annual cash flow. That extra $50,000 would need to return more than 6.4% elsewhere to make the higher down payment a bad choice.

Now flip it: same property, interest rate drops to 4.5%:

Mortgage:         $200,000 @ 4.5% = $10,128/yr
Cash flow:        $14,680 - $10,128 = $4,552

Cash-on-cash = $4,552 / $57,500 = 7.92%

Cash-on-cash more than doubled, from 3.14% to 7.92%, purely from a lower interest rate. The property didn't change. The operating income didn't change. Cap rate is still 5.87%. But your actual cash return transformed because of financing terms. This is why cash-on-cash is essential for evaluating deals — and why cap rate alone can be misleading when interest rates shift.

When to use which metric

Screening properties: Gross yield. Fast, requires only rent and price, good for filtering a list of 50 properties down to 10 worth analysing. But never buy based on gross yield alone — it hides too much.

Comparing properties to each other: Cap rate. It normalizes out financing differences, so you're comparing the properties' operating performance directly. When a real estate investor says "I only buy above a 6 cap," they're using cap rate as a quality threshold independent of how they'll finance the purchase.

Evaluating a specific deal: Cash-on-cash. Once you have specific financing terms (rate, down payment, term), cash-on-cash tells you what your actual invested cash will earn. This is the metric that determines whether this particular deal, with this particular loan, is worth doing with your money.

Comparing to other investments: Cash-on-cash, but carefully. A 7% cash-on-cash rental return isn't directly comparable to a 7% stock market return, because the rental return doesn't include appreciation, tax benefits (depreciation), or the equity buildup from mortgage paydown. The stock return doesn't include the leverage benefit or the management headaches. They're different asset classes with different return profiles — the numbers are a starting point for comparison, not the whole story.

The mistake is using one number when you need all three. Yield screens. Cap rate compares. Cash-on-cash decides. Skip any one of them and you're flying partial instruments on a deal where the margins are thin and the commitment is long.

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