Cap Rate vs. IRR vs. Cash-on-Cash: Which Return Metric Should You Use?

Three numbers tell you almost everything about a multifamily deal before you go deeper. Cap rate, IRR, and cash-on-cash return each answer a different question, apply at a different stage of analysis, and fail in different ways when misused. This guide explains what each metric measures and when to reach for it.

What Is a Cap Rate?

The Capitalization Rate, or Cap Rate, shows how much income a property generates relative to its price. It gives you a quick way to compare different properties or assess income potential before going deeper into the numbers. Think of it as a speedometer for your investment: a fast read on how the property performs at its current value.

The formula has two inputs: Net Operating Income (NOI) and property value.

• Net Operating Income (NOI): Income remaining after paying all regular operating expenses, including property taxes, maintenance, insurance, and management fees. It does not include mortgage payments.
• Property Value: Either the purchase price or the current market value of the property.

Cap Rate = (NOI / Property Value) × 100

Example: You buy a small apartment building for $500,000. After expenses (excluding mortgage), it generates $40,000 per year.

$40,000 / $500,000 × 100 = 8% Cap Rate

The property generates an 8% return on its value per year before debt and taxes. A higher cap rate generally signals better income return, but it also reflects higher risk. Use cap rate as a first-look metric. It does not account for financing or changes over time.

What Is IRR?

While cap rate looks at a single snapshot, Internal Rate of Return (IRR) covers the entire investment period, including the purchase, rental income, and eventual sale. It answers one question: what is your average annual return, accounting for every cash flow over time?

IRR is the rate at which the net present value of all cash inflows and outflows equals zero. It accounts for both the amount and the timing of money. A dollar received today is worth more than a dollar received five years from now, and IRR builds that reality into the calculation.

Example:

• Buy a property for $100,000
• Receive $10,000 in net rental income each year for 5 years
• Sell for $150,000 at the end of year 5

IRR calculates the annualized return across all those cash flows combined. Doing this by hand is complex. Underwriting tools handle it automatically.

IRR is your long-range return forecast. It tells you the expected annual return across the full life of the investment, from acquisition through exit.

What Is Cash-on-Cash Return?

Cash-on-cash return measures the actual cash you receive versus the cash you invested. It ignores non-cash items like depreciation and focuses entirely on real income performance. This is the "show me the money" metric.

Cash-on-Cash Return = (Annual Net Cash Flow / Total Cash Invested) × 100

• Annual Net Cash Flow: Money remaining after mortgage payments and all expenses.
• Total Cash Invested: Down payment, closing costs, and any other upfront cash.

Example: You put $50,000 cash into a property and receive $7,000 in net cash flow per year after covering the mortgage and expenses.

$7,000 / $50,000 × 100 = 14% Cash-on-Cash Return

You are making a 14% cash return on your personal investment in one year. This metric is essential for investors focused on current income rather than long-term appreciation.

When to Use Each Metric

• Cap Rate: Use for a quick comparison between properties. Best for initial screening. Does not account for financing or hold period.
• IRR: Use when evaluating the full investment cycle, including purchase, operations, and exit. Accounts for timing of cash flows. Best for comparing deals with different hold periods or exit assumptions.
• Cash-on-Cash Return: Use when evaluating year-one income performance relative to your actual cash investment. Best for income-focused investors who want to know what the property puts in their pocket annually.

These three metrics work best together. Cap rate gives you a quick screen. Cash-on-cash tells you what you earn on your money this year. IRR tells you your total return over the life of the deal.

The Bottom Line

Cap rate, IRR, and cash-on-cash are the three most practical metrics for evaluating real estate deals. Start with cap rate to screen properties quickly. Use cash-on-cash to understand current income on your invested dollars. Use IRR to compare the full-cycle return across different opportunities.

If calculating these by hand takes too long, MultiVest Engine runs all three automatically from your deal inputs and produces a full analysis in under three minutes.