Cash Flow vs Cap Rate: Two Different Results

The Biggest Mistake New Investors Make

You're evaluating a multifamily property. Broker says it has a "great 8.5% cap rate." You're excited. You run numbers. Then you actually buy it and realize monthly cash flow is negative. You're confused—you thought the cap rate meant it was a good deal.

This happens constantly because cap rate and cash flow are completely different metrics, but new investors treat them as interchangeable. Confusing them costs real money.

Quick Definitions

Cash Flow: Money left in your pocket each month after ALL expenses (taxes, insurance, maintenance, mortgage). This is your personal paycheck.

Cap Rate: Property's earning power relative to purchase price, WITHOUT considering financing. This is deal quality independent of how you finance it.

Cash Flow Formula & Example

Formula: Gross Income – Operating Expenses – Mortgage = Cash Flow

Example:

• Monthly rental income: $4,000
• Operating expenses: $1,200 (taxes, insurance, maintenance, management)
• Mortgage payment: $2,000
• Monthly cash flow: $800

If positive, you get paid each month. If negative, you fund the property out of pocket. It's that simple.

Cap Rate Formula & Example

Formula: Net Operating Income ÷ Purchase Price = Cap Rate

Example:

• Annual rental income: $48,000
• Operating expenses: $14,400
• Net Operating Income (NOI): $33,600
• Purchase price: $400,000
• Cap rate: 8.4%

Cap rate ignores the mortgage—it shows what the property generates independent of financing.

Why They're Different (Critical for Deal Evaluation)

Cap rate IGNORES financing. It's always 8.4% for the property above, regardless of how you finance it.

Cash flow DEPENDS on financing. The mortgage payment directly affects what you keep.

Same Property, Different Financing = Different Cash Flow

Property: $400,000 with $33,600 annual NOI = 8.4% cap rate

Scenario A: 20% Down ($80K)

• Annual mortgage payment: $18,955
• Annual cash flow: $33,600 - $18,955 = $14,645
• Cash-on-cash return: 18.3%

Scenario B: 10% Down ($40K)

• Annual mortgage payment: $26,536
• Annual cash flow: $33,600 - $26,536 = $7,064
• Cash-on-cash return: 17.7%

The key: Same cap rate (8.4%), completely different monthly cash flow ($1,220 vs $589). This is why you need BOTH metrics.

The Screening Framework: Cap Rate First, Then Cash Flow

Step 1: Screen deals with cap rate

• Look for 8%+ cap rates (Capital Region standard)
• Eliminate sub-6% properties quickly
• Fast pre-screen of hundreds of deals

Step 2: Analyze promising deals with cash flow

• Model actual monthly income after your financing
• Test different down payment scenarios
• Verify YOU actually make money

Step 3: Decide

• High cap rate + positive cash flow = Buy
• High cap rate + negative cash flow = Pass (appreciation play, riskier)
• Low cap rate = Pass (unless specific strategy)

Real Deal Examples

Example 1: Strong Buy

• Cap rate: 8.2%
• Purchase price: $400,000
• Monthly cash flow: $1,100
• Decision: Buy

Example 2: Pass (Red Flag)

• Cap rate: 3.5%
• Purchase price: $1.2M
• Monthly cash flow: -$400
• Decision: Pass (you pay to own it)

The Bottom Line

Cap rate = deal quality (independent of financing) Cash flow = your personal paycheck (depends on how you finance)

Both metrics matter. New investors chase "good cap rates" and ignore negative cash flow, then end up funding properties from savings. Experienced investors use cap rate to filter 80% of deals quickly, then analyze cash flow to find winners.

Use both. Together they tell you everything.

Related Questions Investors Ask

• What's a good cap rate in the Capital Region?
• How do I calculate cash flow for a rental property?
• What's the difference between cap rate and cash-on-cash return?
• How much down payment do I need for positive cash flow?
• Should I prioritize cap rate or cash flow when evaluating deals?