Rental yield is usually a simple ratio: annual rent divided by property price or value, expressed as a percentage. Cash flow is what hits your checking account after mortgage principal and interest, taxes, insurance, maintenance, vacancies, and management. A “high yield” asset can still drip negative monthly cash if leverage and expenses are hungry enough.
Worked example: same rent, different cash
Suppose a duplex trades for $420,000 and rents for $3,400 per month total. Gross annual rent ≈ $40,800. Gross yield ≈ 40,800 / 420,000 ≈ 9.7% before expenses - headline attractive in many markets.
Layer financing: 20% down ($84,000) plus closing, and a loan at 6.75% fixed for 30 years on $336,000. Principal+interest might land near $2,180/month depending on exact fees and escrow treatment. Add $420 taxes/insurance reserves, $300 maintenance/vacancy reserve, $200 management - monthly outflows could approach $3,100. Pre-tax cash flow is only about $300/month even though gross yield looked generous.
When yield is the right scoreboard
Yield shines when comparing unlevered opportunities or benchmarking cap-rate-like thinking across geographies. It fails when debt terms, tax treatment, or capex cycles dominate outcomes - then cash flow is the adult supervision metric.
| Metric | Strength | Blind spot |
|---|---|---|
| Gross rental yield | Fast comparables across listings | Ignores financing, repairs, vacancy, tax |
| Monthly cash flow | Liquidity and survivability | Can miss long-term appreciation or principal paydown benefits |
Toollabz calculators
Start with the rental yield calculator for headline ratios, then layer property ROI and rent vs buy when deciding whether to allocate cash to equity or keep optionality.
Real-estate cluster reading
Connect yield vs cash thinking to rent vs buy USA, comparing rent vs buy without hype, and loan literacy in how amortization works. For portfolio-level profit language, revisit gross vs net profit.
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