Cash Flow Analysis for Buy-and-Hold Investors

Accurate cash flow projection separates profitable rentals from money-losing ones.

Cash flow analysis for rental properties requires accounting for every expense category, not just the mortgage payment. The gap between projected and actual cash flow is where most new landlords get burned.

Income projection: Use comparable rental rates from the same neighborhood and property type. Don't use the highest comp — use the average or slightly below to be conservative. Factor in a 5-8% vacancy rate.

Expense categories: Mortgage payment (principal + interest), property taxes, insurance, property management (8-10% of gross rent even if self-managing — value your time), maintenance reserve (8-10% of gross rent), capital expenditure reserve (5-8% for roof, HVAC, appliances), HOA fees if applicable, and utilities if owner-paid.

The 50% rule: A quick screening metric that estimates operating expenses (excluding mortgage) at 50% of gross rent. If rent is $2,000/month, assume $1,000 in expenses. Subtract the mortgage from the remaining $1,000 to estimate cash flow.

Cash-on-cash return: Annual cash flow divided by total cash invested. A 8-12% cash-on-cash return is considered strong for residential rentals.

Stress testing: Model scenarios where rent decreases 10%, vacancy doubles, or a major repair hits. If the property still breaks even under stress, it's a resilient investment.