Home / The Complete Guide to Rental Property Investing
The Complete Guide to Rental Property Investing
Cash flow, PITI/escrow, property tax and key return metrics.
By Jessica Martinez · Real Estate Finance Editor · Updated June 2026Cash flow, PITI/escrow, property tax and key return metrics.
By Jessica Martinez · Real Estate Finance Editor · Updated June 2026Real estate can build wealth, but only if the numbers work. This guide covers how to evaluate a rental and the ongoing costs of ownership, with a calculator for each.
The first question on any rental is whether rent covers all costs with money left over. The Rental Property Calculator models income, expenses, financing and returns so you can see cash flow and ROI before you buy. A property that doesn't cash flow relies entirely on appreciation - a riskier bet.
A mortgage payment is more than principal and interest: it usually includes taxes and insurance (PITI), often collected in an escrow account. The Mortgage Escrow Calculator breaks down the full monthly obligation, and the Property Tax Calculator estimates the property-tax piece, which varies enormously by location and is easy to underestimate.
Leverage amplifies both returns and risk. The rate and term you finance at drive cash flow, and refinancing later can improve it if rates fall. The Refinance Calculator compares payments and shows the break-even on closing costs, so you can decide whether a refinance actually pays.
Beyond cash flow, investors watch cap rate (net operating income divided by price, for comparing properties), cash-on-cash return (annual cash flow over cash invested), and reserves for vacancies and repairs. A deal that looks good on gross rent can disappoint once realistic expenses and vacancy are included.
Underwrite conservatively: use realistic rents, budget 5 to 10 percent for vacancy and similar for maintenance, and stress-test against a higher interest rate. The best protection against a bad deal is honest numbers up front - confirm them with local data and professionals before committing.
Confirm it cash flows after all expenses and financing, then check cap rate and cash-on-cash return.
Principal, interest, taxes and insurance - the full monthly housing cost, often escrowed.
Net operating income divided by price, used to compare properties.
Often 5 to 10 percent of rent each - underwrite conservatively.
No - it's general information; verify with local data and professionals.