How do I run the numbers before I buy an investment property?

Running the numbers on an investment property starts with the actual purchase price, the financing terms available to the buyer, realistic rental income for that specific property, and ongoing expenses like taxes, insurance and maintenance. Joel Boss pulls comparable sales and rental listings for the property type and town under consideration so those inputs come from real market data rather than assumptions. Only after those numbers are in place does it make sense to evaluate whether a specific deal works for a given buyer's goals.