The thing is, I’m not talking about buying brick-and-mortar buildings. I tried that many years ago with my father-in-law, and with devastating results. We tried to buy a duplex once, and the deal fell apart after we realized we weren’t really prepared for the purchase. I secretly wanted to become a landlord, but at the same time, I knew it wasn’t for me.

For a person working for a wage, their source of income is their job, or their labor (aka their time that they sell to someone). But you can own a house, and rent it out, and when your renters pay you renter every month, the source of that income check is your rental property, or your house. It would just be called rental income. If you have money in the bank in an account that pays interest, those interest payments are another source of income. We can say the source is interest payments, or we can identify the asset that is generating rent, and say your money in the bank that is generating “rent” (aka interest) is your source of income.