I make some income from Retire by 40. Right now, all of the income is from advertising. If you’re curious about my online income, you can sign up for our monthly newsletter and see the break down. I’m not exactly sure how I would categorize my online income, though. If I stop blogging, the income will continue, but I’m sure it would decrease over time. I guess blogging income is 50% active and 50% passive at this point.
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.