One word of advice, and something I intend to do once I have the money saved up, is to build or buy out property that can support apartments or townhomes. One tough mistake some people make is buying a pair of homes to rent out and they get a nice $2,000-$3,000 a month but that’s it. Buying a house is expensive and the rental prices keep lower income families from potentially coming to you with their money to rent. If you have an acre to work with (more or less is OK too) you should be talking to a contractor to build apartments or townhomes. You will make a little less per unit BUT your audience grows significantly because now you can have college students, single parents, older folks, etc. all able to afford your rental units AND instead of capturing one $1,000-$1,500 a month payments, you can probably charge $700 a month per unit (or more, depending on the market) and build maybe 3, 4, 5, 10 units for the price of a home or two and now you’re making something like $2,100-$10,000 a month. It all depends on what you have to invest but if you’ve got $250,000+ I’d highly suggest you talk to a bank/investor that can get you in touch with a good contractor to build on a property and get permits and take out a matching $250,000 loan (I’ve read that $500,000 is plenty to build a good amount of apartments to start) and you can fill up your apartments and make a killing every month. You’ll have more tenants to deal with but if you’re competitive with your pricing you won’t have a hard time keeping tenants or replacing them.
Owning property can earn you passive income for decades to come. Once you purchase a duplex, home, or apartment building as a rental property, you’ll earn a consistent monthly income with little work. Rent should cover your mortgage, taxes, repairs, and other expenses. You’ll continue to earn income by paying off your mortgage with the rent money and saving excess rental income.

Thanks for writing this Mr. Samurai. I just got over the student loan hump but I feel pretty good about it at 27 having a graduate degree and being 100% debt free. Now that I’m on the other side it is good for my brain to absorb some of your knowledge regarding passive income investments. I love gleaning wisdom from older folks who have been there and done that. Mentors rock!
Residual income is calculated as net income less a charge for the cost of capital. The charge is known as the equity charge and is calculated as the value of equity capital multiplied by the cost of equity or the required rate of return on equity. Given the opportunity cost of equity, a company can have positive net income but negative residual income.