Real estate is the obvious choice if you are going to make money on your money. I personally am not at the point where I can do any of this in a meaningful way BUT my parents are and they now own a couple homes outright and are collecting income from them to power their retirement income. It makes a lot more sense for anyone that has a chunk of cash sitting in the bank and are planning on slowly drawing from it because you technically still have all that money in a property (or multiple properties) and can sell them if you really need the lump sum of cash but you’ll earn great interest payments until you do that.

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2. Real Estate: Real estate is #2 for one simple reason, leverage – using smart debt and other people’s money. When looking at real estate rents and the potential for income real estate provides, it is the trifecta of residual income. First, a home or rental property can appreciate, so capital appreciation is the first long-term benefit of owning a home. Second, rent. Other people are paying the mortgage, insurance, property taxes and maintenance while you own that piece of real estate. Third, tax protection. Rental income is taxed at a lower rate than ordinary income and you can depreciate real estate by taking a paper deduction on your annual tax return not to mention expensing the cost of mileage, mortgage interest, and updates to the property. Rentals done right can generate almost double what the stock market can in dividends and interest. The fourth and maybe most hidden, but important benefit is that over time rent’s rise, protecting your cash-flow against inflation, while your mortgage interest can be at a fixed rate potentially.
You need to decide which machines you want to run, get the necessary licenses to operate them (you're selling items so you need to get sales licenses and whatnot from your state), buy the machines and a truck for the items in the machines, find a supplier of the products, and then finally you can secure locations. Finally, you need to service them periodically or hire someone to service them.
Passive income differs from earned income and portfolio income in a variety of ways. Passive income is generally defined as a stream of income earned with little effort, and it is referred to as progressive passive income when there is little effort needed from the individual receiving the passive income in order to grow the stream of income. Examples of passive income include rental income and any business activities in which the earner does not materially participate during the year.
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.