Today, it isn’t enough to just build an app and expect to make millions of dollars from it. Since everyone is doing it, you’ll need to ensure you not only build something great, but that you can also get the proverbial word out. You can make money online with apps today, but it’s definitely harder than it once was, so be sure to set your expectations the right way.
Establishing residual income allows you to accumulate wealth faster, have a more flexible lifestyle and maintain a diverse financial portfolio. As with any successful investment, hard work is required. With residual income, however, that work tends to be upfront. Once your revenue stream is established, the work and time involved is significantly lower than active income sources. With residual income, you’ll secure funds for your future, have a better idea of where you stand financially and enjoy peace of mind knowing you’re maintaining lucrative, long-term investments.  
There is a specific tax definition of passive income, known as “passive activity” to the Internal Revenue Service. Passive income is any income you make without actively working or are materially involved. The IRS defines it as any rental activity or any business in which the taxpayer does not “materially participate.” Nonpassive activities, or active activities, are businesses in which the taxpayer works on a regular, continuous, and substantial basis.
If you’re considering real estate for your portfolio, let me give you some advice: Don’t jump in without a ton of research. It’s not as easy as they make it look on shows like Flip or Flop. There’s a lot that goes into becoming a successful landlord or flipping houses for a profit. Plus, a lot can go wrong and your mistakes can eat up your profits quickly.
I’m selling a piece of land which costs me $7k in negative cash flow due to property taxes, I wrestle with the idea of using the 1031 exchange and put the proceeds into a rental. In this manner, I would save $70k in capital gains tax, and turn my negative $7k in cash flow into something positive. The idea of being a landlord though pains me. Just don’t know if it’s worth the hassle; clearly not if I make it back to the corporate world.
In equity valuation, residual income represents an economic earnings stream and valuation method for estimating the intrinsic value of a company's common stock. The residual income valuation model values a company as the sum of book value and the present value of expected future residual income. Residual income attempts to measure economic profit, which is the profit remaining after the deduction of opportunity costs for all sources of capital.