10 guaranteed ways to become a millionaire before 30

4. Develop multiple streams of income

One way to earn more is to increase your streams of income.

In author Thomas C. Corley’s five-year study of self-made millionaires he found that many of them develop multiple streams of income: 65% had three streams, 45% had four streams, and 29% had five or more streams.

These additional streams include real-estate rentals, stock market investments, and part-ownership in a side business.

“Three streams of income seems to be the magic number for the self-made millionaires in my Rich Habits study, but the more income streams you can create in life, the more secure will your financial house be,” he writes.