* Freelance writing: Quality freelance writing takes tremendous effort. Ironically, the better the quality of your writing, the more you don’t want to freelance and just keep the articles for your own site. Freelancing is a great way to earn side income, however, it’s not really for me. I’ll probably take on one or two freelance jobs maximum per year and write no more than four articles a month elsewhere.

India has an underground economy, with a 2006 report alleging that India topped the worldwide list for black money with almost $1,456 billion stashed in Swiss banks. This would amount to 13 times the country's total external debt.[385][386] These allegations have been denied by the Swiss Banking Association. James Nason, the Head of International Communications for the Swiss Banking Association, suggested "The (black money) figures were rapidly picked up in the Indian media and in Indian opposition circles, and circulated as gospel truth. However, this story was a complete fabrication. The Swiss Bankers Association never published such a report. Anyone claiming to have such figures (for India) should be forced to identify their source and explain the methodology used to produce them." A recent step taken by Prime Minister Modi, on 8 November 2016, involved the demonetization of all 500 and 1000 rupee bank notes (replaced by new 500 and 2000 rupee notes) in order to return black money into the economy.[387][388]

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.