hmmmmm...
I agree with Skud here!!
Actually when people start to make huge money, they start thinking of keeping the most part of it with them, and either paying a small amount of tax or simply paying no tax.
In most cases, people do pay the tax but a lesser amount.
Now the question is
Why would you pay the TAX for ? heck, I know all of you will say, govt. collects taxes to build good roads, give good facilities for rural education, etc, etc.
But tell how good our govt. actually is, do they actually make roads ?
The answer is NO, we are forced to live in hell!!
Hence, the person(say business man) who earn a huge amount of money by doing his hard work, does not feel to give a penny to this idiot govt. (he is justified in his dicission I guess!

). And that's how "black money" gets created.
I will never pay tax to this govt. which actually eats my money and does nothing, so I am better off to put it in swiss bank then.
So, that's the concept of "Black Money" if I am not wrong.