Let's say they have a black money of 1 lakh. They purchase a policy of 1 lakh single premium. Now LIC doesn't care or check about the source of the income. So they issue the policy bond. Now the person can sleep at ease because if Income Tax officials do a raid, they won't find the money. However, there is the problem of the policy bond. That can be found by the IT officials. Solution is simple and ingenious. The businessman would take a loan of a small amount (say, a hundred rupees) from LIC. Now, LIC would take the policy bond as a collateral. So in effect, LIC takes care of the safe-keeping of the policy document. The tenure of the loan will usually match the tenure of the LIC policy. So at the end of term (say, 5 years), the businessman gets back the bond which he then uses to liquidate the original investment. Now this money is white as it is the maturity proceeds of an insurance policy. Since IT officials can only dig through three years of paper, they cannot question on the source of funds of the insurance premium. Neat, isn't it ?
Here I am - suggesting simple things like term insurance and mutual funds. So naive !!