Hello Phani,

First, I'm sure you can find a ton of information on annuities as they are quite common financial instruments.  But here is what I know off the top of my head.

Annuities are financial instruments that you purchase by giving the company that offers the annuity (often insurance companies) a lump sum of money today.  In return, they give you periodic payments of principal and interest for a specified number of years.  A lot of people use this form of financial instrument to gaurantee a steady amount of income in retirement.

Some annuities start paying out right away, while other may deferred the payments and grow with the interest being tax free.  Then you would receive all of the money (principal and interest) at the end of the period and get taxed only once on the final amount of interest.

Most BAs wouldn't deal with this kind of work.  Typically, this would be done by a financial analyst or financial advisor.  With that said, some Business Analysts don't focus on IT systems at all and do take on a partial role of financial analyst along with other tasks such as focusing on a companies strategic growth.