Nice. However I must ask, the official tax department's site has been revamped and added a very slick calculator [1] a few months or maybe a year ago. Is there a good reason to prefer yours ?

However, if you are an expert in tax rules, here's something I'd pay money for - clear tax guidance in the form of a decision engine, where I can feed my inputs and get an accurate interpretation of the tax rules. I will pay for this as long as you can back the interpretation by a certified tax consultant.

[1] http://www.incometaxindia.gov.in/Pages/tools/income-tax-calc...