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 ?<p>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.<p>[1] <a href="http://www.incometaxindia.gov.in/Pages/tools/income-tax-calculator.aspx" rel="nofollow">http://www.incometaxindia.gov.in/Pages/tools/income-tax-calc...</a>