I have sold a plot in Delhi in November of 2010 for Rs. 30 lacs (This plot was purchased in 2006 for Rs. 10 lacs). I want to understand what is my tax liability? Also I have purchased another flat in July 2010 (construction linked payment) in joint ownership with my son. If I am making the payments for this flat to the amount which is equal to the sale price of the plot,within a period of one year, then will I be exempt from Capital gains tax?