Hi and welcome to Just Answer!
If you are US citizen pr US resident - you will report the sale transaction on your US tax return regardless where the property is located and regardless to whom it is siold.
The capital gain = (sale price) - (basis)
The basis is mainly a purchase price (assuming teh property was purchased) adjusted by improvements and some other expenses depending what is your property.
I am US resident on work visa, have been filing taxes for last 6 yrs.
do i have submit prove of purchase and improvements made in India
Generally - you will report the sale transaction on the schedule D - www.irs.gov/pub/irs-pdf/f1040sd.pdf
part I or part II depending if you owned teh property more or less than a year.
Long term capital gain rate (not more than 15%) will be used if the property was held more than a year.
do I need to attach documents from India of when the property was purchased alongwith schedule D
if the property sale is considered short term gain, then what is the maximum tax applicable.
are you still there and have you logged off.
Sorry for delay. You do not need to attach any documents to your tax return. You will need to provide documents if you will be audited.
If you held the property less than a year - the gain will be taxed at your regular tax rate depending on your total taxable income.
thanks lev for your help, have a nice day