For the year 2004-05 you were Indian resident so you had to file the return.For 2005-06 you were a non resident so you did not have to file any return assuming you did not have to pay any tax in India.Now for 2006-07 you are again a non resident as you returned only in June 2007.But tax has been deducted from Jan 2007 itself.So if the tax to be paid by you is less than what has been deducted for the period Jan to mar 2007,you are advised to file return and claim the refund.You must be having PAN.Even if filing the return is not mandatory you can still file it.And you are in any case advised to do so even for 2006-07 as without this you cannot claim refund of the tax deducted at source.You may show all your foreign income as exempt from tax as you were not a resident in 2006-07.
