If you are an NRI and are looking at the best way to file your tax returns, here is a quick guide. We also help you understand if you need to file a return in the first place.July 31st is the last date for filing your Indian income tax returns for the financial year 2010-2011. If you are a Non Resident Indian (NRI) and are looking at the best way to file your tax returns, here is a quick guide on various options, including e-filing. This guide will also help you understand if you need to file a return in the first place.