Updated Income Tax Return or ITR-U, as the name suggests is to update the already filed Income Tax Return. Through this ITR, the taxpayers can update their ITR of the last two assessment years. Therefore, as of now, returns for 2019-20 and 2020-21 fiscals can be updated. The filing, however, requires stating payment of additional tax. Further, the taxpayer will also have to give reasons for updating the income tax return.