ITR-U, or the updated income tax return, is a document that enables taxpayers to amend their income tax returns by correcting mistakes or filling in missing information. It also permits individuals who have not submitted their returns by the deadline to file their ITR, even if they have overlooked the chances to file a belated or revised return, within a period of FOUR YEARS following the conclusion of the relevant assessment year. This is a chance provided by the income tax department for taxpayers to report and pay taxes on that income via ITR-U. Depending on the circumstances, the income tax department might take necessary actions.