Last date to file your Income Tax return for financial year 2019-20 is December 31 The last date to file your Income Tax return (ITR) for financial year 2019-20 (assessment year 2020-21) is December 31. The Income Tax Department had extended the due date for filing the ITR, to ease the tax-filing process for assessees in view of the coronavirus pandemic. Normally, the due date for filing ITRs for all assessees whose accounts are not required to be audited is July 31. If taxpayers fail to file their returns by due date then the Income Tax department levies late return filing penalty of Rs 10,000.