Tax Due Dates for the Remainder 2021
September 15, 2021: Deadline for third-quarter estimated tax payments for the 2021 tax year
September 15, 2021: Final deadline to file partnership and S corporation tax returns for tax year 2020, if an extension was requested (Forms 1065 and 1120-S)
October 15, 2021: Final extended deadline to file individual and corporate tax returns for the year 2020 (Form 1040 and Form 1120)
October 15, 2021: Deadline for taxpayers who earned $69,000 or less in adjusted gross income (AGI) for tax year 2020 to use Free File to prepare and file their returns
January 15, 2022: Deadline for fourth-quarter estimated tax payments for the 2021 tax year