AUGUST 2: Employers report income tax withholding and FICA taxes for second quarter 2021 (Form 941) and pay any tax due. File a 2020 calendar-year retirement plan report (Form 5500 or Form 5500-EZ) or request an extension.
SEPT. 15: If a calendar-year S corporation or partnership that filed an automatic extension, file a 2020 income tax return. If a calendar-year C corp., pay the third installment of 2021 estimated income taxes.
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