2021 Q3 Tax Calendar: Key Deadlines for Businesses & Other Employers

q3 taxes 2021Here are some key tax-related deadlines for businesses and other employers during the third quarter of 2021.


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.


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.

Accounting Freedom: Small Business Accounting Company

Contact us for more about the filing requirements and to ensure you meet all applicable deadlines.