2021 Small Business Tax Calendar

January 2021

Jan. 15, 2021: Quarterly estimated tax payments for Q4 2020 is due.
Jan. 31, 2021: Form 1099-MISC is due to contractors.

February 2021

Feb. 1, 2021: Form 1099-NEC (Non-Employee Compensation) is due to contractors and the IRS. (In 2021, the usual due date, January 31st, falls on a Sunday so the deadline is moved to Monday, February 1st)
Employer - Form W-2 due to employees and SSA.

March 2021  

March 1, 2021: Form 1099-MISC is due to the IRS if filed on paper.
March 15, 2021: S-corporation and partnership corporate income tax returns are due.
If your business is a partnership, the IRS requires you to file form 1065.
If your business is an S-corp, the IRS requires that you file form 1120-S.
This is also the final day for businesses set up as partnerships or S-corps to request a six-month tax extension. Keep in mind that an extension allows you extra time to file, but does not extend the time you have to actually pay your income tax.
March 31, 2021: Form 1099-MISC is due to the IRS if filed electronically.

April 2021

April 15, 2021: Sole-proprietorship and LLC income taxes are due today. File your Form 1040, 1040-A or 1040-EZ today, and pay any additional taxes you might owe that you didn’t pay in quarterly estimated taxes.
C-corporation income tax is due today. The IRS requires that you file Form 1120.
Q1 2021 quarterly estimated taxes are due.
Today is the final day to request a six-month tax extension on your time to file your income tax return.

May 2021

May 17, 2021: Tax-exempt organizations - form 990 is due today.
Today is the final day to request a six-month tax extension on your time to file your form 990.

June 2021

June 15, 2021: Deadline to pay Q2 2021 quarterly estimated taxes.

August 2021

August 2, 2021: Employee benefits plans - form 5500 is due today.

September 2021

Sept. 15, 2021: Deadline to pay Q3 2021 quarterly estimated taxes.
This is also the income tax filing deadline for partnerships and S-corps that requested a six-month income tax filing extension.

October 2021

Oct. 15, 2021: Final day for those who file business sales tax as an individual (sole proprietorships, LLCs, etc.) and C-corps that requested a six-month tax-filing extension to file income tax.

January 2022

Jan. 17, 2022: Deadline to pay Q4 2021 quarterly estimated taxes.
Jan. 31, 2022: Form 1099-MISC is due to contractors.