Tax Calendar
January
January 15th, 2021
- Deposit Federal payroll taxes for December 2020 if a monthly depositor
January 6, 2021
- Final December 2020 Quarter-Monthly Withholding and Sales Tax Payment
January 31, 2021
- St Louis City 4th Quarter 2020 Form W-10 and P-10 Due
January 31, 2021
- St Louis City Annual W-3 reconciliation due
February
February 1, 2021
- 1099 NEC and 1099 MISC to vendors and the IRS
- W-3 and W2 forms to employees and the IRS
- File Form 940, 941, 943 payroll tax returns and make payments due
- Sales/Use tax returns and payments due
February 16, 2021
- Deposit Federal payroll taxes for January if a monthly depositor
February 1, 2021
- 2020 Form MO W-3 due
February 1, 2021
- 2020 Annual, Monthly, and Quarterly Withholding, Sales and Use, Tire and Battery Fee Return
February 16, 2021
- Monthly Withholding Tax Return
February 22, 2021
- Monthly Sales and Use Tax Return
February 15, 2021
- Form W-11 Monthly Withholding for January due
March
March 15, 2021
- Tax returns due for S-Corporations and multi-member LLCs/Partnerships
- Deposit Federal payroll taxes for February if a monthly depositor
March 15, 2021
- Calendar Year Cooperatives (Form MO-1120) with an
- Automatic Extension
- Monthly Withholding Tax Return
March 22, 2021
- Monthly Sales and Use Tax Return
- Monthly Tire and Battery Fee Return
March 1, 2021
- St. Louis County Business personal property declaration due
March 1, 2021
- St. Charles County Business personal property declaration due
March 1, 2021
- St Louis City Annual Business 1099 Report (Form E-6)
March 15, 2021
- Form W-11 Monthly Withholding for February due
April
April 15th, 2021
- Tax returns due for C-Corporations, Sole Proprietors, and Single-Member LLCs as well as personal 1040 returns.
- Pay 1st installment of 2021 estimated tax
April 15th, 2021
- Deposit Federal payroll taxes for March if a monthly depositor
April 30th, 2021
- File 1st Quarter Form 941
April 15, 2021
- Annual Business and Individual Consumer’s Use Tax Return
- Form MO-1120ES
- Form MO-1040-ES
- Form MO – 1065
- Form MO – 1120
- Form MO – 1120S
- Form MO – 1040V
April 30, 2021
- Monthly and Quarterly Withholding, Sales and Use, and Tire and Battery Fee
April 1, 2021
- St. Louis City Business personal property declaration due
April 15, 2021
- St Louis City Form E-234 Return is due
April 30, 2021
- St Louis City 1st Quarter 2021 Form W-10 and P-10 Due
May
May 17th, 2021
- Deposit Federal payroll taxes for April if a monthly depositor
May 17, 2021
- Forms MO-1120 and MO-7004 for those filing Federal Form 990-T
- Monthly Withholding Tax Return
May 20, 2021
- Monthly Sales and Use Tax Return
May 15, 2021
- Form W-11 Monthly Withholding for April due
June
June 15th, 2021
- Individuals and Corporations – Pay the 2nd installment of 2021 estimated tax
June 15th, 2021
- Deposit Federal payroll taxes for May if a monthly depositor
June 15, 2021
- Form MO-1040ES
- Form MO – 1120ES
- Monthly Withholding Tax Return
June 21, 2021
- Monthly Sales and Use Tax Return
July
July 15th, 2021
- Deposit Federal payroll taxes for June if a monthly depositor
July 6, 2021
- Quarter-Monthly Withholding and Sales Tax Payment
August
August 2nd, 2021
- File 2nd Quarter Form 941
August 2nd, 2021
- Deposit FUTA owed through June if more than $500
August 16th, 2021
- Deposit Federal payroll taxes for July if a monthly depositor
August 2, 2021
- Monthly and Quarterly Withholding, Sales and Use, and Tire and Battery Fee Return
September
September 15th, 2021
- Deposit Federal payroll taxes for August if a monthly depositor
September 15th, 2021
- Individuals and Corporations – Pay the 3rd installment of 2021 estimated tax
September 15th, 2021
- S Corporation and Partnership returns due if a 6-month extension was requested.
September 15, 2021
- Form MO-1040ES
- Form MO – 1120ES
- Monthly Withholding Tax Return
September 20, 2021
- Monthly Sales and Use Tax Return
- Monthly Tire and Battery Fee Return
October
October 15th, 2021
Deposit Federal payroll taxes for September if a monthly depositor
October 15th, 2021
- Individuals and Corporation returns due if a 6-month extension was requested
October 15, 2021
- Form MO-1040 with Extension
November
November 1st, 2021
- File 3rd Quarter Form 941
November 1st, 2021
- Deposit FUTA owed through September if more than $500
November 15th, 2021
- Deposit Federal payroll taxes for October if a monthly depositor
November 1, 2021
- Monthly and Quarterly Withholding, Sales and Use, and Tire and Battery Fee
November 15, 2021
- Form MO – 1120 for those filing Federal Form 990-T with extension
- Monthly Withholding Tax Return
November 22, 2021
- Monthly Sales and Use Tax Return
- Monthly Tire and Battery Fee Return
December
December 15th, 2021
- Deposit Federal payroll taxes for November if a monthly depositor
December 15th, 2021
- Corporations – Pay the 4th installment of 2021 estimated tax
December 15, 2021
- Form MO – 1120ES
- Monthly Withholding Tax Return
December 20, 2021
- Monthly Sales and Use Tax Return
- Monthly Tire and Battery Fee Return
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Source: State of MO Tax Calendar
