March 15 - IRS Payroll Taxes Due (Monthly Filers)
March 15 - Withholding Taxes Due (Monthly Filers)
March 15 - K1 Returns Due
March 20 - Sales Taxes (Monthly Filers)
April 15 - Estimated Tax Payment Due
April 15 - Withholding Taxes Due (Monthly Filers)
April 15 - IRS Payroll Taxes Due (Monthly Filers)
April 15 - Tax Returns Due
April 20 - Sales Taxes (Monthly and Quarterly Filers)
January 31 - 941 Due
January 31 - State Withholding Taxes Due (Quarterly Filers)
May 15 - IRS Payroll Taxes Due (Monthly Filers)
May 15 - Withholding Taxes Due (Monthly Filers)
May 15 - 990 Tax Returns Due
May 20 - Sales Taxes (All Filers)