Tax Deadline Dates...

Special Dates:
January 15th-Fourth Estimated Tax Due for Individuals
January 31st-Quarterly and Yearly Payroll Reports Due
(Forms 941, 940, TWC, W-2s, 1099s)
March 15th-Corporate Federal Tax Returns Due (Form 1120 & 1120S)
April 15th-Individual Federal Tax Returns Due (Form 1040)
April 15th-First Estimated Tax Payment Due for Individuals
April 30th-First Quarter Payroll Reports Due
May 15th-Texas Franchise Reports Due
June 15th-Second Estimated Tax Payments Due for Individuals
July 31st-Second Quarter Payroll Reports Due
September 15th-Third Estimated Tax Due for Individuals
October 15th-Individual Federal Tax Returns Due for those with Extensions
October 31st-Third Quarter Payroll Reports Due
January 15th-Fourth Estimated Tax Due for Individuals

These dates along with other information such as various publications and forms (W-4, W-9, etc) can be found on the IRS Website.