File a 2013 calendar year income tax return (Form 1120S) and pay any tax due. Provide each shareholder with a copy of Schedule K-1 (Form 1120S), Shareholder's Share of Income, Deductions, Credits, etc., or a substitute Schedule K-1. If you want an automatic 6-month extension of time to file the return, file Form 7004 and deposit what you estimate you owe.
S corporation election. File Form 2553, Election by a Small Business Corporation, to elect to be treated as an S corporation beginning with calendar year 2014. If Form 2553 is filed late, S treatment will begin with calendar year 2015.
File a 2013 calendar year income tax return (Form 1120S) and pay any tax due. This due date applies only if you timely requested an automatic 6-month extension. Otherwise, see March 17. Provide each shareholder with a copy of Schedule K-1 (Form 1120S) or a substitute Schedule K-1.
If you operate on a fiscal year, see tax calendar information for Fiscal-Year Taxpayers.
October 10 (Employees who work for tips)
If you received $20 or more in tips during September, report them to your employer - Details
October 13 (Everyone)
Federal Holiday (Columbus Day) - Details
October 15 (Individuals)
If you have an automatic 6-month extension to file your income tax return for 2013, file Form 1040, 1040A, or 1040EZ and pay any tax, interest, and penalties due - Details
October 15 (Partnerships)
Electing large partnerships: File a 2013 calendar year return (Form 1065-B). This due date applies only if you were given an additional 6-month extension - Details