If you are a U.S. citizen or resident alien living and working (or on military duty) outside the United States and Puerto Rico, file Form 1040 and pay any tax, interest, and penalties due. Otherwise, see April 18. If you want additional time to file your return, file Form 4868 to obtain 4 additional months to file. Then file Form 1040 by October 17.
However, if you are a participant in a combat zone you may be able to further extend the filing deadline.
Social Security, Medicare, and withheld income tax. File Form 941 for the first quarter of 2016. Deposit any undeposited tax. (If your tax liability is less than $2,500, you can pay it in full with a timely filed return.) If you deposited the tax for the quarter in full and on time, you have until May 10 to file the return.
Federal unemployment tax. Deposit the tax owed through March if more than $500.
File a 2015 calendar year return (Form 1065-B). If you want an automatic 6-month extension of time to file the return, file Form 7004. Then file Form 1065-B by October 17. See March 15 for the due date for furnishing the Schedules K-1 to the partners.
File an income tax return for 2015 (Form 1040, 1040A, or 1040EZ) and pay any tax due. If you want an automatic 6-month extension of time to file the return, file Form 4868, Application for Automatic Extension of Time To File U.S. Individual Income Tax Return, or you can get an extension by phone if you pay part or all of your estimate of income tax due with a credit card. Then file Form 1040, 1040A, or 1040EZ by October 17.
If you paid cash wages of $1,900 or more in 2015 to a household employee, file Schedule H (Form 1040) with your income tax return and report any employment taxes. Report any federal unemployment (FUTA) tax on Schedule H (Form 1040) if you paid total cash wages of $1,000 or more in any calendar quarter of 2014 or 2015 to household employees.
File a 2015 calendar year return (Form 1065). Provide each partner with a copy of Schedule K-1 (Form 1065), Partner's Share of Income, Credits, Deductions, etc., or a substitute Schedule K-1. If you want an automatic 5-month extension of time to file the return and provide Schedule K-1 or a substitute Schedule K-1, file Form 7004. Then file Form 1065 by September 15.
File copies of all the Forms W-2 (Wage and Tax Statement) and W-2G (Certain Gambling Winnings) you issued for 2015. This due date applies only if you electronically file. Otherwise, see February 29. The due date for giving the recipient these forms remains February 1.
File a 2015 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, Credits, Deductions, 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.