Tax Calendar May 2017
Individuals. If you are not paying your 2017 income tax through withholding (or will not pay enough tax during the year that way), pay the second installment of your 2017 estimated tax.
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 for 2016. If you want additional time to file your return, file Form 4868 to obtain four additional months to file, then file Form 1040 by October 16.
Corporations. Deposit the second installment of estimated tax for 2017.
Employers. For Social Security, Medicare, withheld income tax, and nonpayroll withholding, deposit the tax for payments in May if the monthly rule applies.