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Deadline Notice

 If a calendar-year C corporation, pay the third installment of 2018 estimated income taxes.
 

If a calendar-year S corporation or partnership that filed an automatic six-month extension:

File a 2017 income tax return (Form 1120S, Form 1065 or Form 1065-B) and pay any tax, interest and penalties due.

Make contributions for 2017 to certain employer-sponsored retirement plans.

Earlier Event: June 15
Deadline Notice
Later Event: July 15
Tax Notice