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Tax Deadlines – September 15
- 3rd quarter estimated tax payments due for the 2017 tax year (individuals and calendar-year corporations).
- Final deadline to file calendar year-end corporate tax returns for the year 2016 if an extension was requested. (Forms 1120, 1120S).
- June 30 year-end C corporations corporate tax due. If applying for an extension, you will receive a seven-month extension (due April 16, 2018).
- Final deadline to file partnership tax returns (Form 1065) for the year 2016 if an extension was requested.