This year, the tax deadline falls on April 18, 2016

1. or April 19, 2016, for people in Maine and Massachusetts

2. Extended deadline is October 17, 2016

Estimated tax payments (Form 1040ES)

1. April 18, 2016

2. June 15, 2016

3. September 15, 2016

4. January 17, 2017

Partnership returns (Form 1065)

1. First deadline is April 18, 2016

2. or April 19, 2016, for partnerships in Maine and Massachusetts

3. Extended deadline is September 15, 2016

Trust and Estate income tax returns (Form 1041)

1. First deadline is April 18, 2016

2. or April 19, 2016, for trusts and estates in Maine and Massachusetts

3. Extended deadline is September 15, 2016

Corporation income tax returns (Forms 1120 and 1120-S)

1. First deadline is March 15, 2016 (for corporations on a calendar year)

2. Extended deadline is September 15, 2016

Foreign Bank Account Reports (FinCen Form 114)

1. Deadline is June 30, 2016. No extensions are available.

Reference: http://taxes.about.com/od/Federal-Income-Taxes/qt/tax-deadlines.htm