March 15 Deadline - Partnerships and S Corps
The deadline for filing calendar-year partnership and S corporation returns is March 15, 2019. These returns must be filed (e-filed or postmarked) by midnight (local time) on March 15, 2019. Fiscal-year returns will be due the 15th day of the 3rd month following the year-end.
Both partnership and S corporation returns are allowed a six-month extension. Payment must accompany the return or extension if there are taxes due. An extension of time to file does not extend the time to pay taxes.
April 15 Deadline - Individuals, C Corps, Estates, and Trusts
The federal deadline for filing calendar year individual, C corporation, estate, and trust returns is April 15, 2019.
Residents of Maine and Massachusetts
Residents of Maine and Massachusetts have until, April 17, 2019, to submit calendar year individual, C corporation, estate, and trust returns, due to an official holiday - Patriots' Day - in these two states which falls on April 15, 2019, and Emancipation Day, a holiday in Washington D.C., which falls on April 16, 2019.