MARCH

15 – Deadline for calendar-year corporations to elect S corporation status for 2016.

15 – Deadline for filing 2015 tax returns for calendar-year corporations.

31 – Deadline for payers who file electronically to file 2015 information returns (such as 1099s) with the IRS.

31 – Deadline for employers who file electronically to send copies of 2015 W-2s to the Social Security Administration.

31 – Deadline for providing a copy of Form 1095-C to the recipient of health insurance coverage.

APRIL

18* – 2015 individual income tax returns are due.

18* – 2015 partnership returns are due.

18* – 2015 annual gift tax returns are due.

18* – Deadline for making 2015 IRA contributions.

18 – Due date for first installment of 2016 individual estimated tax.

MAY

16 – Deadline for calendar-year nonprofit organizations to file annual reporting returns.

31 – Deadline for filing Form 1095-C with the IRS.

* April 19 for taxpayers in Maine and Massachusetts.