January 17 – Due date for the fourth installment of 2016 estimated tax.
January 31 – Employers must furnish W-2 statements to employees. 1099 information statements must be furnished by banks, brokers, and other payers.
January 31 – Employers must file 2016 federal unemployment tax returns and pay any tax due.
January 31 – Payers must file information returns (such as 1099s) with the IRS.
January 31 – Employers must send W-2 copies to the Social Security Administration.
March 1 – Farmers and fisherman who did not make 2016 estimated tax payments must file 2016 tax returns and pay taxes in full.
March 15 – 2016 partnership and S corporation returns or extensions are due.
March 15 – Deadline for calendar-year corporations to elect S corporation status for 2017.
April 18 – Individual income tax returns or extensions for 2016 are due.
April 18 – 2016 calendar year corporation income tax returns or extensions are due.
April 18 – Deadline for making 2016 IRA contributions.
April 18 – First installment of 2017 individual estimated tax is due.
June 15 – Second installment of 2017 individual estimated tax is due.
September 15 – Third installment of 2017 individual estimated tax is due.
October 16 – Deadline for filing your 2016 individual tax return if you filed for an extension by the April 18 deadline.
January 16, 2018 – Fourth installment of 2017 individual estimated tax is due.