Last quarterly estimated payment for 2017 is due January 16, 2018.
Jan. 31 is the due date for employers to provide W-2 statements to employees, and to file Forms W-2 with the SSA (both paper and electronic forms).
If you’re an employer, you must file 2017 federal unemployment tax returns and pay any tax due by Jan. 31. This is Form 940.
Most 4th quarter and annual payroll tax returns are due January 31st.