Employees who work for tips
If you received $20 or more in tips during January, report them to your employer.
If you claimed exemption from income tax withholding last year on the Form W-4, Employee's Withholding Allowance Certificate, you gave your employer, you must file a new Form W-4 by this date to continue your exemption for another year
Give annual information statements to recipients of certain payments you made during 2017.
File information returns (for example, certain Forms 1099) for certain payments you made during 2017.