March 10

Individuals: Reporting February tip income of $20 or more to employers (Form 4070).

March 17

S Corporations: Filing a 2024 income tax return (Form 1120S) or filing for an automatic six-month extension (Form 7004), and paying any tax due.

Partnerships: Filing a 2024 income tax return (Form 1065 or Form 1065-B) or requesting an automatic six-month extension (Form 7004).

March 21

Employers: Electronically filing 2024 Form 1097, Form 1098, Form 1099 (other than those with an earlier deadline) and Form W-2G.