March 10
- Employees who work for tips – If you received more than $20 in tips during February, report them to your employer.
March 17
- Social security, Medicare, and withheld income tax – If the monthly deposit rule applies, deposit the tax for payments made in February.
- Nonpayroll withholding – If the monthly deposit rule applies, deposit the tax for payments made in February.
- Partnerships – File a 2024 calendar year return (Form 1065). Provide each partner with a copy of their Schedule K-1 (Form 1065), Partner’s Share of Income, Deductions, Credits etc., or substitute Schedule K-1 (Form 1065), and, if applicable, Schedule K-3 (Form 1065), Partner’s Share of Income, Deductions, Credits etc. – International, or substitute Schedule K-3 (Form 1065).
- S Corporations – File a 2024 calendar year income tax return (Form 1120-S) and pay any tax due. Provide each shareholder with a copy of their Schedule K-1 (Form 1120-S), Shareholders Share of Income, Deductions, Credits, etc., or substitute Schedule K-1 (Form 1120-S), and if applicable, Schedule K-3 (Form 1120-S), Shareholder’s Share of Income, Deductions, Credits, etc., – International, or substitute Schedule K-3 (Form 1120-S).
March 31
- Electronic filing of Forms 1097, 1098, 1099, 3921, 3922 and W-2G