- March 3 - Health coverage reporting to employees. If you're an Applicable Large Employer, provide Form 1095-C, Employer-Provided Health Insurance Offer and Coverage, to full-time employees. For all other providers of minimum essential coverage, provide Form 1095-B, Health Coverage, to responsible individuals. See the Instructions for Forms1094-B and 1095-B, and the Instructions for Forms 1094-C and 1095-C for more information about the information reporting requirements.
- March 10 - Employees who work for tips. If you received $20 or more in tips during February, report them to your employer. See Pub. 531 for more information on how to report tips to your employer.
- March 17 - 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 Sched-ule K-1 (Form 1065), and, if applicable, Schedule K-3 (Form 1065), Partner’s Share of Income, Deductions, Credits, etc.—Inter-national, or substitute Schedule K-3 (Form 1065).To request an automatic 6-month extension of time to file the return, file Form 7004. Then, file the return and provide each partner with a copy of their final or amended (if required) Schedule K-1 (Form 1065) and, if applicable, Schedule K-3 (Form 1065) by September 15.
- 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), Shareholder's Share of Income, Deductions, Credits, etc., or substitute Schedule K-1 (Form 1120-S), and, if applicable, Sched-ule K-3 (Form 1120-S), Shareholder’s Share of Income, Deductions, Credits, etc.—Inter-national, or substitute Schedule K-3 (Form 1120-S).
- To request an automatic 6-month extension of time to file the return, file Form 7004 and de-posit what you estimate you owe in tax. Then, file the return; pay any tax, interest, and penal-ties due; and provide each shareholder with a copy of their Schedule K-1 (Form 1120-S) and, if applicable, Schedule K-3 (Form 1120-S) by September 15.
- 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.
- March 31 - S corporation election. File form 2553 to elect to be treated as an S corporation beginning with calendar year 2025. If Form 2553 is filed late, S corporation treatment will begin with calendar year 2026.
- Electronic filing of Forms 1097, 1098, 1099, 3921, 3922, and W-2G. File Forms 1097, 1098, 1099 (except a Form 1099-NEC reporting nonemployee compensation), 3921, 3922, and W-2G with the IRS. This due date applies only if you file electronically. Otherwise, see All businesses under February 28, earlier. The due date for giving the recipient these forms generally remains January 31. For information about filing Forms 1097, 1098, 1099, 3921, 3922, and W-2G electronically, see Pub. 1220.
- Second Quarter. The second quarter of a calendar year is made up of April, May and June.
- March 31 - Electronic filing of Forms W-2G. File copies of all the Forms W-2G you issued for 2024. This due date applies only if you electronically file. Otherwise, see Payers of gambling winnings under February 28, earlier. The due date for giving the recipient these forms remains January 31. For information about filing Forms W-2G electronically, see Pub. 1220.
- Electronic filing of Forms 8027.File Forms 8027 for 2024. This due date applies only if you electronically file. Otherwise, see Large food and beverage establishment employers under February 28, earlier.
- Electronic filing of Forms 1094-C and 1095-C and Forms 1094-B and 1095-B.If you’re an Applicable Large Employer, file electronic Forms 1094-C and 1095-C with the IRS. For all other providers of minimum essential coverage, file electronic Forms 1094-B and 1095-B with the IRS. Otherwise, see Health coverage reporting to IRS under February 28, earlier.
- Second Quarter
The second quarter is made up of April, May, and June.
- March 31 - Electronic filing of Forms W-2G. File copies of all the Forms W-2G you issued for 2024. This due date applies only if you electronically file. Otherwise, see Payers of gambling winnings under February 28, earlier. The due date for giving the recipient these forms remains January 31. For information about filing Forms W-2G electronically, see Pub. 1220.
- Electronic filing of Forms 8027.File Forms 8027 for 2024. This due date applies only if you electronically file. Otherwise, see Large food and beverage establishment em-ployers under February 28, earlier.
- Electronic filing of Forms 1094-C and 1095-C and Forms 1094-B and 1095-B.If you’re an Applicable Large Employer, file electronic Forms 1094-C and 1095-C with the IRS. For all other providers of minimum essential coverage, file electronic Forms 1094-B and 1095-B with the IRS. Otherwise, see Health coverage reporting to IRS under February 28, earlier.
- Second Quarter The second quarter is made up of April, May, and June.