Calendar-year partnerships: File a 2024 income tax return (Form 1065 or Form 1065-B) and provide each partner with a copy of Schedule K-1 (Form 1065) or a substitute Schedule K-1 — or request an automatic six-month extension (Form 7004).

Calendar-year S corporations: File a 2024 income tax return (Form 1120-S) and provide each shareholder with a copy of Schedule K-1 (Form 1120-S) or a substitute Schedule K-1 — or file for an automatic six-month extension (Form 7004). Pay any tax due.

Employers: Deposit Social Security, Medicare and withheld income taxes for February if the monthly deposit rule applies.

Employers: Deposit nonpayroll withheld income tax for February if the monthly deposit rule applies.