Calendar-year exempt organizations: File a 2024 information return (Form 990, Form 990-EZ or Form 990-PF) if a six-month extension was filed. Pay any tax, interest and penalties due.

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

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