Calendar-year corporations: Pay the second installment of 2025 estimated income taxes and complete Form 1120-W for the corporation’s records.

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

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

Individuals: File a 2024 individual income tax return (Form 1040 or Form 1040-SR) or file for a four-month extension (Form 4868) if you live outside the United States and Puerto Rico or you serve in the military outside those two locations. Pay any tax, interest and penalties due.

Individuals: Pay the second installment of 2025 estimated taxes (Form 1040-ES) if not paying income tax through withholding or not paying sufficient income tax through withholding.