Here are some key tax deadlines for businesses during the second quarter of 2022. APRIL 18: If you’re a calendar-year corporation, file a 2021 income tax return (Form 1120) or file for a six-month extension (Form 7004) and pay any tax due. APRIL 18: Corporations pay the first installment of 2022 estimated income taxes. MAY 2: Employers report income tax withholding and FICA taxes for Q1 2022 (Form 941) and pay any tax due. JUNE 15: Corporations pay the second installment of 2022 estimated income taxes. Contact us to learn more about filing requirements and ensure you meet all applicable deadlines.