May 2026

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May 11Individuals – Report April tip income of $20 or more to employers (Form 4070).
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May 11Employers – Report Social Security and Medicare taxes and income tax withholding for first quarter 2026 (Form 941) if all associated taxes due were deposited on time and in full.
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May 15Employers – Deposit Social Security, Medicare and withheld income taxes for April if the monthly deposit rule applies.
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May 15Employers – Deposit nonpayroll withheld income tax for April if the monthly deposit rule applies.
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May 15Calendar-year exempt organizations – File a 2025 information return (Form 990, Form 990-EZ or Form 990-PF) or file for an automatic six-month extension (Form 8868). Pay any tax due.
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May 15Calendar-year small exempt organizations (with gross receipts normally of $50,000 or less) – File a 2025 e-Postcard (Form 990-N) if not filing Form 990 or Form 990-EZ.
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 June 2026

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June 10Individuals – Report May tip income of $20 or more to employers (Form 4070).
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June 15Employers – Deposit Social Security, Medicare and withheld income taxes for May if the monthly deposit rule applies.
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June 15Employers – Deposit nonpayroll withheld income tax for May if the monthly deposit rule applies.
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June 15Calendar-year corporations – Pay the second installment of 2026 estimated income taxes, completing Form 1120-W for the corporation’s records.
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June 15Individuals – Pay the second installment of 2026 estimated taxes (Form 1040-ES) if not paying income tax through withholding or not paying sufficient income tax through withholding.
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June 15Individuals – File a 2025 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.
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 July 2026

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July 10Individuals – Report June tip income of $20 or more to employers (Form 4070).
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July 15Employers – Deposit Social Security, Medicare and withheld income taxes for June if the monthly deposit rule applies.
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July 15Employers – Deposit nonpayroll withheld income tax for June if the monthly deposit rule applies.
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July 31Employers – Report Social Security and Medicare taxes and income tax withholding for second quarter 2026 (Form 941) and pay any tax due if all of the associated taxes due weren’t deposited on time and in full.
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July 31Employers – File a 2025 calendar-year retirement plan report (Form 5500 or Form 5500-EZ) or request an extension.
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 August 2026

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August 10Employers – Report Social Security and Medicare taxes and income tax withholding for second quarter 2026 (Form 941), if all associated taxes due were deposited on time and in full.
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August 10Individuals – Report July tip income of $20 or more to employers (Form 4070).
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August 17Employers – Deposit Social Security, Medicare and withheld income taxes for July if the monthly deposit rule applies.
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August 17Employers – Deposit nonpayroll withheld income tax for July if the monthly deposit rule applies.
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 September 2026

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September 10Individuals – Report August tip income of $20 or more to employers (Form 4070).
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September 15Individuals – Pay the third installment of 2026 estimated taxes (Form 1040-ES), if not paying income tax through withholding or not paying sufficient income tax through withholding.
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September 15Calendar-year corporations – Pay the third installment of 2026 estimated income taxes, completing Form 1120-W for the corporation’s records.
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September 15Calendar-year S corporations – File a 2025 income tax return (Form 1120-S) and provide each shareholder with a copy of Schedule K-1 (Form 1120S) or a substitute Schedule K-1 if an automatic six-month extension was filed. Pay any tax, interest and penalties due.
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September 15Calendar-year S corporations – Make contributions for 2025 to certain employer-sponsored retirement plans if an automatic six-month extension was filed.
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September 15Calendar-year partnerships – File a 2025 income tax return (Form 1065 or Form 1065-B) and provide each partner with a copy of Schedule K1 (Form 1065) or a substitute Schedule K1 if an automatic six-month extension was filed.
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September 15Employers – Deposit Social Security, Medicare and withheld income taxes for August if the monthly deposit rule applies.
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September 15Employers – Deposit nonpayroll withheld income tax for August if the monthly deposit rule applies.
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September 30Calendar-year trusts and estates – File a 2025 income tax return (Form 1041) if an automatic five-and-a-half-month extension was filed. Pay any tax, interest and penalties due.
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 October 2026

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October 13Individuals – Report September tip income of $20 or more to employers (Form 4070).
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October 15Calendar-year bankruptcy estates – File a 2025 income tax return (Form 1041) if an automatic six-month extension was filed. Pay any tax, interest and penalties due.
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October 15Individuals – File a 2025 income tax return (Form 1040 or Form 1040-SR) if an automatic six-month extension was filed (or if an automatic four-month extension was filed by a taxpayer living outside the United States and Puerto Rico). Pay any tax, interest and penalties due.
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October 15Individuals – Make contributions for 2025 to certain existing retirement plans or establish and contribute to a SEP for 2025 if an automatic six-month extension was filed.
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October 15Individuals – File a 2025 gift tax return (Form 709) and pay any tax, interest and penalties due if an automatic six-month extension was filed.
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October 15Calendar-year C corporations – File a 2025 income tax return (Form 1120) if an automatic six-month extension was filed. Pay any tax, interest and penalties due.
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October 15Calendar-year C corporations – Make contributions for 2025 to certain employer-sponsored retirement plans if an automatic six-month extension was filed.
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October 15Employers – Deposit Social Security, Medicare and withheld income taxes for September if the monthly deposit rule applies.
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October 15Employers – Deposit nonpayroll withheld income tax for September if the monthly deposit rule applies.
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 November 2026

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November 2Employers – Report Social Security and Medicare taxes and income tax withholding for third quarter 2026 (Form 941) and pay any tax due if all of the associated taxes due weren’t deposited on time and in full.
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November 10Employers – Report Social Security and Medicare taxes and income tax withholding for third quarter 2026 (Form 941) if all of the associated taxes due were deposited on time and in full.
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November 10Individuals – Report October tip income of $20 or more to employers (Form 4070).
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November 16Employers – Deposit Social Security, Medicare and withheld income taxes for October if the monthly deposit rule applies.
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November 16Employers – Deposit nonpayroll withheld income tax for October if the monthly deposit rule applies.
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November 16Calendar-year exempt organizations – File a 2025 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.
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 December 2026

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December 10Individuals – Report November tip income of $20 or more to employers (Form 4070).
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December 15Calendar-year corporations – Pay the fourth installment of 2026 estimated income taxes, completing Form 1120-W for the corporation’s records.
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December 15Employers – Deposit Social Security, Medicare and withheld income taxes for November if the monthly deposit rule applies.
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December 15Employers – Deposit nonpayroll withheld income tax for November if the monthly deposit rule applies.