Quarterly estimated payments, 1099-NEC and W-2, S-corp and partnership returns, individual returns, and extensions. Every date checked against IRS.gov, with the source cited on every card. One click adds it to Google Calendar, or download the .ics file for Outlook, Apple Calendar, or anything else.
Final quarterly estimated tax installment for the 2025 tax year, Form 1040-ES.
Furnish Form 1099-NEC to contractors and Form W-2 to employees, and file both with the IRS/SSA, for the 2025 tax year. The statutory date is January 31, which falls on a Saturday in 2026, so it shifts to the next business day.
IRS source: General Instructions for Certain Information Returns ↗
Form 1120-S (S-corporations) and Form 1065 (partnerships) due for calendar-year filers, 2025 tax year. The statutory date is March 15, which falls on a Sunday in 2026, so it shifts to the next business day.
Form 1040 due for the 2025 tax year. The first quarterly estimated tax payment for the 2026 tax year is due the same day.
Second quarterly estimated tax installment for the 2026 tax year, Form 1040-ES.
Third quarterly estimated tax installment for the 2026 tax year is due. Also the final deadline for S-corporations and partnerships that filed a 6-month extension on their 2025 return.
Final deadline for individuals who filed a 6-month extension (Form 4868) on their 2025 Form 1040.
The IRS had not yet published its official 2027 tax calendar as of this page's last update (2026-08-09). The dates below are computed from the standard IRS due-date rules (confirmed at irs.gov/publications/p509) plus calendar weekday arithmetic, the same method the IRS itself uses. We'll re-confirm each one against the official 2027 calendar once the IRS publishes it.
Final quarterly estimated tax installment for the 2026 tax year, Form 1040-ES.
Furnish and file Form 1099-NEC and Form W-2 for the 2026 tax year. The statutory date is January 31, which falls on a Sunday in 2027, so it shifts to the next business day.
IRS source: General Instructions for Certain Information Returns ↗
Form 1120-S and Form 1065 due for calendar-year filers, 2026 tax year. March 15, 2027 is a Monday, so no weekend shift applies.
Form 1040 due for the 2026 tax year. The first quarterly estimated tax payment for the 2027 tax year is due the same day.
Second quarterly estimated tax installment for the 2027 tax year, Form 1040-ES.
Third quarterly estimated tax installment for the 2027 tax year is due. Also the final deadline for S-corporations and partnerships that filed a 6-month extension on their 2026 return.
Final deadline for individuals who filed a 6-month extension (Form 4868) on their 2026 Form 1040.
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Disclaimer. This calendar covers federal deadlines only; state tax deadlines vary and are not included. This is for educational purposes only and does not constitute legal, tax, accounting, or financial advice. Confirm every date against IRS.gov or with a licensed CPA, enrolled agent, or tax attorney before relying on it, especially the 2027 dates, which are computed from the standard rule and not yet confirmed against an official IRS 2027 calendar.