While the April 15 tax deadline has passed, several important dates remain in 2026. Staying on top of these deadlines helps you avoid penalties and ensures you maximize tax opportunities. Here’s a streamlined calendar of key dates for individuals.
June 15
- File your 2025 individual income tax return (Form 1040 or 1040‑SR) or request a four‑month extension (Form 4868) if you live or serve outside the U.S. and Puerto Rico.
- Pay any tax, interest, and penalties due.
- Submit the second installment of 2026 estimated taxes (Form 1040‑ES) if withholding is insufficient.
September 15
- Pay the third installment of 2026 estimated taxes (Form 1040‑ES) if withholding is insufficient.
September 30
- Trustees of trusts and executors of estates must file a 2025 income tax return (Form 1041) if a five‑and‑a‑half‑month extension was filed.
- Pay any tax, interest, and penalties due.
October 15
- File your 2025 individual income tax return (Form 1040 or 1040‑SR) if you filed for a six‑month extension.
- Pay any tax, interest, and penalties due.
- Make 2025 contributions to certain retirement plans or establish a SEP if you filed for an extension.
- File a 2025 gift tax return (Form 709) if you filed for a six‑month extension.
December 31
- Make 2026 contributions to employer‑sponsored retirement plans.
- Complete 2026 annual exclusion gifts (up to $19,000 per recipient).
- Incur deductible expenses for 2026, such as charitable donations, medical costs, or property tax payments.
Conclusion This calendar highlights major tax deadlines for the remainder of 2026. Staying proactive ensures compliance and helps you take advantage of tax‑saving opportunities.