While the April 15 tax deadline has already passed, several important tax-related dates remain throughout the year. Staying aware of these deadlines can help you avoid penalties, interest, and unnecessary stress.
Below is a helpful overview of key filing dates, payment deadlines, and tax planning opportunities for the remainder of 2026. Keep in mind that this list highlights common obligations, but additional deadlines may apply depending on your specific situation.
If you need guidance or assistance meeting any of these deadlines, consider reaching out to a tax professional.
June 15 Deadline
Filing for Taxpayers Abroad
If you live outside the United States and Puerto Rico, or you are serving in the military overseas, June 15 is your deadline to:
- File your 2025 individual income tax return (Form 1040 or 1040-SR), or
- Request a four-month extension using Form 4868
Any taxes owed, including interest and penalties, must also be paid by this date.
Second Estimated Tax Payment
Taxpayers who do not have sufficient income tax withheld must submit their second estimated tax payment for 2026 using Form 1040-ES.
September 15 Deadline
Third Estimated Tax Payment
The third installment of estimated taxes for 2026 is due on September 15. This applies to individuals who:
- Do not have taxes withheld from their income, or
- Have insufficient withholding
September 30 Deadline
Trust and Estate Tax Returns
If you are a trustee or executor, this is the deadline to file a 2025 income tax return (Form 1041), provided you previously filed for an automatic extension.
All outstanding taxes, along with any applicable penalties and interest, must also be paid by this date.
October 15 Deadline
Final Deadline for Individual Tax Returns
Taxpayers who requested an automatic extension must file their 2025 individual tax return (Form 1040 or 1040-SR) by October 15.
This also applies to taxpayers living abroad or serving in the military overseas who received extended deadlines.
Retirement Contributions and SEP Setup
October 15 is also the last opportunity to:
- Contribute to certain retirement accounts for the 2025 tax year
- Establish a Simplified Employee Pension (SEP), if eligible
Gift Tax Return Filing
If you filed for an extension, you must submit your 2025 gift tax return (Form 709) by this date and pay any taxes due.
December 31 Deadline
Year-End Tax Planning Opportunities
The final day of the year presents several important tax-saving opportunities:
- Make contributions to employer-sponsored retirement plans for 2026
- Take advantage of the annual gift tax exclusion (up to $19,000 per recipient)
- Pay deductible expenses such as charitable donations, medical costs, and property taxes
Proper planning before year-end can help reduce your overall tax liability when filing your 2026 return.
Stay Ahead of Tax Deadlines
Keeping track of tax deadlines throughout the year is essential for avoiding penalties and maximizing financial efficiency. Since every taxpayer’s situation is unique, it’s wise to review your obligations regularly and seek professional advice when needed.