08/18/2026
If your S corporation or partnership filed an extension for the 2025 tax year, the final deadline to submit your return is **September 15, 2026**.
A few key reminders as the deadline approaches:
š¹ **Extensions only delay the filingāNOT the payment.** Any unpaid tax may already be accruing interest and penalties.
š¹ **There are no additional extensions.** September 15th is the absolute final day to file your extended S corporation or partnership return.
š¹ **Review everything carefully.** Overlooked deductions or incorrect income reporting can slow down processing and may require corrections later.
If you have questions or need assistance preparing your return before the deadline, our team at Kilgore, Brown & Brittain, LLC is here to help.