10/12/2026
October 15 Filing Extension Deadlines—Did You Know?
Taxpayers who obtained a valid extension to file their 2025 federal individual income-tax returns must file by Thursday, October 15, 2026. Calendar-year C corporations that requested an extension in a timely manner using Form 7004 generally must also file their 2025 Form 1120 by that date.
Remember that an extension provides additional time to file, not additional time to pay. Federal tax ordinarily remained due by the original April filing deadline, and interest and penalties could apply to unpaid amounts.
U.S. persons required to file a Report of Foreign Bank and Financial Accounts (FBAR) for 2025 usually must file by October 15, 2026. An FBAR may be required when the aggregate value of covered foreign financial accounts exceeded $10,000 at any time during 2025. The FBAR extension is automatic, so no extension request is required.
Idaho individual income-tax filers with valid extensions must also file their 2025 Idaho returns and pay the remaining balance by October 15, 2026. An Idaho extension provides additional time to file, not additional time to pay.
Have questions about an extended federal or Idaho return or an FBAR filing requirement? Call DWHFS at (208) 938-0701 Mon–Fri, 9 AM – 6 PM, Email [email protected], or Visit dwhfs. com .