October Extended Due Date Just Around the Corner

Article Highlights:

October 15, 2025, is the extended due date for 2024 federal 1040 returns.
Late-filing Penalty
Interest on Tax Due
Other October 15 deadlines

If you could not complete your 2024 tax return by April 15, 2025, and are now on extension, that extension expires on October 15, 2025. Failure to file before the extension period runs out can subject you to late-filing penalties.

There are no additional extensions (except in designated disaster areas), so if you still do not or will not have all the information needed to complete your return by the extended due date, please call this office so that we can explore your options for meeting your October 15 filing deadline.

If you are waiting for a K-1 from a partnership, S-corporation, or fiduciary (trust) return, the extended deadline for those returns is September 15 (September 30 for fiduciary returns). So, you should probably make inquiries if you have not yet received that information.

Late-filed individual federal returns are subject to a penalty of 5% of the tax due for each month, or part of a month, for which a return is not filed, up to a maximum of 25% of the tax due. If you are required to file a state return and do not do so, the state will also charge a late-file penalty. The filing extension deadline for individual returns is also October 15 for most states.

In addition, interest continues to accrue on any balance due, currently at the rate of just over .5% per month.

If this office is waiting for some missing information to complete your return, we will need that information at least a week before the October 15 due date. Please call this office immediately if you anticipate complications related to providing the needed information, so that a course of action may be determined to avoid the potential penalties.

Additional October 15, 2025, Deadlines – In addition to being the final deadline to timely file 2024 individual returns on extension, October 15 is also the deadline for the following actions:

FBAR Filings – Taxpayers with foreign financial accounts, the aggregate value of which exceeded $10,000 at any time during 2024, must file electronically with the Treasury Department a Financial Crimes Enforcement Network (FinCEN) Form 114, Report of Foreign Bank and Financial Accounts (FBAR). The original due date for the 2024 report was April 15, 2025, but individuals have been granted an automatic extension to file until October 15, 2025.
SEP-IRAs – October 15, 2025, is the deadline for a self-employed individual to set up and contribute to a SEP-IRA for 2024. The deadline for contributions to traditional and Roth IRAs for 2024 was April 15, 2025.
Special Note – Disaster Victims – If you reside in a Presidentially declared disaster area, the IRS provides additional time to file various returns, make payments and contribute to IRAs. Check this website for disaster related filing and paying postponements.

Please call this office for extended due dates of other types of filings and payments and for extended filing dates in disaster areas. Please don’t procrastinate until the last week before the due date to file your extended returns. Final note: if for whatever reason you miss the October 15 deadline, you should still file your return as soon thereafter as possible.

If you have any questions, please contact our office at (503) 224-5321. Isler Northwest LLC is a firm of business advisors and CPAs in Portland, Oregon. Our service goal at Isler Northwest is to earn our clients’ trust as their primary business and financial advisor.

Isler Northwest
(503) 224-5321
1300 SW 5th Avenue
Suite 2900
Portland, Oregon 97201