October 15 can be the extended filing date for both FBAR and Form 3520, but the extension mechanisms differ. An automatic FBAR extension does not prove that a Form 3520 extension exists. Check the form, tax year, and filing evidence individually.
This article focuses on extension proof and common calendar mistakes. Our Form 3520 guide and FBAR guide explain the underlying filing requirements.
FBAR’s Extension Is Generally Automatic
For an ordinary annual FBAR, FinCEN provides an automatic extension from April 15 to October 15 without an extension request. See FinCEN’s due-date guidance. Confirm whether specific relief or special rules affect the particular filer.
Form 3520 Follows Different Extension Rules
For a U.S. individual using a calendar tax year, Form 3520 is generally due April 15. A granted income-tax return extension can extend its filing deadline, generally no later than October 15. The instructions also address qualifying taxpayers abroad and other situations. See the IRS Form 3520 filing instructions.
Do not assume Form 3520 was extended simply because the FBAR was. Establish what income-tax extension applied and retain its evidence. Form 8938, when required, is attached to the applicable income-tax return; it should also be included in a coordinated filing review.
Two Fictional Filing Calendars
Timely Income-Tax Extension
A calendar-year U.S. individual obtains a valid income-tax extension before the ordinary deadline. The person reviews the corresponding Form 3520 deadline under its instructions and separately places the FBAR deadline on the calendar.
The dates may coincide, but the supporting evidence differs: the income-tax extension for the Form 3520 review, and FinCEN’s automatic-extension rule for the ordinary FBAR.
No Income-Tax Extension
Another calendar-year U.S. individual first seeks assistance in September and did not obtain an income-tax extension. The ordinary FBAR extension does not retroactively extend Form 3520. Investigate whether Form 3520 was required, whether another rule or relief applies, and how to address a missed deadline.
A routine Form 4868 request is generally made by the regular income-tax filing deadline. See the IRS extension guidance. Do not assume an ordinary late request cures an earlier omission.
For 2025 Reports Filed in 2026
For an ordinary annual 2025 FBAR, the automatic extended date is October 15, 2026. A calendar-year individual’s 2025 Form 3520 generally had an April 15, 2026 deadline, with a qualifying income-tax extension generally reaching October 15, 2026. These examples assume ordinary rules; verify applicable special relief and the person’s facts.
Keep the reporting year separate from the filing year in your records. Label a calendar entry “2025 FBAR filed in 2026” rather than only “2026 foreign report.” That makes it easier to match the deadline to the correct statements and filing confirmations.
Proof to Gather Before Relying on an Extension
- Copy of the actual extension request or documentation of the applicable extension route.
- Electronic acceptance, mailing proof, or other supporting confirmation.
- Taxpayer name, identification details, and tax year matching the filing under review.
- Prior filing confirmations for the information return itself.
- Documents establishing eligibility for any special deadline relief.
A preparer’s statement that “everything was extended” should be matched to the actual filings. Note which forms are covered, which are filed separately, and who is responsible for each deadline under the engagement.
Frequently Asked Questions
Is the FBAR extension proof of a Form 3520 extension?
No. Review the extension basis for each report.
Does filing Form 1040 also file Form 3520?
No. Form 3520 follows its separate filing instructions.
Does an income-tax filing extension extend the time to pay?
An ordinary filing extension does not extend the ordinary time to pay income tax. Estimate payment obligations separately.
What if the Form 3520 deadline was missed?
Review the filing obligation and correction options. Our reasonable-cause records checklist explains what to gather.
Review the Actual Filing Calendar
Schedule a $500 Tax Attorney Consultation with Philip M. Falco, Attorney & CPA. Up to one hour of total attorney time includes review, analysis, preparation, and the telephone consultation combined. Preparation, filing, deadline monitoring, and ongoing representation require a separate written engagement.
General information, updated October 9, 2026. Dates depend on the reporting year, filer, applicable instructions, extensions, and special relief.