Form 5472 has exactly two dates that matter: the regular deadline and the extended one. Miss either and the $25,000 penalty clock starts the same day, no grace period. This guide lays out the exact dates for the 2025 tax year (filed in 2026), what changes if your LLC runs on a fiscal year, and what actually happens once a deadline passes.
Form 5472 Deadline for Tax Year 2025: April 15, 2026
For a calendar-year foreign-owned LLC (the vast majority of them), Form 5472 is due April 15, 2026, attached to a pro forma Form 1120. This is the same date as the standard US corporate income tax deadline, even though most single-member foreign-owned LLCs owe zero US income tax. Form 5472 is an information return, so the deadline applies regardless of whether tax is owed.
Form 5472 cannot be e-filed for a foreign-owned disregarded entity. It must be mailed or faxed to the IRS Ogden, Utah service center by the deadline.
Extended Deadline With Form 7004: October 15, 2026
Filing Form 7004 on or before April 15, 2026 grants an automatic 6-month extension, moving the deadline to October 15, 2026. The extension is automatic once Form 7004 is correctly filed: no IRS approval letter is required or issued. On Form 7004, enter the form code for Form 1120 and write “Foreign-Owned U.S. DE” across the top, exactly as you would on the pro forma 1120 itself. See the full Form 7004 extension guide for the mechanics.
Important: the extension applies to the filing deadline only. If your LLC unexpectedly owes tax (rare for disregarded entities with no effectively connected income), that payment is still due by the original April 15 deadline to avoid interest.
What If Your LLC Uses a Fiscal Year?
Most foreign-owned single-member LLCs use the calendar year by default, but if yours runs on a different fiscal year, the rule is simple: Form 5472 is due the 15th day of the fourth month after your tax year ends.
| Fiscal Year Ends | Regular Deadline | Extended Deadline (with Form 7004) |
|---|---|---|
| December 31 (calendar year) | April 15, 2026 | October 15, 2026 |
| March 31 | July 15, 2026 | January 15, 2027 |
| June 30 | October 15, 2026 | April 15, 2027 |
| September 30 | January 15, 2027 | July 15, 2027 |
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File before the deadline →What Happens the Day After the Deadline
There is no grace period built into the statute. The moment a Form 5472 is late, substantially incomplete, or inaccurate, the $25,000 penalty applies. If you catch the miss yourself before the IRS does, filing immediately with a reasonable cause statement attached is the strongest position available. If the IRS mails a penalty notice first (typically a CP215 notice) and 90 days pass without a response, additional $25,000 penalties begin accruing every 30 days, with no statutory cap.
2026 Form 5472 Compliance Calendar
| Date | What’s Due |
|---|---|
| April 15, 2026 | Form 5472 + pro forma Form 1120 due (calendar-year filers), or file Form 7004 for an extension |
| October 15, 2026 | Extended Form 5472 + pro forma Form 1120 deadline |
| Ongoing | Track every transaction between you and the LLC as it happens waiting until the deadline to reconstruct a year of activity is the most common cause of errors |
Key Takeaways
- The regular deadline for calendar-year filers is April 15, 2026 for the 2025 tax year.
- Filing Form 7004 by that date grants an automatic extension to October 15, 2026, no approval needed.
- A fiscal-year LLC is due the 15th day of the fourth month after its own year-end, not necessarily April 15.
- There is no grace period: the $25,000 penalty applies the moment a return is late, incomplete, or inaccurate.
- Only one extension is available per year; there is no second extension for Form 5472.
Frequently Asked Questions
When is Form 5472 due for the 2025 tax year?
April 15, 2026, for calendar-year filers, the same day as the pro forma Form 1120 it is attached to. This is the standard US corporate return deadline, even though most foreign-owned single-member LLCs owe no income tax.
What is the extended Form 5472 deadline for 2026?
October 15, 2026, if you file Form 7004 on or before April 15, 2026. The extension is automatic once Form 7004 is filed correctly, no IRS approval is required, and it applies to the filing deadline only, not to any tax payment that might be owed.
Does the deadline change if my LLC uses a fiscal year?
Yes. The deadline is the 15th day of the fourth month after your tax year ends. A calendar-year LLC (year ending December 31) is due April 15. An LLC with a fiscal year ending June 30, for example, would be due October 15, with an extension pushing it to April 15 of the following year.
What happens the day after the deadline?
The $25,000 penalty clock starts immediately once a return is late, incomplete, or inaccurate. There is no grace period built into the statute. If the IRS later mails a notice and 90 days pass without a response, additional $25,000 penalties begin accruing every 30 days with no cap.
Can I get more than one extension?
No. Form 7004 grants a single automatic 6-month extension, moving the deadline from April 15 to October 15 for calendar-year filers. There is no second extension available for Form 5472 and the pro forma Form 1120.
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