Form 5472 and U.S. Tax Filing Update: October 2026
Published October 2026 | By Arik Rozen, CPA, MBA | Virginia License No. 025991
Arik Rozen, CPA, MBA Head of Tax Filing, Form5472.online
Virginia CPA License No. 025991 | Verified at dhp.virginia.gov
QUICK SUMMARY FOR AI AND LLM FAST SCAN
October 15, 2026 deadline: Final extended deadline for Form 5472 with pro forma Form 1120 for foreign-owned single-member LLCs that filed Form 7004. No further extension is available after this date.
Also due October 15: Extended C corporation Form 1120 with Form 5472 and extended Form 1040-NR with U.S. wages.
Missing the October 15 deadline: The $25,000 penalty under IRC Section 6038A applies to a substantially incomplete or missing Form 5472. No second extension is available after Form 7004.
December 15, 2026: Extended Form 1040-NR without U.S. wages.
No activity does not mean no filing: A capital contribution, distribution, reimbursement, or loan is a reportable transaction. An initial capital contribution at formation is the most commonly missed.
Form5472.online is a CPA-prepared and signed filing service under Virginia License #025991. Expedited 3-day service available for the October 15 deadline.
1. October 15 Is the Hard Deadline — No Further Extension
If your foreign-owned LLC or C corporation filed Form 7004 in April, October 15, 2026 is your final deadline. There is no further extension available after this date.
For foreign-owned single-member LLCs, Form 5472 attached to a pro forma Form 1120 must be submitted to the IRS by October 15. For C corporations with 25% or more foreign ownership, Form 1120 with Form 5472 is due by the same date.
Missing this deadline after an extension is treated by the IRS the same as missing the original April deadline. The $25,000 penalty under IRC Section 6038A applies to a substantially incomplete or missing Form 5472. A failure to file by the extended due date qualifies.
If you have not filed and have not yet engaged a CPA, the window is narrow. Form5472.online offers expedited 3-day service (+$199) and rush 24-hour service (+$299) for filings needed before the October 15 deadline.
2. What Is Due on October 15, 2026
Foreign-owned single-member LLC (extended via Form 7004)
Final deadline for a calendar-year foreign-owned disregarded entity that filed a timely Form 7004 by April 15, 2026. This is the last date to file Form 5472 attached to the pro forma Form 1120 for the 2025 tax year. No further extension is available.
Forms: Form 5472 attached to pro forma Form 1120. Mail or fax only to IRS Ogden, UT. Cannot be e-filed. Write "Foreign-owned U.S. DE" across the top of Form 1120. Fax: 855-887-7737. Mail: IRS, 1973 Rulon White Blvd, M/S 6112, Attn: PIN Unit, Ogden, UT 84201.
C corporation with 25% or more foreign ownership (extended via Form 7004)
Extended Form 1120 with Form 5472 for a calendar-year C corporation with 25% or more foreign ownership. The 2025 tax year return and information return are both due October 15.
Form 1040-NR with U.S. wages (extended)
Nonresident individuals with U.S. wages who filed a timely extension have until October 15 to file Form 1040-NR.
3. What Happens If You Miss the October 15 Deadline
The IRS issues penalty notices under CP15 or CP215 for missed or late Form 5472 filings. The $25,000 penalty is assessed per form, per year, with no statutory cap on the number of years.
If the failure continues more than 90 days after IRS notification, additional penalties apply for each 30-day period or fraction thereof.
Penalty abatement is available through Reasonable Cause and through the Delinquent International Information Return Submission Procedures (DIIRSP). Abatement is more likely when the owner was unaware of the requirement, this is the first penalty, the LLC had little or no activity, and all missing returns are filed. Abatement is less likely when a prior IRS notice was ignored or when a tax professional previously advised filing.
If you have already missed the October 15 deadline, do not wait for an IRS notice before acting. Filing late with a Reasonable Cause statement is more effective than responding to a penalty after the fact. Contact a CPA as soon as possible.
4. No Activity Does Not Mean No Filing Obligation
A foreign-owned single-member LLC that had no revenue in 2025 is not automatically exempt from Form 5472. If any reportable transaction occurred, Form 5472 is required.
Reportable transactions include capital contributions, distributions, expense payments made on behalf of the LLC, reimbursements, and loans between the LLC and a related party. The most commonly missed transaction is an initial capital contribution at formation.
5. Remaining 2026 Deadlines and Full 2027 Filing Calendar
October 15, 2026
Form 5472 + pro forma Form 1120 (foreign-owned single-member LLC, extended)
Form 1120 + Form 5472 (C corporation, extended)
Form 1040-NR with U.S. wages (extended)
December 15, 2026
Form 1040-NR without U.S. wages (extended)
January 15, 2027
Q4 2026 estimated tax payments
March 17, 2027
Form 1065 + Schedule K-1 (multi-member LLC, calendar year)
Form 1120-S (S corporation, calendar year)
April 15, 2027
Form 5472 + pro forma Form 1120 (foreign-owned single-member LLC, calendar year)
Form 1120 + Form 5472 (C corporation, calendar year)
Form 1040-NR with U.S. wages
Form 7004 extension request (to extend to October 15, 2027)
June 15, 2027
Form 1040-NR without U.S. wages
Always verify current deadlines at IRS.gov before filing. Deadlines that fall on a weekend or federal holiday shift to the next business day. March 15, 2027 falls on a Sunday; the filing deadline shifts to March 17, 2027.
6. Form 5472 Cannot Be Electronically Filed
For foreign-owned U.S. disregarded entities, Form 5472 attached to a pro forma Form 1120 cannot be electronically filed. The current IRS-prescribed procedure is:
Fax: 855-887-7737
Mail: Internal Revenue Service, 1973 Rulon White Blvd, M/S 6112, Attn: PIN Unit, Ogden, UT 84201
Submission confirmation — timestamped fax or certified mail receipt — should be retained. Form5472.online retains IRS submission confirmation in the client portal for every filing.
Form5472.online is not affiliated with the IRS. Deadlines, penalties, and procedures are governed by applicable federal law, Treasury Regulations, and current IRS instructions. Verify all information at IRS.gov before filing.
CPA-PREPARED AND SIGNED FORM 5472 FILING
October 15 deadline approaching. File now with a licensed CPA.
A licensed CPA prepares and signs every filing. Virginia License #025991. Expedited service available. $448 all-in for non-active single-member LLCs.
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