You missed Form 5472 (or 5471, or 3520) for years. Now what?
You formed a US LLC. You ran it. You never knew Form 5472 existed. Now you've found out — and the IRS penalty is $25,000 per form, per year, with no maximum cap. Three missed years equals $75,000 in exposure before any continuation penalty kicks in.
The Delinquent International Information Return Submission Procedures — DIIRSP — is the IRS pathway for exactly this situation. It lets you file the missing returns with a reasonable cause statement attached, before the IRS contacts you. Used correctly, it can result in zero penalty. Used incorrectly, it triggers the full $25,000 per form. Here's how it actually works in 2026.
What DIIRSP is — and what it isn't
DIIRSP is a filing pathway, not an amnesty program. It's still listed on IRS.gov (last reviewed April 19, 2026). It applies to taxpayers who failed to file required international information returns but who have no unreported foreign income and owe no additional US tax.
The IRS page does not list specific forms. International information returns commonly filed late include:
Critical point that has changed since 2020: penalty relief under DIIRSP is no longer automatic. Before November 2020, a clean reasonable cause statement effectively guaranteed no penalty. Today, the IRS explicitly states that penalties may still be assessed even when a reasonable cause statement is attached. The statement is now a separate request you make — the IRS reviews it on case-by-case facts.
Eligibility — the four gates you must clear
Before you mail anything, confirm all four of these are true. If even one fails, DIIRSP is the wrong pathway.
Reasonable cause — what actually works
The Internal Revenue Manual at IRM 20.1.1.3.2.1 defines reasonable cause as "any reason that establishes a taxpayer exercised ordinary business care and prudence but nevertheless failed to comply with the tax law." That standard is fact-specific. Generic statements don't move the IRS. Specific, documented facts do.
Four fact patterns that tend to support a strong reasonable cause claim:
- Reliance on a qualified professional. You hired a tax preparer with international experience, disclosed your foreign ownership in writing, and the professional did not advise you of the filing requirement. Generic 1040 preparers don't qualify the same way.
- Serious illness or family death during the filing window, with corroborating records (hospital admission dates, treatment timeline).
- Natural disaster or disruption. A FEMA-declared disaster, fire, or flood that destroyed records or made compliance impossible during the filing window.
- Prompt corrective action upon discovery. The shorter the gap between "I learned" and "I filed," the stronger this factor.
Each statement should be made under penalties of perjury (for Form 5472, Treas. Reg. 1.6038A-4(b)) and should be attached to each delinquent return separately — not one cover letter for all of them.
"My CPA said it wasn't needed": No written advice, no professional engagement letter — verbal claims fail.
"The form is confusing": Complexity is not a defense — the IRS expects you to seek qualified help.
"I was busy with my business": Routine business pressures don't establish ordinary care and prudence.
"Other things came first": Prioritizing other items over a known filing obligation is the opposite of reasonable cause.
Filing the package — exact steps
The DIIRSP filing has three components: the delinquent form itself, the reasonable cause statement, and the correct delivery method. Mistakes on any of the three can blow up the submission.
1973 Rulon White Blvd
M/S 6112, Attn: PIN Unit
Ogden, UT 84201
Or fax (300 DPI minimum): 855-887-7737
Foreign-owned US disregarded entities cannot e-file Form 5472. Mail or fax only. Write "Foreign-owned US DE" across the top of Form 1120.
The order of operations matters:
- Confirm all four eligibility gates (not under exam, not under investigation, not contacted, no unreported income).
- Inventory every year that's missing — don't file partial coverage and leave other years exposed.
- Prepare each delinquent form as it should have been filed in the original year (use the form revision in effect for that tax year).
- Draft a separate reasonable cause statement for each form, signed under penalties of perjury.
- File through normal filing procedures: attach the delinquent form to an amended income tax return and follow the amended return instructions (Forms 3520 and 3520-A follow their own form instructions). For Form 5472 of a foreign-owned US disregarded entity, follow the Form 5472 instructions: pro forma Form 1120 to the Ogden PIN Unit address or fax, not the standard Form 1120 address.
- Send by certified mail or keep the fax confirmation. You will need proof of submission if a notice arrives later.
- Save a complete copy of the package, plus a screenshot of the IRS DIIRSP page on the date you filed.
Worked example — Chen catches up three years of Form 5472
Chen is a software founder living in Singapore. He set up a Delaware C-Corp in 2022 to hold his SaaS business and paid himself service fees of $180,000 a year for development work. He filed Form 1120 every year and reported the income correctly. He never filed Form 5472. In April 2026, while preparing his 2025 return with a new tax preparer, he learns the form was required because he is a 100% foreign shareholder making reportable transactions with his own corporation.
Chen's facts:
- Years missed: 2022, 2023, 2024 (three forms)
- 2025 return: on extension — he can include 2025 Form 5472 with the timely 2025 Form 1120
- Income reporting: all C-Corp income reported on Form 1120, all US tax paid in full
- IRS contact: none — no exam, no notice, no investigation
- Eligibility: all four DIIRSP gates clear
2023 Form 5472: $25,000
2024 Form 5472: $25,000
Total initial penalty exposure: $75,000
Plus $25,000 per 30-day period after a 90-day IRS notice, with no statutory maximum.
Chen's preparer pulls the 2022, 2023, and 2024 Form 5472 revisions, completes each with the reportable transactions for the year, and drafts three separate reasonable cause statements. The statements describe that Chen relied on his original US incorporator (not a tax preparer, which is a weaker factor than reliance on a qualified tax professional) for compliance guidance, that he discovered the requirement during his 2025 preparation, and that he engaged a qualified tax professional and filed within weeks of learning of the obligation. Each statement is signed under penalties of perjury.
Because Chen's C-Corp already filed Form 1120 for each year, each Form 5472 is attached to an amended Form 1120 for that year and filed under the amended return instructions (the Ogden PIN Unit address is for foreign-owned disregarded entities, not for a C-Corp). Chen keeps proof of submission and saves a screenshot of the IRS DIIRSP page as of the filing date. Outcome: the IRS may accept the reasonable cause and assess no penalty, or may issue a CP15 penalty notice that Chen must respond to within 30 days. Either way, filing under DIIRSP before the IRS contacts him gives Chen the strongest possible position. If he had waited until a notice arrived for one of the missing years, that year would have been off the DIIRSP table entirely.
If the IRS still assesses a penalty after you file
Receiving a CP15 (or similar penalty notice) after a DIIRSP submission does not mean the case is over. It means the IRS processed the return through normal channels and the reasonable cause review hasn't kicked in yet. You have options:
- Respond to the CP15 in writing within 30 days with a copy of the reasonable cause statement and any additional supporting documentation.
- File Form 843 (Claim for Refund and Request for Abatement) if the penalty has already been assessed.
- Request an appeals conference if the IRS denies abatement at the examiner level.
The IRS's stated priority is compliance, not punishment. A clean, complete, professionally prepared submission is what makes that abatement decision easier for the reviewer.
Common mistakes
- Filing only the most recent year and hoping the IRS forgets the older years. Every missing year is a separate $25,000 exposure that doesn't go away with time — under IRC 6501(c)(8), the IRS assessment period for the related year does not close until 3 years after the required information is furnished.
- Using a generic "I didn't know" statement with no supporting facts. The reasonable cause review needs specifics: dates, names, professional engagements, what you did once you found out.
- Mailing to the wrong IRS address. A foreign-owned US disregarded entity sending Form 5472 to the standard Form 1120 address often results in the package being treated as not filed.
- One reasonable cause statement covering multiple years. The IRS expects a separate statement attached to each delinquent return.
- Filing under DIIRSP when income was also unreported. If foreign income was missed, you need Streamlined Filing Compliance Procedures or Voluntary Disclosure — not DIIRSP. Choosing the wrong lane is itself disqualifying.
Frequently asked questions
There is no published timeline. Some submissions are accepted silently with no notice. Others trigger a CP15 penalty notice that you respond to with the reasonable cause statement. Keep a complete copy of the package and the proof of mailing — you will need both if a notice arrives a year later.
A rejection at the initial review is not the end. You can submit additional documentation in response to the penalty notice, file Form 843 for formal abatement, and request an appeals conference. The strength of the original statement and supporting documentation usually determines the outcome.
Yes. Since the November 2020 modification, penalty waiver under DIIRSP is no longer automatic. The IRS explicitly says penalties may still be assessed under existing procedures even when a reasonable cause statement is attached. That said, filing under DIIRSP before the IRS contacts you remains the strongest position available — you are voluntarily compliant, you have submitted the missing information, and you have made your reasonable cause case in writing.
Given that a single missed Form 5472 is a $25,000 penalty exposure, the cost-benefit math usually favors professional preparation. The reasonable cause statement is the deciding factor — a poorly drafted self-prepared statement can convert a winnable case into an upheld penalty. Look specifically for a tax professional with international information return experience.
DIIRSP is no longer available for that specific year and form. Respond to the notice within the deadline (usually 30 days), file the delinquent return as required, attach a reasonable cause statement directly to your response, and consider Form 843 for formal abatement. The reasonable cause analysis is the same — the procedural lane is just different.
No. FBAR is a separate filing made electronically with FinCEN through the BSA E-Filing System, with an explanation of the reason for filing late; the IRS no longer publishes a separate Delinquent FBAR Submission Procedures page. If you also missed reporting foreign income on your 1040, you likely need Streamlined Filing Compliance Procedures, which combines income tax, info returns, and FBARs into one submission.
Unlike Streamlined (3 years for income tax, 6 years for FBARs), DIIRSP requires you to file every year for which an information return was required and not filed. Under IRC 6501(c)(8), the assessment period for a year with a missing Form 5472, 5471, or 8865 does not close until 3 years after the information is furnished, so every missing year stays open until you file. File all of them in one package, with a separate reasonable cause statement attached to each.
This article provides general information about US tax topics and is not a substitute for personalized advice from a qualified tax professional. Tax law changes frequently — verify current rules with a tax professional before filing or making decisions based on this content.
