If the April 15 deadline passed and you still have not filed Form 5472 for your foreign-owned US LLC, you are not alone and you are not out of options. The short version is this: file now, include a reasonable cause statement, and the IRS very often removes the $25,000 penalty. It does not matter if the year you are filing for is 2024, 2021, or 2019. You can catch up on every missed year in a single coordinated submission.

This guide walks through what actually happens after the deadline passes, what the IRS wants in a late filing package, and how to structure a reasonable cause statement that holds up. Every major claim links to the primary source: the Internal Revenue Code, the Internal Revenue Manual, or the IRS's own instructions.

TL;DR

  • The statutory penalty for a late or missing Form 5472 is $25,000 per form, per year under IRC §6038A(d).
  • The penalty is not automatic in the sense you might assume. It is assessable, and reasonable cause relief under IRC §6724 can remove it when the taxpayer files late on their own initiative with a proper statement.
  • You can file Form 5472 for any prior year. The IRS accepts current revision forms for most prior years per IRM 4.4.9.4.6, and Form 1120 has year-specific templates for each tax year.
  • Filing voluntarily, before the IRS contacts you, is always treated more favorably than responding to an IRS notice.
  • No, this is not a criminal matter. Form 5472 penalties are civil, not criminal, unless there is willful fraud.

What the IRS Does When You Miss the Deadline

Nothing happens immediately. The IRS does not send a penalty notice the moment April 15 passes. What actually happens depends on whether you file voluntarily in the months that follow or whether the IRS identifies the missing return first.

The mechanics are governed by IRC §6038A(d), which sets a statutory penalty of $25,000 for each failure to file a substantially complete Form 5472. If the failure continues for more than 90 days after the IRS mails a notice about it, an additional $25,000 applies for each 30-day period (or fraction thereof) the failure continues. The continuation penalty has no statutory cap.

In practice, most taxpayers who file voluntarily before the IRS contacts them get their penalties abated when they include a credible reasonable cause statement. The procedure and standards for abatement are described in IRM 20.1.1.3.2. The IRS evaluates whether you exercised ordinary business care and prudence and whether the failure was due to circumstances beyond your control.

The Good News: You Can Catch Up on Any Year

You can submit Form 5472 for any prior tax year. There is no statute of limitations on filing an information return late. In fact, the statute of limitations on assessment for a given year does not start running until the return is filed. That is why the IRS and most tax professionals recommend catching up rather than leaving prior years open indefinitely.

For the mechanics, the IRS generally accepts the current revision of Form 5472 for prior year filings, per IRM 4.4.9.4.6. Form 5472 Rev. December 2023 is appropriate for tax years 2019 through 2025. Form 1120, however, is different. It has year-specific formatting (the tax year header and line numbers can shift year to year), so for each catch-up year you should use the Form 1120 revision that matches that tax year.

For example, if you are filing catch-up returns for 2022 and 2023, you need:

  • Form 1120 (2022 revision) + Form 5472 Rev. Dec 2023 for the 2022 tax year
  • Form 1120 (2023 revision) + Form 5472 Rev. Dec 2023 for the 2023 tax year

Each year is a separate submission. You cannot combine two years into a single Form 5472 or a single Form 1120.

Delinquent International Information Return Submission Procedures (DIIRSP)

The IRS has a formal pathway for taxpayers who missed deadlines on international information returns like Form 5472. It is called the Delinquent International Information Return Submission Procedures (DIIRSP). The current program page is on the IRS website.

Under DIIRSP, a taxpayer who has not been contacted by the IRS about the missing return can submit it together with a statement explaining why the return was late. The IRS has updated the program several times, most recently narrowing the automatic relief that used to accompany delinquent returns. Today, reasonable cause is evaluated on a case-by-case basis, but filing under DIIRSP is still the recommended path because it puts you on record as compliant and voluntarily disclosed.

The key eligibility rule is simple: if you have received a notice from the IRS about the missing return, you are no longer eligible for DIIRSP. You would instead need to respond to the notice directly, which is still possible but significantly less favorable.

What Belongs in a Complete Late Filing Package

A complete package for a late Form 5472 filing, whether for one year or several years, includes the following elements per the Form 5472 instructions and Reg §1.6038A-2:

  1. Reasonable cause statement. A dated, signed letter explaining why the return is being filed late. More on what this should contain below.
  2. Pro forma Form 1120. Required under Reg §1.6038A-1(c)(1) for foreign-owned disregarded entities. Mark the top margin with "Foreign-owned U.S. DE" per the Form 5472 instructions.
  3. Form 5472 itself. One Form 5472 per 25% foreign shareholder. For a single-member foreign-owned LLC, that is typically one form.
  4. Part V attachments. A separate sheet describing any non-monetary or less-than-full-consideration transactions, as required by the form instructions.
  5. Cover letter (optional but recommended). Names the entity, the tax year, and notes that this is a delinquent filing under DIIRSP.

The package is submitted by mail or fax. The IRS has not added Form 5472 to the Modernized e-File (MeF) system as of 2026, which is why the submission channel is paper or fax. The IRS fax number for pro forma Form 1120 and Form 5472 is 855-887-7737, published on the IRS instructions page. For mail, the address depends on the entity's principal business location and is listed in the Form 1120 instructions.

How to Write a Reasonable Cause Statement That Actually Works

The reasonable cause statement is the most important piece of a late filing. A weak statement usually gets the penalty upheld. A strong one usually gets the penalty abated. The standards the IRS applies are set out in IRM 20.1.1.3.2.

A strong statement does four things:

  1. States the facts in chronological order. When did the entity form, when did the owner learn about the filing obligation, what steps were taken and when.
  2. Explains what prevented timely filing. Not a vague "I was busy" but a specific circumstance: "My formation agent told me no federal filings were required for a single-member foreign-owned LLC with no US-source income. I only learned about Form 5472 in March 2026 when a fellow LLC owner in a founder community mentioned it."
  3. Shows ordinary business care and prudence. What would a reasonable person in the same situation have done. Relying on a formation service or accountant who failed to flag the requirement, combined with acting promptly once informed, is often accepted.
  4. Documents what you did once you learned. "Within two weeks of learning, I reconstructed transactions from bank statements and prepared Forms 5472 and 1120 for tax years 2021, 2022, 2023, and 2024."

What does not work: generic statements like "I did not know I had to file" without context, blaming the complexity of the tax code, or citing a lack of time. The IRS has specifically addressed these in IRM 20.1.1.3.2.2.

Can You Go to Jail for Not Filing Form 5472?

No. Form 5472 penalties under IRC §6038A(d) are civil monetary penalties, not criminal. Criminal penalties under IRC §7201 (tax evasion) or §7206 (fraud) require willful intent to defraud the government, which is a very different standard and almost never applies to foreign LLC owners who simply did not know the form existed.

This is a common source of anxiety for first-time founders who search the penalty online. The number ($25,000) is large enough to cause panic. The reality is that this is a reporting penalty, it is civil, it is commonly abated for first-time filers with reasonable cause, and it is not a situation that escalates to criminal exposure under normal circumstances.

What If the IRS Already Sent You a Notice

If you have received a notice from the IRS about a missing Form 5472, the path is different. You are no longer eligible for DIIRSP, but you still have options:

  1. Respond to the notice by its deadline. Usually 30 days. Failing to respond allows the penalty to become final and collection activity to begin.
  2. Request First-Time Abatement (FTA) under IRS FTA administrative waiver, if you have a clean compliance history for the three preceding years.
  3. Request reasonable cause abatement. Same standard as DIIRSP but applied after the fact. The written response should include the same four elements described above.
  4. Consider getting representation. An enrolled agent or tax attorney can help if the amounts are large or if there are multiple years involved.

Frequently Asked Questions

Do I need to file Form 5472 if my LLC had zero transactions?

Probably yes. Under Reg §1.6038A-2(b)(3), reportable transactions include capital contributions and distributions between the LLC and its foreign owner. If you deposited any money into your LLC's bank account, that is a capital contribution. If you paid any LLC expense from your personal funds, that can also be a reportable transaction. Very few LLCs have truly zero reportable activity.

How many years back can I go?

There is no cutoff. You can file Form 5472 for any year the LLC existed and had a filing obligation. In practice, most catch-up filings cover the years since formation. Because the IRS updated Form 1120 formatting for 2025, prior year filings use the Form 1120 revision that matches each specific tax year.

Can I file all my missed years in one envelope or fax?

Each year is a separate Form 5472 and a separate pro forma Form 1120. It is acceptable and common to submit multiple years together in one package to the same IRS fax or address, but each year must have its own complete set of forms. Mixing years on a single Form 5472 is not allowed.

What if my formation service or CPA did not mention Form 5472?

This is one of the most common reasons foreign LLC owners miss the deadline. Formation services like Doola, Stripe Atlas, and ZenBusiness create the legal entity, but they are not tax preparers and most do not proactively explain federal information reporting obligations. Reliance on a professional who gave incorrect advice can support reasonable cause if you exercised due diligence and the failure was not due to willful neglect. See IRM 20.1.1.3.2.4.1 on reliance on a tax advisor.

Is there a fee to file late, beyond the potential penalty?

No. The IRS does not charge a separate filing fee. Your only costs are the penalty (if not abated) and whatever you pay a service or professional to prepare the returns.

Will filing late trigger an audit?

Filing late itself does not automatically trigger an audit. The IRS evaluates returns for audit based on a range of factors. Filing complete, accurate information with a clear reasonable cause statement is protective, not provocative.

How Filabl Handles Late Filings and Catch-Up

Filabl was built specifically for this situation. You can file the current year's return and any number of prior years (2019 onward) through the same guided process. The wizard generates:

  • A reasonable cause statement based on your circumstances
  • The correct year-specific Form 1120 for each tax year you select
  • Form 5472 Rev. Dec 2023 with the correct tax year period fields populated for each prior year
  • Part V attachments for reportable transactions that require them
  • A cover letter identifying the submission as a delinquent filing

The complete package is faxed directly to the IRS at 855-887-7737, the published IRS fax number for pro forma Form 1120 and Form 5472. You receive confirmation when the fax is delivered. If you need to go back further than 2019, contact support and we can handle earlier years case by case.

The whole process, including catch-up years, typically takes under 30 minutes. If you are reading this because you missed the April 15 deadline, the best step you can take today is to file. The longer the return sits unfiled, the larger the continuation penalty exposure becomes once a notice eventually arrives.

This article is for general information only and does not constitute legal or tax advice. For specific situations involving significant penalty exposure or multi-year non-compliance, consider consulting a qualified tax professional.