Form 843: How to Fill Out the Penalty Abatement Form

Form 843 is the standard IRS vehicle for asking that an assessed penalty be removed or refunded. It is not a tax return and it does not report income — it is a written request that says, in effect, “the IRS charged me a penalty, and here is why it should be removed.” Foreign-owned LLC owners reach for it most often after receiving a $25,000 Form 5472 penalty under IRC §6038A(d).

A critical caveat up front: completing Form 843 is a legal advocacy task. Whether your facts amount to “reasonable cause” is a judgment call that credentialed professionals — enrolled agents, CPAs, or attorneys — are licensed to make. This article explains the mechanics of the form so you understand the process; it is not a substitute for representation. For background on the penalty itself, see the Form 5472 penalty abatement page.

Each line is short, but two of them — line 4 and line 7 — carry the entire weight of the request. Get the Internal Revenue Code section wrong, or leave the reasonable-cause statement thin, and the IRS will deny the claim. Here is what each line asks for.

Line 7 is usually too small for a full explanation, so most filers write “See attached statement” and append a signed narrative. Read the IRS penalty abatement guide for what a reasonable-cause statement should contain.

Line 4 of Form 843 asks for the “Internal Revenue Code section.” This is the legal hook the IRS uses to match your request to the right penalty file. For a missed Form 5472, the governing section is §6038A. The penalty subsection is §6038A(d)(1) for the initial $25,000, and §6038A(d)(2) for the additional $25,000 that accrues every 30 days after a 90-day notice.

Note one important limit: there is no statute of limitations on an unfiled Form 5472 under §6501(c)(8), so a year missed long ago can still be assessed and still requires Form 843 to contest. See the penalty relief programs post for which relief routes pair with Form 843.

The IRS removes a penalty for “reasonable cause” when you can show you exercised ordinary business care and prudence but still could not comply. Vague claims fail. The strongest statements name dates, describe the specific event (serious illness, a reliance on a professional who erred, a genuine inability to obtain records), and explain how you corrected the failure as soon as you discovered it.

What a reasonable-cause statement should include

Because evaluating whether your facts clear the reasonable-cause bar is a legal judgment, this is the point where most foreign owners engage a credentialed EA, CPA, or attorney. form5472.tax does not provide that representation — our service is preparing and filing the Form 5472 itself.

This is the most expensive misunderstanding in the entire process. The $25,000 Form 5472 penalty is not a one-time charge for the most serious cases. Once the IRS issues a notice and 90 days pass without the form being filed, an additional $25,000 is added for each 30-day period the failure continues — with no cap. Submitting Form 843 does nothing to interrupt that accrual.

The correct sequence is: (1) prepare and file the delinquent Form 5472 with its pro forma Form 1120 immediately, by mail or fax; (2) then file Form 843 to request abatement of the penalty already assessed. A foreign-owned disregarded entity cannot e-file — the late return must be mailed to P.O. Box 149342, Austin, TX 78714-9342, or faxed to 855-887-7737, the only two accepted methods.

Form 843 does not have a single universal address. The IRS instructs you to send it to the service center where you would be required to file a current-year return, or — when the penalty was assessed by a notice — to the address shown on that notice. For foreign-owned LLCs, the underlying Form 5472 is filed in Austin, so the penalty notice and the Form 843 response typically route through the Austin campus.

Mail it certified with return receipt so you have proof of the date the IRS received your request. Keep a copy of the entire package — the Form 843, the attached reasonable-cause statement, and any supporting documents. For the broader filing mechanics that triggered the penalty, the voluntary disclosure guide explains when a disclosure program is a better fit than a standalone Form 843.

After you mail Form 843, expect a wait. Routine reasonable-cause cases are often decided in 3 to 6 months, but cases involving large penalties or detailed records can take a year or more. If the IRS denies the request, you generally have appeal rights, and in some situations a refund suit, but those are advocacy steps that call for a credentialed representative.

Mind the deadlines. A refund or abatement claim on Form 843 generally must be filed within 3 years of filing the return or 2 years of paying the penalty, whichever is later. Because the underlying Form 5472 obligation has no statute of limitations, the cleanest path is always to file the form on time. Our flat-fee service exists to keep you out of the penalty system entirely.

Form 843 is a remedy for a problem that is almost always preventable. The disregarded-entity-as-corporation rule has applied since 2017 under T.D. 9796, and because funding an LLC is itself a reportable transaction, virtually every foreign-owned single-member LLC has a reportable transaction — so almost all of them must file. The deadline is April 15, extendable to October 15 with a timely Form 7004.

One common point of confusion: Form 5472 is separate from beneficial-ownership reporting. Under FinCEN’s March 2025 interim final rule, US-formed entities — including foreign-owned US LLCs — are exempt from BOI reporting; only foreign reporting companies file. Form 5472 is unaffected and still required. If you want it handled, you can apply to file for a flat $299— far below form5472.online’s $547 or doola’s $1,999/year.