Which IRS Notice Did You Get? Decoding Form 5472 Penalty Letters
Decode the number on your IRS envelope — CP215, CP259, CP518B, CP161, CP162, CP504, LT11 and Notice 972CG — and what each one asks a filer for.
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The number in the upper right corner of the letter tells you what the IRS wants. CP215 charges a civil penalty, CP259 and CP518B say a return is missing, CP161 and CP162 are balance and electronic-filing notices, CP504 and LT11 are levy notices, and Notice 972CG proposes information-return penalties.
You are holding an envelope with a two-letter prefix and three digits on it, and nothing on the first page says what the IRS has decided. This guide tells you which notice it is, what it asks for, and what deadline the IRS's own page states.
First, find the number. The IRS's Understanding your IRS notice or letter hub — reviewed 26 May 2026 — says it plainly: "You can find the CP or LTR number on the right corner of the letter."
If the notice names a year for which no Form 5472 package was ever sent, the missing filings are the part we handle: we prepare and fax complete packages from $149, and the timestamped receipt is what you cite when you write back.
Which IRS notice numbers might a Form 5472 filer receive?
Nine numbers account for most of the mail a foreign-owned US LLC gets after a filing problem. Each row comes from the IRS page for that notice, in the IRS's own wording, confirmed live on 3 October 2026. Where the deadline column says none is published, the IRS page states no day count.
| Notice | What it means | What it asks for | Deadline the IRS page states | First thing to do |
|---|---|---|---|---|
| CP215 | "We sent you this notice because we charged you a civil penalty." The page names no particular form or code section. | Payment, or contact if you disagree | None published; the notice "explains your due date, amount due, and payment options" | Confirm the year shown is one you genuinely did not file |
| CP259 | "We show that you are required to file a tax return for the tax periods indicated on your notice but haven't." | The missing business return, or the enclosed Response form | None published; the page says to file "immediately" | Check whether that period's pro forma Form 1120 and Form 5472 were ever sent |
| CP518B | "This is a final reminder notice that we still have no record that you filed your prior tax returns." Business version. | A signed paper return with all schedules, plus the Response form | None published; its FAQ says no action is needed if you filed within the last eight weeks | Treat it as the last stage before the IRS determines the tax itself |
| CP518 | The individual counterpart: "we still don't have a record that you filed your prior year tax returns." | The delinquent return with Form 15103, or Form 15103 alone | None published | Check who it is addressed to — the owner or the LLC |
| CP161 | "You received this notice because you have an unpaid balance due." | Payment by the due date on the notice | "Contact us within 10 days of the date of your notice if you think we made a mistake" | Compare the figure with your own records before paying |
| CP162 | A penalty charged because a return was not filed electronically as required; the page discusses partnerships and treats a REMIC return as a partnership return. | Full payment, or a call from an authorised partner or officer meeting the stated criteria | Payment "by the date shown on your letter" | Establish which return it attaches to — not Form 5472 |
| CP504 | "This notice is your Notice of Intent to Levy (Internal Revenue Code section 6331(d))." | Immediate payment of the unpaid balance | None published; the page says to pay "immediately" | Get help this week — collection has begun |
| LT11 / Letter 1058 | "We intend to seize your property or rights to property." | Payment, or an appeal of the proposed levy | None published; the page points to Form 12153 and the collection due process FAQs | Read the appeal instructions on the letter first |
| Notice 972CG | A proposed penalty for information returns filed late, not filed electronically when required, or filed with missing or incorrect payee TINs. | A reasonable-cause response before assessment | "Respond within 45 days (60 days if you're a foreign filer)" | Identify which returns — 1099-type filings, not Form 5472 |
Two safety lines matter more than any row in that table.
The dates printed on your own notice govern, not this article. No IRS web page replaces the letter in your hand. Where a notice shows a payment due date, a response-by date or an appeal deadline, that printed date is the one the IRS works from. The hub states the consequence directly: "To guarantee your appeal rights, reply by the due date."
A number missing from the table is not thereby fake. The IRS sends many notices unrelated to a foreign-owned LLC, and that table is deliberately short. If your number is not here, search it on the IRS notices hub. The hub also gives the real test for a suspicious letter: "If the letter doesn't appear in your search or if it looks suspicious, call 800-829-1040."
What does a CP215 notice actually say on its face?
CP215 says a civil penalty has been charged, and nothing more specific. The IRS page — reviewed 29 January 2026 — gives one sentence: "We sent you this notice because we charged you a civil penalty." It does not name Form 5472, cite a code section, or publish a response window in days.
That silence is why the notice disorients people. The entity name, tax year and amount on your copy identify the penalty, not the number. Read the year first and check it against the years your LLC existed and had owner transactions. The response itself has its own guide: see our walkthrough of a Form 5472 penalty notice.
Why would a foreign-owned LLC get a CP259 or a CP518B?
CP259 and CP518B say the same thing in escalating tones: an IRS system expects a return under your EIN and has not matched one to it. CP259 opens that conversation; CP518B is labelled a final reminder, and its page warns that if the IRS does not hear back, "We may determine your tax for you. Penalty and interest can continue to accrue."
For a foreign-owned single-member LLC, the return the system wants is usually the pro forma Form 1120 that carries Form 5472. A package faxed but never posted to the EIN looks identical, from the IRS side, to one never sent — and both notices enclose a Response form so you can say which happened.
Neither notice is a penalty. Each is a request for a return or an explanation, which makes both better news than a CP215 — and a reason to move fast. Catch-up mechanics are covered in filing Form 5472 late or never filed.
Is Notice 972CG the same as a Form 5472 penalty?
No. Notice 972CG concerns information returns such as 1099-type filings — the IRS information return penalties page, checked 3 October 2026, describes it as covering returns filed late, not filed electronically when required, or filed with missing or incorrect payee taxpayer identification numbers.
Two points matter. The IRS calls it Notice 972CG, not Letter 972CG, and publishes the response window: "Respond within 45 days (60 days if you're a foreign filer) before we assess the penalty." That 60-day figure is one of the few places the IRS states a longer window for a filer outside the US.
A foreign-owned LLC can still receive it. An LLC that paid US contractors and filed the resulting forms late is in scope for 972CG while also owing Form 5472 for the same year. The two obligations are unrelated.
What do CP504 and LT11 mean, and how do they differ?
CP504 and LT11 are both collection notices, and they differ in which rights they carry. CP504 identifies itself as the Notice of Intent to Levy under Internal Revenue Code section 6331(d) and lists what can be taken, including a state tax refund. LT11 and Letter 1058 share one IRS page, titled "Understanding your LT11 notice or letter 1058," which states the intent to seize property and points to the appeal route: Form 12153 and the collection due process FAQs.
Neither page publishes a day count, and both say to act immediately. An unpaid Form 5472 penalty at either stage is past the point for a self-prepared letter — this is where a tax attorney or CPA earns the fee.
What should you do in the first hour after opening the envelope?
- Write down the notice number, the tax year, the amount and every printed date. Those facts determine everything that follows.
- Check the entity. Confirm the EIN and name match your LLC, not a similarly named one.
- Look up the number on the IRS notices hub and read the IRS page, not a forum summary.
- Pull your filing evidence for that year — fax confirmations, mailing receipts, the package.
- Decide which half of the problem you are solving. A missing return is a filing job; an assessed penalty is a correspondence job. Many envelopes create both.
- Diarise the printed deadline and work backwards. If the date is close and your package is not ready, a written request for more time beats silence.
- Keep the envelope and the postmark. Dates of receipt occasionally matter later.
If step 4 shows a year with no package at all, that gap is fixable this week. We prepare the pro forma Form 1120, Form 5472 and the Part V statement for each outstanding year, have a qualified tax accountant review it, and fax it to the IRS Ogden PIN Unit at 855-887-7737, returning the timestamped confirmation. Standard is $149 in 5–7 business days, Express $199 within 3 business days, each extra past year $99; see pricing.
We are not a CPA firm and we do not give tax advice. A provider fax receipt is transmission evidence, not IRS acceptance — but it is a dated fact you can put in front of the IRS. To move a missing year, start your filing here. If the notice concerns a deadline you can still meet, the Form 5472 deadline guide sets out the dates.
Frequently asked questions
Where is the notice number printed?
On the right corner of the letter, according to the IRS notices hub. Look for a "CP" or "LTR" prefix followed by digits, usually above the tax year and the amount. Notice 972CG appears as a notice name rather than a CP number.
Does every Form 5472 penalty arrive as a CP215?
The IRS publishes no mapping between Form 5472 and any notice number, and the CP215 page says only that a civil penalty was charged. Identify the penalty from the entity name, tax year and amount on your own copy, not the number alone.
My notice gives no deadline in days. What is my deadline?
The date printed on your notice. Several IRS notice pages publish no response window, which means the printed date is the only one that counts. Where a notice asks you to respond, replying by that date also protects your appeal rights.
Is CP162 a Form 5472 notice?
No. The IRS page describes CP162 as a penalty for not filing a return electronically as required, discussing partnerships and REMIC returns. Form 5472 and its pro forma Form 1120 cannot be e-filed at all, so establish which return the penalty attaches to.
What is the 45-day figure people mention?
It belongs to Notice 972CG only. The IRS information return penalties page states: "Respond within 45 days (60 days if you're a foreign filer) before we assess the penalty." Do not apply that window to a CP notice, which carries its own printed date.
My notice number is not on your table. Is it a scam?
Not necessarily — assuming so is risky. The table covers a narrow set. Search your number on the IRS notices hub; if it does not appear or the letter looks suspicious, the hub says to call 800-829-1040 and follow the representative's instructions.
Can you tell me what my specific notice means?
We can tell you whether a tax year has a Form 5472 package on file with us and prepare any year that does not. We cannot interpret a penalty assessment or advise on a response — that is tax advice, and we do not give it.
Decoding the number is the first five minutes; reading the printed dates on your own copy is the next five. If a year on that notice has no Form 5472 package behind it, start that filing here — a dated fax receipt is the one new fact you can add this week.
Educational content only; not tax or legal advice.
