Can I take an FBAR penalty to the US Tax Court?

No. An FBAR penalty is assessed under Title 31, outside the deficiency procedures, so no statutory notice of deficiency is issued and there is no Tax Court petition right. The Internal Revenue Manual confirms the venues for challenging FBAR penalties are the United States District Courts and the Court of Federal Claims. In practice that means paying and suing for a refund, or defending a government collection suit, once the administrative appeal has gone.

Do I have to pay the FBAR penalty before I can appeal it?

Not for the administrative appeal. The IRS procedures state that payment of the proposed penalty is not required in order to appeal, so you can protest a proposed FBAR penalty to the Independent Office of Appeals without paying. Payment becomes relevant later: if you want a court to hear the case after assessment, one route is to pay the penalty and file a refund suit in a district court or the Court of Federal Claims.

I live in the UK and the response date on my notice is almost here. What should I do?

Act on the printed date, not on when the envelope arrived, because that date governs. Ask the group manager in writing for an extension of time to file the protest before the date passes, since the manual allows reasonable extensions. At the same time, put a Form 2848 power of attorney in place so US correspondence reaches a representative directly, and if you post the protest, use a trackable service and keep proof of postmark.

How far back can the IRS assess a penalty for a missed FBAR?

Under 31 USC 5321(b)(1) the IRS may assess a civil FBAR penalty at any time before the end of the six-year period beginning on the date of the transaction. For a report filing violation the date of the transaction is the FBAR due date, and for reports due for calendar year 2016 onwards examiners treat 15 April as the start date. A filer may also consent to extend that assessment period.

Can I still use the Streamlined Foreign Offshore Procedures after a penalty is assessed?

No. The IRS states that if it has initiated a civil examination of your returns for any taxable year, you are not eligible for the streamlined procedures, regardless of whether the examination relates to undisclosed foreign financial assets, and a taxpayer under IRS Criminal Investigation is also ineligible. The IRS also confirms that penalty assessments already made are not abated by later use of the procedures. Late FBARs outside an examination are filed through FinCEN's BSA E-Filing System.

Does paying UK tax on the account income protect me from an FBAR penalty?

No. The FBAR is an information report filed with FinCEN under the Bank Secrecy Act, not a tax return, so a fully compliant UK self assessment history does not answer a US reporting failure. It can help evidentially, by showing the income was never hidden. If UK income from the same accounts was also misreported to HMRC, that is a separate exposure, and HMRC's Worldwide Disclosure Facility is the usual route for correcting it.

CP15 and FBAR Penalty Notices: How to Respond

If a missed FBAR has turned into a penalty notice, the single most important thing to understand before you write a word of reply is that an FBAR civil penalty is a Title 31 penalty, not a tax deficiency. There is no 90-day letter, no statutory notice of deficiency and no United States Tax Court petition. The Internal Revenue Manual states plainly that in unagreed FBAR cases a statutory notice of deficiency is not issued, and that the venues available for challenging FBAR penalties are the United States District Courts and the Court of Federal Claims, not the United States Tax Court. You can read that at https://www.irs.gov/irm/part8/irm_08-011-006. Your practical remedy is administrative, through the IRS Independent Office of Appeals, and the window for it is short.

That is why a penalty notice landing on a kitchen table in London deserves a same-week response rather than a same-month one. In the cases we prepare, the failure mode we see most often is not a weak reasonable cause argument. It is a strong argument filed after the response date printed on the notice, by a client who assumed there would be a court petition period at the end of the process the way there is with an income tax adjustment. There is not. Miss the Appeals window on a Title 31 penalty and what remains is paying the penalty and suing for a refund, or waiting to be sued and defending. Both are litigation, and both are expensive.

The rest of this guide walks through what the notice actually is, how the appeal route works before and after assessment, the six-year assessment period, the difference between the non-willful and willful regimes, the evidence that genuinely supports reasonable cause for a UK filer, and what happens if the penalty simply goes unpaid.

Is the notice in front of you actually an FBAR penalty?

This is the first question and it is not a pedantic one. CP15 is the IRS civil penalty notice, and in cross-border cases the CP15 notices we see most often carry penalties assessed under the Internal Revenue Code for late or missing international information returns, not FBAR penalties. The FBAR penalty has its own paperwork. Before assessment, the examiner issues Letter 3709, the FBAR 30 Day Letter. After assessment, the CTR and BSA function issues Letter 3708, Notice and Demand for Payment of FBAR Penalty. Both are described in the FBAR procedures manual at https://www.irs.gov/irm/part4/irm_04-026-017r.

Why it matters: the two families of penalty have different appeal routes, different statutes of limitation, different abatement mechanics and different consequences for non-payment. A reasonable cause statement drafted for an Internal Revenue Code information return penalty, sent to the wrong function, will not stop an FBAR assessment. Spend twenty minutes identifying what you are holding before you spend twenty hours answering it.

The statute cited on the notice. A reference to 31 USC 5321(a)(5) or 31 USC 5321(a)(6) means a Title 31 FBAR penalty. References to Internal Revenue Code sections such as 6038, 6038D or 6677 mean a Title 26 information return penalty with a different route entirely.
The form referenced. FinCEN Form 114 means FBAR. Form 5471, Form 8938 or Form 3520 means the Internal Revenue Code side.
The letter or notice number. Letter 3709 is the pre-assessment FBAR 30 Day Letter. Letter 3708 is the post-assessment notice and demand for an assessed FBAR penalty. CP-series notices are Internal Revenue Code civil penalty notices.
The period described. An FBAR penalty attaches to a calendar year report, not to an adjustment to a tax return year.
The response date printed on the face of the notice. Whatever else you take from this article, that date governs everything that follows.

Why a missed FBAR penalty never reaches the Tax Court

The FBAR requirement sits in the Bank Secrecy Act, at 31 USC 5314 and the regulations at 31 CFR 1010.306, 31 CFR 1010.350 and 31 CFR 1010.420. The Secretary of the Treasury delegated civil compliance to FinCEN, which redelegated examination and penalty enforcement to the IRS. That is the whole reason the familiar machinery is absent. Deficiency procedures, and with them the 90-day petition right, belong to Title 26. A Title 31 penalty is simply determined, assessed and demanded.

So the sequence is: examination, a proposed penalty, Letter 3709 giving you a response date, and then, if you do not protest, closure of the case as unagreed, assessment of the penalty, and the start of collection. The manual is blunt about it. If there is no response to the Letter 3709 the case is closed unagreed, the penalty is assessed, and if it is not already fully paid the collection process begins. Once the penalty is assessed, it becomes a claim of the United States government.

After assessment, the manual describes two ways to challenge the penalty in court: pay the penalty and file a refund suit, or wait until the government files suit in a district court to collect and challenge the assessment in that action. Neither is a substitute for the administrative appeal, and both start from a much worse position.

What the IRS Independent Office of Appeals can still do

The Independent Office of Appeals exists to resolve disputes without litigation in a way that is fair and impartial to the government and to the taxpayer, and it has real settlement authority on FBAR cases. Its front door is at https://www.irs.gov/appeals. The mechanics for FBAR penalties, though, are unusual and worth knowing precisely.

Before assessment, you appeal by submitting a written protest to the examiner, postmarked on or before the designated response date listed in Letter 3709. A valid protest must contain all the information required by that letter, which is why reading the letter itself, rather than a general article about protests, is the correct starting point. The group manager may grant reasonable extensions of time to provide a protest, and that request has to be made before the date passes, not after. Importantly, payment of the proposed penalty is not required in order to appeal.

There is a hidden gate on the pre-assessment route. Appeals requires 365 days remaining on the assessment statute of limitations at the time it receives the administrative file. If less than that remains and you decline to extend the statute by consent, a pre-assessment hearing is not available at all, and the penalty will be assessed first. In that situation the manual directs examiners to tell you, in the Letter 3709 package, that you may request a post-assessment hearing once you receive Letter 3708, and to follow the same procedures for requesting it.

After assessment, the clock is tighter again. Appeals will not accept an assessed FBAR case if more than 180 days have elapsed since the date of assessment, except in certain circumstances approved by Appeals management. Post-assessment appeal rights are provided only where you have not already had a pre-assessment appeal, because a filer is afforded only one administrative appeal on an FBAR case, pre-assessed or post-assessed. There is also a routing constraint that quietly shortens the window: where a protest reaches CTR Operations in response to Letter 3708 and less than a year remains on the assessment statute, the file must be received by Appeals within six months after assessment, because Appeals requires 18 months remaining on the two-year statute for the government to file suit.

One further limit is worth knowing before you form expectations about settlement. Appeals may not compromise a post-assessed FBAR penalty in excess of 100,000 US dollars without approval from the Department of Justice, because once assessed the penalty is a claim of the United States government. That approval process adds months, and the manual sets its own internal deadlines around it.

How long do you actually have to respond?

The honest answer is that the date on your notice governs, and no rule of thumb replaces reading it. Letter 3709 is called the FBAR 30 Day Letter and the examiner ordinarily waits 30 days from issuance to see whether you request an appeal. But the manual also instructs examiners to set a shorter response date where insufficient time remains on the assessment statute to allow a full 30 days. So a UK-resident client can receive an FBAR 30 Day Letter that in fact allows considerably less than 30 days, and nothing on the envelope announces that.

Treat the printed response date as a postmark deadline for a protest, work backwards from it, and if the arithmetic does not work, ask the group manager in writing for an extension while the date is still live.

The six-year assessment period under 31 USC 5321(b)(1)

The period of limitation on assessing civil FBAR penalties is in 31 USC 5321(b)(1). The Secretary may assess a civil penalty at any time before the end of the six-year period beginning on the date of the transaction with respect to which the penalty is assessed. For report filing violations, the manual confirms that the date of the transaction is the due date of the FBAR, and that for reports due for calendar year 2016 and subsequent years examiners should treat 15 April as the date the statute begins to run.

Two practical consequences follow. First, a notice arriving today can reach back to reports whose due dates were nearly six years ago, which is precisely the period for which UK bank records are hardest to obtain. Second, where the remaining statute is short, the IRS has a structural incentive to assess first and offer Appeals afterwards, which is exactly the scenario in which the 180-day post-assessment window becomes the binding constraint. Filers may consent to extend the assessment statute, and in some cases agreeing to a consent is what buys the pre-assessment hearing that is otherwise unavailable. That is a judgement call, not an automatic yes, and it should be made with the whole file in view.

Non-willful and willful penalties are two different regimes

The two regimes differ in how the penalty is counted, how large it can be, and who has to prove what. On the non-willful side, the manual states that the failure to file a legally compliant FBAR constitutes a single reporting violation, so a single non-willful reporting violation can only result in a single penalty, no matter how many accounts were omitted. That per-report treatment reflects the Supreme Court decision in Bittner v. United States and is now built into the assessment paperwork. The maximum for a non-willful violation is a statutory amount adjusted annually for inflation. Do not rely on a figure quoted in an article, including this one. The adjusted maximums are published at 31 CFR 1010.821 and are updated each year, so check the current table at https://www.ecfr.gov/current/title-31/subtitle-B/chapter-X/part-1010/subpart-H/section-1010.821 before you model anything. The IRS reference guide for the FBAR, Publication 5569 at https://www.irs.gov/pub/irs-pdf/p5569.pdf, is the plain-English companion to the same rule and confirms that the civil penalty amounts are adjusted annually for inflation.

The manual also applies an internal ceiling: in no event will the total amount of the penalties for non-willful violations, among all open years, exceed 50 percent of the highest aggregate balance of all the foreign financial accounts to which the violations relate for the years under examination.

The willful regime is different in kind. Willful penalties apply on a per-account basis, and for each willful violation the penalty may be imposed up to the greater of the inflation-adjusted statutory amount or 50 percent of the amount in the account at the time of the violation. The civil test for willfulness is whether a person knowingly violated a legal duty, recklessly violated it, or acted with willful blindness by making a conscious effort to avoid learning about it. Critically, the burden of establishing willfulness is on the IRS, and a finding of willfulness must be supported by evidence. The full penalty framework is at https://www.irs.gov/irm/part4/irm_04-026-016.

Where a willful penalty is proposed, the manual also has mitigation guidelines, and qualifying for them is a threshold exercise. A filer must meet four criteria.

No history of criminal tax or Bank Secrecy Act convictions for the preceding 10 years, and no history of prior FBAR penalty assessments.
No money passing through any of the foreign accounts associated with the filer came from an illegal source or was used to further a criminal purpose.
The filer cooperated during the examination, for example the IRS did not have to resort to a summons for non-privileged information, the filer responded to reasonable requests for documents, meetings and interviews, and the filer back-filed correct reports.
The IRS did not determine a civil fraud penalty against the person for an underpayment for the year in question due to failure to report income related to an amount in a foreign account.

What reasonable cause actually looks like in a UK evidence file

For non-willful violations the manual sets a two-part condition: the penalty should not be imposed if the violation was due to reasonable cause and accurate delinquent or amended FBARs are filed, rectifying the prior violations. Both halves matter. A beautifully argued reasonable cause statement unaccompanied by actually filed reports does not meet the test.

Reasonable cause here is not a special Bank Secrecy Act concept. Courts have concluded that Title 26 reasonable cause principles can be used, and the working formulation is that a person has reasonable cause for an FBAR violation when the violation occurred despite an exercise of ordinary business care and prudence. The IRS sets out the factors it weighs, including the efforts made to report correctly, the complexity of the issue, the filer's education, experience and knowledge, the steps taken to understand the obligation, and whether reliance on an adviser was reasonable, at https://www.irs.gov/payments/penalty-relief-due-to-reasonable-cause.

In the protests we prepare for UK-resident clients, the argument almost never turns on eloquence. It turns on whether the file demonstrates a documented attempt to comply and a documented reconstruction. Here is the evidence package that carries weight.

Dated records requests to every UK bank, building society, platform and pension administrator, with the replies, including partial replies and refusals. A trail of requests and responses is far more persuasive than a narrative assertion that records were unavailable.
Where a UK institution will not produce historic statements through its ordinary channels, evidence that you used your right of access to your own personal data under UK data protection law, and the outcome. The Information Commissioner's Office explains that right at https://ico.org.uk/for-the-public/your-right-to-get-copies-of-your-data/.
Engagement letters, scoping questionnaires and correspondence with previous advisers, showing what you disclosed to them, what they asked you, and what you were told. Reliance is only reasonable where the adviser had relevant expertise and was given the necessary information.
Contemporaneous evidence of when you actually learned of the obligation: the email, the bank letter about US person status, the FATCA self-certification request, the conversation note.
The reconstruction methodology itself, written up: which statements were obtained, how peak balances were identified, which exchange rate source was used, and where a figure is an estimate, saying so on the face of the schedule rather than burying it.
Proof that accurate delinquent or amended FBARs have been filed electronically through FinCEN's BSA E-Filing System, with the BSA identifiers, because examiners must not accept paper FBARs and will verify the filing themselves.

One point deserves emphasis because it recurs. FBAR record retention rules require records to be kept for five years from the date the FBAR was due, as confirmed on the IRS FBAR page at https://www.irs.gov/businesses/small-businesses-self-employed/report-of-foreign-bank-and-financial-accounts-fbar. When the assessment period runs six years, the oldest year in a penalty case can sit beyond the period for which anyone was required to keep anything. That asymmetry is a fact to state calmly in the protest, alongside the requests you made, not a grievance to argue.

The international post squeeze that UK readers underestimate

A US notice is dated when it is generated, printed and mailed in the United States, and then crosses the Atlantic. The date printed on it starts your clock; the day you opened the envelope does not. In practice we have seen clients open an FBAR 30 Day Letter with under two weeks left, and occasionally with the date already passed, particularly where the address on file is an old one or where post is being forwarded.

The countermeasures are unglamorous and they work. Keep the IRS address of record current. Put a Form 2848 power of attorney in place with a representative who receives US correspondence, so that a copy arrives without a transatlantic delay. Where Appeals or the examiner offers a document upload or secure messaging option, use it rather than post. If you must post, post early, use a trackable service and retain proof of posting, because the protest requirement is a postmark on or before the response date. And if the arithmetic will not work, ask the group manager for an extension in writing before the date expires rather than sending a late protest and hoping.

What happens if the FBAR penalty is not paid

Non-payment does not put the matter to sleep. Under 31 USC 3717(b), interest begins to accrue on the date the notice of the penalty amount due, Letter 3708, is first mailed to the filer. Under 31 USC 3717(d), interest is not charged if the amount due is paid within thirty days of that first mailing, and the applicable rate is the Bureau of the Fiscal Service Current Value of Funds Rate entered on the letter. In addition, a delinquency penalty of not more than 6 percent a year under 31 USC 3717(e)(2) applies to amounts remaining unpaid ninety days from the date the notice was first mailed.

Beyond that, the assessed penalty is a debt owed to the United States. The government may commence a civil action to recover it within the two-year period under 31 USC 5321(b)(2), beginning on the later of the assessment date or the date any judgment becomes final in a related criminal action. The manual is explicit that there is no statute of limitations on collecting the FBAR penalty through other means, so the passing of the two-year litigation window does not extinguish the debt. Cases involving assessed FBAR penalties are administered with the Bureau of the Fiscal Service, and larger cases involve the Department of Justice.

A worked scenario: an assessed penalty reaching a London address

The following is an illustration only, with figures chosen to show the mechanics rather than to predict any outcome. Assume a US citizen who has lived in London for twenty years, holds a UK current account, a cash ISA, a stocks and shares ISA and a legacy building society account, with an illustrative combined peak of 420,000 US dollars converted at an assumed year-end rate, and who never filed FBARs because a UK-only accountant prepared the self assessment return and never asked about US citizenship.

An IRS examination opens, a non-willful penalty is proposed for several years, and Letter 3709 is issued with a response date fourteen days after the envelope reaches London. Three things now matter, in this order. First, the response date, which is met by posting a protest with proof of postmark or by asking the group manager for an extension before the date. Second, the filings, because the reasonable cause condition requires accurate delinquent FBARs to be e-filed through the BSA E-Filing System. Third, the evidence, meaning the records requests to each institution, the previous accountant's engagement letter and questionnaire showing citizenship was never asked about, and the reconstruction schedule with estimates flagged. Under the manual's own ceiling, total non-willful penalties across all open years in an illustration like this could not exceed 50 percent of the highest aggregate balance of the accounts concerned, which is a useful outer boundary when deciding how hard to fight and where.

Does the UK side of the file need attention too?

Sometimes, and it is worth checking early rather than discovering it later. The FBAR is an information report, so paying UK tax on the interest or dividends is not a defence to a US reporting penalty. But if the same accounts produced income that was never correctly reported to HMRC, there is a separate UK exposure. HMRC's route for that is the Worldwide Disclosure Facility, described at https://www.gov.uk/guidance/worldwide-disclosure-facility-make-a-disclosure. You notify through the Digital Disclosure Service, then have 90 days to gather information, calculate the liabilities including tax, interest and penalties, and submit the disclosure, with a further 90 days available for complex cases on request.

Note also what an assessed penalty closes off. The Streamlined Filing Compliance Procedures are unavailable once the IRS has initiated a civil examination of your returns for any taxable year, whether or not the examination relates to undisclosed foreign financial assets, and penalty assessments previously made are not abated by later use of the procedures. The eligibility conditions are set out at https://www.irs.gov/individuals/international-taxpayers/streamlined-filing-compliance-procedures. Late FBARs outside an examination are e-filed through FinCEN's BSA E-Filing System with a reason for late filing selected on the form; see https://www.fincen.gov/report-foreign-bank-and-financial-accounts.

The first week: what we do when a client brings us an FBAR penalty notice

Identify the notice: which statute, which form, which letter number, pre-assessment or post-assessment, and the exact response date.
Diary the response date and, separately, the 180-day post-assessment Appeals limit if the penalty has already been assessed.
Put a power of attorney in place so that US correspondence reaches a representative directly.
Confirm whether accurate delinquent or amended FBARs have actually been e-filed, and file them if not, because the reasonable cause condition depends on it.
Start the UK records requests the same week, in writing, to every institution, and keep the trail.
Decide deliberately whether to consent to extend the assessment statute in order to secure a pre-assessment hearing, rather than letting the calendar decide for you.
Draft the protest to the requirements set out in Letter 3709 itself, not to a generic template, and post it early with proof.

An FBAR penalty case is won or lost on procedure as much as on merits. The substantive law gives a non-willful filer a genuine reasonable cause defence and puts the burden of proving willfulness on the IRS. The procedural law gives you one administrative appeal, a fixed response date and no Tax Court safety net. Answer the notice inside its own window and you keep every argument you have. Miss it, and the only arguments left are the expensive ones.