Introduction: What a Follower Notice Means for an American in Britain
A follower notice tells you that somebody else lost your argument in court. Moreover, it tells you that HMRC expects you to surrender, and that refusing will cost thirty per cent of the tax in dispute. British commentary treats this as a domestic enforcement problem. For an American taxpayer in London it is also a foreign tax credit problem, and that second half is where the larger sum usually disappears.
At TaxYork we act for partners, founders and senior bankers who receive a follower notice years after entering an arrangement. Typically, they have watched an enquiry grind on for most of a decade. Consequently, they now face a ninety-day decision with consequences on two continents. This guide sets out the statutory machinery, the current penalty percentages and the case law that has defeated HMRC. Additionally, it explains the American mechanics that decide whether you recover the tax you eventually pay.
What a Follower Notice Actually Is
A follower notice is a formal demand that you give up a claimed tax advantage. It arrives because a court or tribunal has already rejected the same planning in another taxpayer's case. HMRC issues it under Part 4 of the Finance Act 2014. In effect, Parliament decided that litigating a point already settled should carry a price.
Importantly, the notice does not assess tax and does not end your enquiry. Instead, it presents a choice. You either take corrective action and concede, or you carry on and accept exposure to a penalty if you ultimately lose.
Who Receives a Follower Notice
HMRC sends these notices to people whose returns rely on arrangements that mirror something already defeated in litigation, a policy it explains in its introduction to tax avoidance. Therefore, recipients are usually wealthy, professionally advised, and several years into a compliance check. Partnership planning, remuneration arrangements and film or property structures dominate the population.
Among our client base, a follower notice typically lands on a dual filer with substantial UK partnership or employment income. Moreover, that person has been claiming foreign tax credits on a US return throughout the dispute, which is precisely why the timing rules bite so hard.
How HMRC Issues a Follower Notice Under the Finance Act 2014
The statutory conditions are strict, so the first task on receipt is to test the notice against the legislation rather than assume it stands. Furthermore, HMRC has lost several of these challenges outright, which tells you the exercise is worth doing properly.
Conditions A and B in Section 204
Section 204 of the Finance Act 2014 imposes four conditions, and every one must be satisfied. Condition A requires an open tax enquiry into your return or claim. An undetermined appeal will also do. Condition B then requires that the return, claim or appeal asserts a tax advantage arising from particular arrangements.
Accordingly, a closed year is beyond reach. If HMRC has already issued a closure notice and no appeal is live, a follower notice cannot validly be given for that year at all.
Condition C: The Relevant Judicial Ruling
Condition C carries the weight. HMRC must be of the opinion that a judicial ruling is relevant to your arrangements. In other words, the reasoning in that ruling would deny the advantage you have claimed. In addition, the ruling must be final, so either the Supreme Court has spoken or the time for further appeal has expired.
The word "relevant" has produced most of the litigation about a follower notice. Notably, a decision about a different structure, or about a different statutory question, will not do simply because it concerns avoidance in general terms.
Condition D and the Twelve-Month Time Limit
Condition D prevents HMRC giving you a second notice for the same advantage, arrangements, ruling and period. Meanwhile, the timing rule sits in the same section. HMRC has twelve months to act. That period begins with the later of the ruling date and the day it received your return, claim or appeal.
As a result, late notices are vulnerable. We check the chronology on every follower notice we review, because the department does occasionally miss its own window on older enquiries.
Corrective Action and the Ninety-Day Decision
Once a follower notice survives that review, the clock governs everything. Furthermore, the two deadlines run in parallel and are easy to confuse, so calendar them separately on the day the notice arrives.
What Corrective Action Means in Practice
Corrective action under section 208 means amending your return to give up the advantage. Alternatively, where the matter sits in an appeal, it means agreeing in writing with HMRC to relinquish it. Subsequently, you must tell HMRC that you have done so and quantify the additional tax.
Taking corrective action removes the penalty entirely. However, it also concedes the underlying dispute, so the decision deserves a proper legal opinion rather than a reflex.
The Specified Time and the Thirty-Day Extension
The specified time is ninety days from the date the notice was given. Nevertheless, representations change that. If you make them and HMRC confirms the notice, you get the later of the ninety-day period and thirty days from the date HMRC notifies its determination.
That extension matters. In practice, sensible representations therefore buy both a chance of withdrawal and a short additional period to settle the American side of the analysis.
Representations Under Section 207
Section 207 allows written representations within ninety days. However, the permitted grounds are narrow. You may argue that Condition A, B or D was not met. Alternatively, you may argue that the ruling is not relevant to your arrangements, or that HMRC gave the notice out of time.
HMRC must then confirm, amend or withdraw the follower notice. Importantly, an officer unconnected with the enquiry reviews the representations, so a precise, evidenced submission has a genuine prospect of success.
The Penalty Regime: Thirty Per Cent, Not Fifty
Most online guidance still quotes fifty per cent. That figure is out of date, and repeating it to a client overstates the exposure by two thirds.
Section 209 and the Ten Per Cent Floor
Section 209 sets the penalty for failing to take corrective action. It is thirty per cent of the value of the denied advantage. Finance Act 2021 reduced it from fifty per cent with effect from 10 June 2021. Consequently, any page quoting the older rate predates the change.
Section 210 then allows HMRC to reduce the follower notice percentage for co-operation, though never below ten per cent. Co-operation includes helping to quantify the advantage, providing information and giving access to records. HMRC confirms the same mechanics in its factsheet on penalties for follower notices.
The Extra Twenty Per Cent Under Section 208A
Finance Act 2021 gave with one hand and took with the other. Section 208A adds a further penalty of up to twenty per cent. It applies where a tribunal or court finds that you acted unreasonably in bringing or conducting the proceedings, or where your case is struck out.
Therefore the theoretical maximum remains fifty per cent, but it now arrives in two parts with different triggers. In our experience, the twenty per cent charge is the one advisers overlook when modelling the downside of fighting on after a follower notice.
Appealing the Penalty When You Cannot Appeal the Notice
You cannot appeal a follower notice to the First-tier Tribunal. You can, however, appeal the penalty under section 214 within thirty days of assessment. Notably, those grounds are wider than the representations grounds.
Crucially, one ground is that it was reasonable in all the circumstances for you not to take corrective action. That is the safety valve. HMRC explains the process in its follower notices factsheet CC/FS25a, and the general appeal framework sits on the GOV.UK guide to appealable tax decisions.
Case Law That Has Defeated HMRC
Judicial review is the route to attack the notice itself, and it has worked. Accordingly, the authorities below should frame any serious challenge.
Haworth and the Reasonable Person Test
In R (Haworth) v HMRC the Supreme Court quashed a follower notice in 2021. The court held that HMRC may not issue a notice merely because it thinks the earlier ruling might, or probably would, deny the advantage.
Instead, HMRC must form the opinion that there is no scope for a reasonable person to disagree that the ruling denies it. That is a demanding standard, and it remains the single most useful authority for a recipient.
Locke, Beadle and the Limits of Late Challenges
The Court of Appeal quashed a notice in R (Locke) v HMRC in 2019 because the ruling relied upon decided a different question about different arrangements. Similarly, relevance rather than resemblance is the test.
By contrast, Beadle v HMRC in 2020 closed a door. You cannot challenge the validity of the notice collaterally in a penalty appeal. Moreover, a belief that the notice was invalid is not itself a reasonable excuse. Hence the challenge must be brought properly and promptly, by judicial review, within the usual three-month limit.
The American Collision: What a Follower Notice Does to Your Form 1116
Here is the half of a follower notice that the British market ignores entirely. Furthermore, it is where our clients recover, or permanently lose, six-figure sums.
Why the Penalty Earns No Foreign Tax Credit
The thirty per cent charge is a penalty, not an income tax. Under the American regulations a penalty is not a creditable amount, so it never reaches Form 1116. Consequently, a penalty of £162,000 is dead money on both sides of the Atlantic.
The underlying tax is different. That amount is a creditable United Kingdom income tax once it is finally determined. The IRS guidance on the foreign tax credit sets out the general conditions. Interest charged by HMRC is likewise not creditable.
Contested Tax Stays Frozen Until the Dispute Ends
While you fight a follower notice, the liability is contested. Under the regulations at 26 CFR 1.905-1, a contested foreign tax is not treated as paid for credit purposes until the contest resolves. Crucially, that remains true even where you have already remitted the money under an accelerated payment notice.
There is an escape. A cash-basis taxpayer may elect a provisional credit in the year of remittance. That election needs an agreement filed with the Form 1116, plus an annual notice for every later year until resolution. We explain that mechanism in detail in our guide to the accelerated payment notice and the US tax credit trap.
Corrective Action Unfreezes the Credit
Taking corrective action ends the contest. Therefore the tax becomes finally determined, and the American credit becomes available. This is the single most important point in the whole analysis, and it frequently changes the commercial answer.
Put plainly, conceding to a follower notice can be cheaper than winning slowly. You avoid the thirty per cent charge. Furthermore, you stop interest running at the current late payment rate published in the HMRC interest rates table. Above all, you unlock a credit that may recover most of the United Kingdom tax against American liabilities you have already paid.
The Ten-Year Window and Section 905(c)
Recovery from a follower notice settlement runs through an amended return. The Internal Revenue Code gives a special ten-year period for claims attributable to foreign taxes, which is far longer than the ordinary three-year rule. Accordingly, years you assume are closed are often still open for credit purposes.
Which year you amend depends on your method. A taxpayer who has elected the accrual method relates the resolved liability back to the United Kingdom year it concerns. In most cases, that is the year your American return already taxed the same income. By contrast, a cash-basis claimant credits the tax in the year of remittance and frequently generates excess credit, which then carries back one year and forward ten. Furthermore, any later HMRC repayment is a redetermination that must be reported.
National Insurance Never Qualifies
A follower notice settlement frequently sweeps National Insurance contributions into a single figure. Nevertheless, contributions are social security charges covered by the totalisation agreement, so they are never creditable against American income tax.
Therefore insist that the settlement schedule separates income tax, contributions, interest and penalty. Otherwise your accountant cannot substantiate the creditable portion, and the Internal Revenue Service will disallow the lot on examination.
Follower Notices, Accelerated Payments and the 2026 Enforcement Landscape
A follower notice rarely travels alone. Understanding the sequence helps you budget, because the cash demand usually arrives before the penalty decision does.
Why an Accelerated Payment Notice Usually Follows
Receiving a follower notice is itself one of the triggers for an accelerated payment notice. Consequently, many clients receive both within weeks, one demanding a decision and the other demanding money within ninety days.
The arrangements also commonly carry a scheme reference number under the disclosure of tax avoidance schemes rules, which is an independent trigger for the payment demand. In addition, that same disclosure history often signals an American reporting obligation that the original promoter never mentioned.
HMRC Powers Have Widened Sharply in 2026
The enforcement backdrop has hardened. Finance Act 2026 introduced anti-avoidance information notices, with technical guidance published on 9 September 2026. These notices let HMRC compel information from people it suspects of promoting or facilitating avoidance.
Furthermore, the department can now penalise promoters directly without first winning at tribunal. A new criminal offence also addresses failure to disclose a scheme, as the ICAEW Tax Faculty has reported to members. The Chartered Institute of Taxation stakeholder updates track these developments. Accordingly, the practical chance of a quiet, indefinite standoff has fallen considerably.
The Americans Who Are Most Exposed
Two groups suffer disproportionately when a follower notice lands. First, accidental Americans and dual nationals who joined a United Kingdom arrangement without ever filing an American return. Second, company owners whose planning produced United Kingdom relief that the Internal Revenue Service never recognised in the first place.
For the first group, the resolution of a follower notice creates real United Kingdom tax with no American return to credit it against. Those clients generally need to regularise through the IRS Streamlined Filing Compliance Procedures alongside the settlement. Our IRS Streamlined filing service handles both strands together. Unreported scheme accounts may also require catch-up FBAR and FATCA reporting.
Worked Case Study: A London Partner and a £540,000 Decision
Consider Alexandra, an American citizen and partner in a London investment firm. She entered a partnership arrangement in the 2016 to 2017 United Kingdom tax year. HMRC opened an enquiry in 2018 and the arrangement was defeated in another taxpayer's litigation in 2025. A follower notice arrived in early 2026 covering a denied advantage of £1.2 million.
The United Kingdom arithmetic is straightforward. Tax at the additional rate of forty-five per cent produces £540,000. If Alexandra fights on and loses, section 209 adds thirty per cent, or £162,000. Co-operation could reduce that to no less than ten per cent. Furthermore, section 208A offers a further twenty per cent if the tribunal considers her conduct unreasonable. Interest has meanwhile accrued for eight years.
The American arithmetic is where the decision turns. Alexandra reported the same £1.2 million on her 2017 Form 1040, because the United States never recognised the United Kingdom advantage. Consequently, she paid roughly $430,000 of federal tax on that income with almost no credit available. Therefore she has already been taxed once by Washington on income Britain is now taxing too.
Taking corrective action resolves the contest. Consequently the £540,000 becomes a finally determined United Kingdom tax. An amended 2017 return, filed within the ten-year window, can then claim credit for it against the federal tax she already paid. Her recovery is capped by the American tax attributable to that income, so the realistic figure is close to the $430,000 she paid.
Fighting on would have produced a different result entirely. She would have risked £162,000 of non-creditable penalty and watched interest compound at the current rate. Moreover, she would have pushed the American claim towards the edge of the ten-year window. That window expires ten years after the unextended due date of the 2017 return. Accordingly, we advised corrective action, a properly segregated settlement schedule, and an immediate amended return. The net saving against the fight-on scenario exceeded £480,000.
What To Do in the First Fortnight
Speed matters more than eloquence once a follower notice arrives. Furthermore, two weeks of disciplined work usually determines the outcome of the next two years.
Test the Notice Before You Answer It
Check the follower notice against each of the four conditions and the twelve-month time limit. Then read the specified judicial ruling properly and ask whether a reasonable person could disagree that it denies your advantage, applying the Haworth standard.
If the answer is yes, prepare representations under section 207 immediately. Additionally, take counsel's opinion where the sums justify it, because judicial review has a three-month clock of its own.
Model Both Outcomes on Both Sides
Build one model for corrective action and one for continued litigation. Each must show the United Kingdom tax, interest and any penalty. Furthermore, each must show the American credit recovered or forfeited, expressed in both currencies.
Most importantly, include the year-by-year credit position. A decision that looks expensive in sterling often looks cheap once the recovered American tax is included, and the reverse is equally true.
Protect the American Years Now
File protective amended returns where a year is approaching the ten-year limit. Similarly, check that any accelerated payment already made is supported by the provisional credit election and its annual notice. That election cannot be made retrospectively once the year is closed.
Our US-UK tax treaty and foreign tax credit specialists run this analysis alongside the settlement negotiation. Meanwhile, our US tax return preparation service handles the amendments themselves.
How TaxYork Can Help
We prepare and defend the cross-border position for high-net-worth Americans in Britain, and we do it in one place rather than across two disconnected firms. Consequently, the United Kingdom settlement and the American credit claim are designed together from day one.
Our work on a follower notice begins with a validity review and a two-currency model of both outcomes. We then draft the section 207 representations. Subsequently, we negotiate the settlement schedule so that tax, interest, contributions and penalty are separately stated. Finally, we prepare the amended American returns that convert the settlement into a recovered credit.
Moreover, we coordinate with your solicitors where judicial review is in contemplation, and we handle any catch-up filing the settlement exposes. Above all, we make sure the ten-year credit window is used before it closes.
Conclusion
A follower notice is not simply a demand to surrender. It is a ninety-day commercial decision with a thirty per cent downside in Britain and a far larger foreign tax credit consequence in America. Therefore treating it as a purely domestic matter is the expensive mistake.
Test the follower notice against the four conditions and the twelve-month limit. Model corrective action and continued litigation in both currencies. Finally, protect the American years before the ten-year window closes, because no amount of successful negotiation with HMRC will reopen a credit claim that has expired.
Contact Us
Speak to our cross-border team before the ninety days on your follower notice run down. You can book a consultation with a specialist who handles both the HMRC settlement and the American credit claim.
Email hello@taxyork.com or telephone 020 3488 8606. Additionally, you can review our full range of cross-border tax services before you get in touch.
Disclaimer
This article provides general information about United Kingdom and United States tax rules as at September 2026 and does not constitute professional advice. Tax legislation changes frequently, and the application of these rules depends entirely on your individual circumstances. Therefore you should obtain specific professional advice before acting on anything set out above. TaxYork accepts no liability for any loss arising from reliance on this article.