HMRC Revenue Correction Notice: Reject or Amend? US Filers

An HMRC revenue correction notice tells you HMRC has amended your Self Assessment return because it contains an obvious error or is missing information. You have 30 days to reject it in writing, which reinstates your original figures. If you accept it, the moved UK liability can force a US foreign tax redetermination.

For most UK taxpayers a correction notice is a nuisance. For a US-connected filer who has just brought several late UK returns up to date, it is something else entirely: a retroactive change to the UK tax that has already been claimed as a credit on one or more US returns. The UK side of the file reopens, and the US side reopens with it. At Jungle Tax we see this sequence repeatedly in cross-border catch-up work, and it is almost always the US consequence, not the UK one, that costs the money.

What is a revenue correction notice, and what can HMRC actually change?

A revenue correction is HMRC's power to amend your Self Assessment return without opening an enquiry. The statutory basis is section 9ZB of the Taxes Management Act 1970 for personal and trustee returns. HMRC's own Enquiry Manual at EM1502 describes it as the officer's ability to amend a return "within 9 months of receiving an SA or CTSA return" in order to correct it, without the formality of an enquiry notice.

The scope is deliberately narrow in principle and broader in practice. HMRC may correct obvious errors or omissions in the return, and anything else in the return that the officer has reason to believe is incorrect in the light of information available to the officer. In real files, that means:

• arithmetical errors and transposed figures;
• entries that contradict data HMRC already holds — most commonly PAYE, P60, P11D, CIS and bank interest data;
• a relief or allowance claimed twice, or claimed in a box that does not support it;
• a figure omitted where the rest of the return makes clear it should be there;
• tax calculation summary boxes that do not reconcile to the rest of the return.

What a correction is not is a mechanism for resolving matters of judgement. If the point is genuinely arguable — a valuation, an apportionment, whether an expense is wholly and exclusively incurred, whether a remittance occurred — a correction is the wrong tool. EM1502 is explicit that where the point cannot be dealt with by correction, or the correction is rejected, HMRC "can only pursue the point by means of a formal enquiry". That is the fulcrum on which the whole decision turns, and we return to it below.

The new GOV.UK rejection route

GOV.UK published dedicated guidance, Disagree with a revenue correction notice, on 13 August 2026, updated on 21 August 2026. It sets out an online rejection form and confirms several practical points that were previously buried in correspondence:

• You may only use the online form if your correction notice actually directed you to that page. Corrections issued through other channels still carry their own instructions, and those instructions govern.
• The rejection can be made by the taxpayer named in the notice, or by an authorised agent acting on their behalf. For a cross-border file this matters: your UK agent authorisation must already be in place before the 30-day window starts running, not after.
• You will need the reference number from the notice. GOV.UK notes that this may begin with CFSS, VCSO or LIVAAS, or may simply be your Unique Taxpayer Reference.
• You are asked to give a reason for the rejection where you can, and you may attach supporting evidence such as payslips, P60s, invoices or CIS deduction statements. Evidence is not mandatory, but on a catch-up file it is almost always worth supplying.
• HMRC states that it "will usually send you a response within 30 calendar days of receiving your form".

The GOV.UK page does not state the legislation and does not state the deadline for rejecting. Both come from HMRC's internal manuals, and both are dealt with in the next section. Do not assume from the 30 calendar day response service standard that you have 30 calendar days to respond — the two figures are unrelated, and confusing them is the single most common error we see on incoming files.

How long does HMRC have — and why late filers get a nasty surprise

No correction may be made more than nine months after the day on which the return was delivered. Where the correction is required in consequence of a taxpayer amendment, the nine months runs from the day that amendment was made.

Read that again with a catch-up file in mind. The nine months runs from delivery, not from the original statutory filing date. A US-connected filer who registers for Self Assessment in 2026 and submits five years of outstanding returns in a single batch has just opened a fresh nine-month correction window on every one of those years — including years that would otherwise be commercially and psychologically closed. A 2019-20 return delivered in March 2026 is correctable until December 2026, notwithstanding that its original filing date was more than five years earlier.

The enquiry window behaves the same way. Where a return is delivered after the filing date, HMRC's notice of enquiry under section 9A TMA 1970 may be given up to and including the quarter day next following the first anniversary of the day the return was delivered. The quarter days are 31 January, 30 April, 31 July and 31 October.

The amendment window does not behave the same way. A taxpayer amendment under section 9ZA runs for twelve months from the filing date — the statutory 31 January following the end of the tax year — not from delivery. For an old year filed late, that window has usually already closed before the return is even submitted. The practical consequence is stark: on a five-year catch-up you may have no right to amend the older returns at all, while HMRC retains a live right to correct them, and a live right to enquire into them.

Window	Statutory basis	Runs from	Return for 2019-20 delivered 10 March 2026
HMRC revenue correction	s.9ZB TMA 1970	Day the return was delivered	Open until approximately 10 December 2026
HMRC enquiry	s.9A TMA 1970	Quarter day after the first anniversary of delivery	Open until 30 April 2027
Taxpayer amendment	s.9ZA TMA 1970	Twelve months from the filing date (31 January 2021)	Already closed — closed 31 January 2022
Overpayment relief claim	Sch 1AB TMA 1970	Four years from the end of the tax year	Already closed for 2019-20 after 5 April 2024

If the amendment route is shut and the overpayment relief route is shut, the 30-day rejection right may be the only lever you have on that year. That is why the rejection deadline is not an administrative formality; on a catch-up file it can be the last live procedural right attaching to a five-year-old return. We deal with the four-year overpayment relief position separately in our guide on overpayment relief's four-year window, and with the closed-amendment-window problem in returns filed but foreign income omitted.

Rejecting a correction is not the same as amending the return

These are frequently conflated, including by advisers who do not routinely work catch-up files. They are different rights, with different mechanics, different deadlines and different consequences.

Rejecting means telling HMRC you do not accept the correction. HMRC's Self Assessment Manual at SAM121520 states that a taxpayer "has the right to reject our repair to an obvious error" and that "the rejection must be in writing within 30 days of the issue of the Revision Notice notifying the repair", citing section 9ZB(4) and (5) TMA 1970. It also confirms that where an agent is acting, a rejection can be accepted from the agent, and that HMRC should reinstate the taxpayer's original figure.

Three features of rejection deserve emphasis:

• It is not an appeal. There is no review, no tribunal, no requirement to establish that HMRC was wrong. A validly made rejection deprives the correction of effect. The self assessment reverts to the figures you filed.
• The clock runs from issue, not receipt. The 30 days runs from the issue of the notice. For a client living in New York or San Francisco with a UK correspondence address, or with post going to a managing agent, a meaningful slice of that window can be consumed before the notice is even seen. Digital delivery to the Personal Tax Account does not solve this if nobody is monitoring the account.
• It invites the alternative. Rejection does not end the matter. It removes the cheap route and leaves HMRC with the expensive one — a formal enquiry.

Amending means you change the return. That is a substantive act with a different time limit (twelve months from the filing date), and it can itself trigger a further correction, because a correction consequent on a taxpayer amendment gets its own fresh nine-month window running from the date of the amendment.

Route	Who acts	Time limit	Effect	Typical use on a catch-up file
Reject the correction	Taxpayer or authorised agent	30 days from issue of the notice	Correction has no effect; original figures reinstated	HMRC has changed a judgement item or misread a disclosure
Accept by doing nothing	No action required	After 30 days	Corrected figures stand; revised calculation and interest follow	The correction is right, or is US-favourable
Amend the return	Taxpayer	12 months from the filing date	Return is changed; may trigger a fresh correction window	Rarely available on old years filed late
Overpayment relief claim	Taxpayer	4 years from the end of the tax year	Relief for tax overpaid outside the amendment window	The fallback where the amendment window has closed

What happens on the US side when the UK number moves?

This is the part that generalist UK commentary does not cover, and it is where the real exposure sits for a US-connected filer.

If you claimed a foreign tax credit on Form 1116 for UK tax, and HMRC subsequently corrects the UK return so that the UK liability for that year is different, you have a foreign tax redetermination under section 905(c) of the Internal Revenue Code. The IRS sets out the triggers in Publication 514, Foreign Tax Credit for Individuals, and they include accrued taxes that differ from the amount claimed when paid, foreign taxes refunded in whole or in part, and exchange-rate movements outside a de minimis threshold.

The direction of the correction changes the analysis completely.

Direction of the HMRC correction	UK effect	US foreign tax credit effect	US action
UK liability increased	Additional UK tax, plus interest from the original due date	More creditable UK tax available for the affected year	Amended US return to claim the additional credit, or absorb through carryover; refund claim window applies
UK liability reduced	UK repayment or reduced balance	Credit previously claimed is overstated	Notification is mandatory; amended US return where US tax changes; penalty exposure for failing to notify
UK liability unchanged in total but reallocated between years	No net UK change	Credit shifts between US years; limitation and basket results move	Notification, and potentially two amended US returns
Correction rejected under s.9ZB(4)	Original UK figures reinstated	No redetermination; original credit stands	Document the rejection in the US file in case the point resurfaces in an enquiry

Notification: Schedule C (Form 1116) or an amended return?

The mechanics were reworked when the IRS introduced Schedule C (Form 1116), Foreign Tax Redeterminations. In outline:

• If the redetermination changes the amount of US tax due for any year, you generally file Form 1040-X for the affected year or years with a revised Form 1116, so that the US tax can be redetermined.
• If the redetermination does not change US tax for any year — or the additional US tax is eliminated by a carryback or carryover of unused foreign taxes — you may instead satisfy the notification obligation by attaching Schedule C (Form 1116) to the original return for the year in which the redetermination occurs, for each affected separate category.
• Notification is generally due by the due date, with extensions, of the return for the year in which the redetermination occurred. The year in which the redetermination occurs is the year HMRC's correction takes effect — not the year the UK tax originally related to.
• Failure to notify carries a penalty under section 6689. Publication 514 puts it at 5% of the tax due resulting from the redetermination for each month or part month the failure continues, capped at 25%, unless the failure is due to reasonable cause and not wilful neglect.

Our dedicated guide on the section 905(c) foreign tax redetermination works through the notification mechanics in detail. The point to grasp here is that the obligation is triggered by the HMRC correction itself, and it is triggered whether or not you agree with the correction — once it stands, it has moved your foreign tax.

Why one UK correction can require two amended US returns

The UK tax year runs from 6 April to 5 April. The US tax year for an individual is the calendar year. A correction to the 2022-23 UK return therefore lands on a period straddling the 2022 and 2023 US returns.

Where the credit was claimed on the accrual basis, the additional UK tax relates back to the UK year to which it relates, and must then be allocated across the two overlapping US years on whatever consistent basis was used originally. Where the credit was claimed on the paid basis, the additional UK tax is generally creditable in the US year in which it is actually paid — which may be a completely different year again, and quite possibly a year in which your other UK tax is low and your limitation fraction is unhelpful. Filers who chose the accrual basis in an early catch-up year are locked into it, which is precisely why that election deserves more thought than it usually gets during a streamlined filing. We cover the election consequences in our guide on the paid versus accrued basis.

Add the separate limitation categories and the picture gets busier still. Additional UK tax on employment income sits in the general category; additional UK tax on dividends, interest or gains typically sits in the passive category. A single correction can therefore change the limitation fraction in one basket, leave another untouched, and cascade through every subsequent year's carryover absorption. If you have a carryover pool, a redetermination in an early year is never a single-year event.

The two-way statute of limitations problem

There is an asymmetry here that catches sophisticated filers off guard. Where the UK correction reduces UK tax and therefore reduces your credit, notification is compulsory and the US tax exposure crystallises. Where the UK correction increases UK tax and therefore increases your available credit, you have to claim it — and claims are subject to their own time limits. The Internal Revenue Code provides an extended period for refund claims attributable to foreign taxes, considerably longer than the ordinary three-year period, but it is not unlimited and it does not start from the date of the HMRC correction. A correction to a UK year from the early 2020s, received in 2026, needs that window checked before anything else is done.

There is also the 24-month rule. Under section 905(c)(2), accrued foreign income taxes that are not paid within 24 months after the close of the tax year to which they relate are treated as if the unpaid portion had been refunded on that date. A catch-up filer who accrued UK tax on an early US return and only actually settled the UK liability years later when the returns were finally filed may already have a redetermination sitting in the file, quite independently of any HMRC correction. This is one of the most commonly missed items in remedial cross-border work, and it is worth checking as part of any streamlined filing review.

A worked sequence: what we actually do when the notice lands

Take a familiar profile. A dual UK-US citizen, resident in London, brings 2019-20 to 2023-24 UK returns up to date in a single submission in March 2026, alongside a streamlined filing on the US side. In July 2026 a correction notice arrives on the 2022-23 return: HMRC has removed relief for a pension contribution that appears twice in the return, increasing the UK liability materially. The 2022 and 2023 US returns have already been filed with foreign tax credits claimed.

1. Diarise the 30 days from the date of issue immediately, and calculate it from the date printed on the notice, not the date it was opened. Confirm agent authorisation is live before doing anything else.
2. Establish whether HMRC is right. Pull the submission file. Was the contribution genuinely duplicated, or does the second entry reflect a different scheme or a carry-forward? A duplication is an obvious error and a correction is the appropriate tool. A carry-forward is a matter of substance, and correction is arguably the wrong tool for it.
3. Model the UK outcome both ways — additional UK tax plus interest from the original due date if accepted, versus reinstated figures plus the realistic probability of an enquiry if rejected.
4. Model the US outcome both ways. This is the step generalist advice skips. If the UK liability rises, the credit position on the US side may improve enough to offset a meaningful part of the UK cost — or the additional UK tax may fall into a basket where it simply builds an unusable carryover.
5. Allocate across US years. Split the 2022-23 UK year across the 2022 and 2023 US returns on the basis already used, and recompute the limitation for both years.
6. Choose the notification route. Amended returns where US tax moves; Schedule C (Form 1116) attached to the 2026 US return where it does not.
7. Check the refund claim window before assuming an increased credit is recoverable.
8. Document everything in a single cross-border file note: the notice, the decision, the reasoning and the US filings made in consequence. If this year is ever picked up in an enquiry or an IRS examination, that note is the evidence that the treatment was considered rather than assumed.

When should you reject, and when should you let it stand?

Rejecting costs nothing and preserves your position. That makes it tempting to reject reflexively. On a cross-border catch-up file, that instinct is often wrong.

Reject where the correction changes a matter of judgement rather than an obvious error; where HMRC has plainly misread a white-space disclosure that was included precisely to head this off; where the correction contradicts the underlying records; or where the correction would create a UK figure inconsistent with a position already taken and disclosed on the US return.

Let it stand where the correction is simply right; where the amount is immaterial relative to the cost of contesting it; or — importantly — where the correction increases UK tax in a year where you have unused US capacity to absorb the credit, so that accepting it is close to cost-neutral once both sides are modelled.

Think very carefully where the file has offshore features. Rejection removes the cheap route and leaves HMRC with the enquiry route. For a filer with unreported offshore accounts, an unreported ISA, non-UK pensions or a recently completed disclosure, an enquiry is a materially larger event than a correction — it brings offshore penalty regimes, extended assessment periods and behavioural analysis into play. A correction that costs a few thousand pounds is not worth converting into an enquiry that examines a decade. Where the file involves a live or recent disclosure, coordinate the decision with the cross-border strategy for the whole engagement rather than treating the notice in isolation.

Do not confuse this with the 2026 "correction of errors" reforms

Separately from the section 9ZB regime, HMRC has been consulting on modernising the correction of errors. The proposals contemplate a general obligation on taxpayers to take corrective action when they become aware of an inaccuracy, and a new HMRC "customer correction notice" requiring the recipient either to correct an inaccuracy, make a disclosure, or explain why no correction is needed. The proposals also contemplate treating a failure to take reasonable corrective steps as deliberate for penalty and assessment time limit purposes.

These are proposals. They are not the law that governs the notice on your desk today. A revenue correction notice issued now operates under the existing section 9ZB machinery, with the nine-month HMRC window and the 30-day rejection right described above. It is worth knowing the reforms are coming — a general duty to correct would materially change the risk calculus for anyone sitting on a known error in a filed UK return, and it would interact awkwardly with US filers who discover UK errors only when reconstructing records for a streamlined submission — but do not apply proposed rules to a live notice.

Evidence, records and the cross-border file

Whether you reject or accept, the file needs to carry the decision. For UK purposes, retain the notice, the rejection (if made), the evidence supplied and HMRC's response. For US purposes, retain a computation showing the UK tax before and after the correction, the allocation across US years, the limitation recomputation for each affected basket, and copies of the amended returns or Schedule C filings made in consequence.

Two practical points. First, if you supply evidence with a rejection, supply the evidence that answers the specific point — a P60 that shows the correct figure, or a scheme statement that shows two genuinely different contributions — not a general bundle. Second, keep the US and UK numbers reconciled in a single working. In our experience, most section 905(c) failures are not decisions to ignore the rule; they are the consequence of a UK correction and a US return being handled in different files by different people, with nobody joining them up.

How Jungle Tax handles revenue correction notices for US-connected filers

We prepare returns on both sides of the Atlantic, which means a correction notice is assessed once, against both. We check the statutory position rather than the covering letter, we calculate the rejection deadline from the date of issue, we model the UK and US outcomes together before recommending a course, and we make the consequential US filings in the same engagement rather than leaving them to surface in a later year. For high-net-worth clients working through a multi-year catch-up, this is not an optional refinement — the fresh nine-month correction window opened by every late return means correction notices are a predictable feature of the process, not an anomaly.

If a revenue correction notice has landed on a UK return that supports a foreign tax credit on your US filings, the clock is already running. Contact our cross-border team for a confidential consultation. We will establish the deadline, assess whether the correction should be rejected or accepted, quantify the effect on both sides, and handle the UK response and the US notification as one piece of work. You can also review our wider US tax services and our approach to high-net-worth cross-border engagements.