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In the UK, a court ruling does not automatically reopen every tax return. First establish exactly what the judgment decided for the relevant tax year, then recalculate the return and use the correct route: an ordinary amendment within HMRC’s time limit, a written late correction, overpayment relief, or the procedure for an open enquiry or closure notice. Money paid to another person can still be taxable to you if the law treats you as entitled to the income.
This guide assumes UK HMRC Self Assessment rules. If your return is filed in another country, use that country’s amendment deadlines, limitation rules and court-effect procedures instead.
What a diverted-income ruling can change
“Diverted income” describes an arrangement in which an amount that might otherwise be treated as your income is directed, assigned or paid to somebody else. The tax result depends on the legal rights and statutory rules, not simply on whose bank account received the money.
The First-tier Tribunal made that distinction explicit in Hoyle & Ors v HMRC (26 November 2024): “As a matter of basic tax law, liability to income tax on profits will not always follow the assignment of rights to profits.” The same decision states: “The tax position is not determined by and does not depend on the accounting treatment.” Those observations mean that an assignment agreement, partnership entry or bookkeeping treatment is not by itself proof that the original taxpayer has no taxable income.
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A judgment may affect legal entitlement, attribution, an anti-avoidance rule, transfer-pricing treatment or only HMRC’s administrative practice. The amendment route and any refund therefore depend on the judgment’s precise holding and the status of the affected return.
Decide which correction route applies
| Situation | Usual route | Key limitation or handling point |
|---|---|---|
| Self Assessment return is still within the normal amendment period | Online amendment or replacement paper return | HMRC says corrections are allowed within 12 months of the Self Assessment deadline. |
| Normal amendment period has closed and the ruling means too little tax was paid | Write to HMRC with a late correction | Explain why the original return was wrong and quantify the underpayment; budget for interest and possible penalties. |
| Normal amendment period has closed and you paid too much tax | Written overpayment-relief claim | Claim no later than four years after the end of the relevant tax year, subject to statutory conditions. |
| HMRC enquiry is open | Submit the revised computation through the enquiry channel | Amendments are generally processed when the enquiry ends or a partial or final closure notice is issued. |
| Company accounting period beginning on or after 1 January 2026 | Corporate self-assessment amendment for UTPP, where applicable | This is a corporation-tax process, not an individual Self Assessment amendment. |
Do not choose a route solely because a later judgment appears favourable. Confirm whether the decision is final or under appeal, which statutory provision it interpreted, and whether it applies to the tax year or accounting period you are correcting.
Step 1: Reconstruct the judgment for your exact period
Before changing figures, create a short legal-and-factual summary. Record:
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- the court, decision date and case name;
- the statutory provision or provisions interpreted;
- the tax year, accounting period or transaction covered by the decision;
- whether the judgment is final, subject to permission or under appeal;
- whether it determines legal entitlement, attribution, an anti-avoidance rule, transfer pricing or only HMRC practice; and
- the factual features the court treated as decisive, such as the partnership agreement, assignment wording, control of funds or timing.
Map those findings to your own documents. A case involving a partnership profit allocation may not determine the result for an employment-income assignment, a trust arrangement or a company. If the court decided only that a particular agreement was ineffective, do not assume every agreement with similar labels has the same result.
Also check whether HMRC has issued a closure notice, amended the assessment, or published guidance explaining how it will apply the decision. A judgment can establish the law without creating an automatic administrative reopening mechanism for every closed year.
Step 2: Build a before-and-after computation
Prepare one schedule for each affected year. Keep the original filed figures alongside the corrected figures so HMRC can see exactly what changed.
| Item | Original return | Court-based computation | Difference and explanation |
|---|---|---|---|
| Diverted or assigned amount | Amount excluded, allocated elsewhere or treated differently | Amount included or reclassified under the judgment | Identify the legal reason for the change |
| Taxable income or profits | Filed total | Recomputed total | Show affected schedules and sources |
| Income tax or corporation tax | Tax charged on the filed figures | Tax on corrected figures | Additional liability or overpayment |
| Interest | Interest already paid or charged | Updated amount after correction | Separate statutory interest from tax |
| Losses and reliefs | Claims and carryforwards used | Revised claims and balances | Check later years affected by changed losses |
| Payments on account | Amounts paid or set against the year | Revised balancing payment or repayment | Explain any consequential change |
Revisit claims that depend on adjusted income: loss relief, pension-related limits, charitable-giving relief, high-income benefit charges, payments on account and later-year loss carryforwards. A change in one year can alter another year even when the court ruling concerns only one transaction.
Retain the judgment and any appeal order, the assignment or partnership agreements, partnership statements, invoices, bank records, general ledgers, original computations, filed returns, payment confirmations and correspondence with HMRC. Label each document with the tax year it supports.
Step 3: Amend a return that is still open
HMRC states: “You can correct a tax return within 12 months of the Self Assessment deadline, online or by sending another paper return.” The relevant period is measured from the deadline for that return, not from the date you first hear about the court case.
- Confirm the deadline. Check the filing record for the affected tax year and calculate whether the 12-month amendment period remains open.
- Re-enter the affected schedules. Change the income, partnership, relief, loss, tax and payment-on-account fields that the computation supports. Do not change unrelated figures simply to make the return balance.
- Attach an explanation. State the case name, decision date, statutory provision, affected year and the amount changed. Explain how the judgment applies to your facts.
- Submit through the available channel. Use the online amendment service where the return and schedules are supported; otherwise send a replacement paper return using HMRC’s process.
- Save proof. Keep the submission receipt, amended calculation, payment or repayment record and a copy of every attachment.
If the revised figures increase tax, pay the resulting amount as soon as the amended calculation is available. Waiting for a formal demand can increase interest.
Step 4: Correct a closed return when too little tax was paid
Once the ordinary amendment period has expired, write to HMRC rather than attempting to overwrite the online return. HMRC’s guidance says a late correction should explain why too little tax was paid and how much was underpaid.
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1Scan for outdated or missing drivers - takes under a minute2Clear out junk files and repair common Windows errors3Fix the driver behind crashes, sound loss and screen glitchesYour letter should identify the taxpayer, unique taxpayer reference, tax year, original return date and the judgment relied on. Include the before-and-after computation, the additional income or profit, tax and interest estimate, and copies or a clear description of supporting documents. Ask HMRC to amend the assessment or otherwise record the underpayment under the applicable procedure.
Interest normally runs from the original payment due date. Penalties depend on the facts, including whether the error was careless, deliberate or prompted by HMRC action. A prompt, complete disclosure and early payment can affect penalty treatment, but do not assume that a court-driven correction is automatically penalty-free.
Step 5: Claim overpayment relief for a late refund
If the judgment means you paid too much tax and the normal amendment window is closed, overpayment relief may be available. HMRC states that a claim can be made up to four years after the end of the relevant tax year.
A written claim should:
- identify the tax year and the assessment or return concerned;
- explain why the tax was overpaid, linking the explanation to the court’s statutory interpretation;
- quantify the overpayment and show the calculation;
- state whether you have made a prior appeal or other claim about the same tax;
- include the required signed declaration for an overpayment-relief claim; and
- list and retain the evidence supporting entitlement and amount.
Overpayment relief is not a general backstop for every change in HMRC’s view. HMRC guidance says relief is unavailable where the claim merely reflects HMRC changing its practice on an item. You must therefore distinguish a legal error in the original return, as established by the judgment, from a voluntary administrative change that HMRC could adopt prospectively.
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Fix the driver behind crashes, sound loss and screen glitchesFind Drivers →Clear out junk files and repair common Windows errorsFree Scan →Scan for outdated or missing drivers - takes under a minuteDriver Scan →Do not describe the claim as guaranteed. HMRC may ask for the judgment, agreements, computations, payment records and evidence that the statutory conditions are met. Keep proof of delivery and respond to requests within the stated time.
Step 6: Coordinate an open enquiry or closure notice
If HMRC is enquiring into the return, tell the case officer about the judgment immediately. HMRC enquiry guidance says taxpayer amendments made during an enquiry are generally processed when the enquiry ends or when a partial or final closure notice is issued.
- Send the officer the case citation, decision date, relevant paragraphs and your analysis of how they affect the enquiry issues.
- Submit the revised computation and supporting records through the enquiry channel, following any secure-upload or correspondence instructions.
- Separate agreed points from disputed points. Explain which figures are conceded and which depend on the court’s interpretation or an appeal.
- Check the closure notice carefully. It may amend only the matters within the enquiry and can create a payment deadline even if another year remains open.
An enquiry does not remove the need to quantify consequential changes to losses, reliefs or payments on account. Ask HMRC how those consequential amounts should be reported rather than filing a duplicate amendment that conflicts with the enquiry record.
When the ruling increases your tax
A diverted-income decision can produce an additional liability, as occurred in Burley v HMRC (UK First-tier Tribunal, 14 August 2025). The tribunal recorded additional income-tax figures of £84,415.15 for 2010/11, £106,698.29 for 2011/12, £150,698.30 for 2014/15, £104,303.20 for 2015/16 and £19,852.40 for 2016/17. Those are amounts in that case, not a tariff or estimate for other taxpayers.
Use the following order of work:
- Confirm that the judgment covers your arrangement and tax year.
- Recompute taxable income, reliefs, tax, interest and payments on account.
- Notify HMRC promptly in writing if the normal amendment window is closed.
- Pay the undisputed tax and ask HMRC for the current interest and payment reference.
- Discuss time-to-pay or a formal appeal with a qualified adviser if the amount is disputed or cannot be paid immediately.
Do not net an additional liability against a possible refund for another year unless HMRC has confirmed the set-off. Each year and assessment has its own legal status.
Corporate diverted profits: the UTPP branch
Companies need a separate analysis. HMRC’s current manual says the Unassessed Transfer Pricing Profits charge (UTPP) applies to accounting periods beginning on or after 1 January 2026. A company can amend its corporation-tax self-assessment during the amendment period to reflect HMRC’s view of the maximum unassessed transfer-pricing-profits charge.
UTPP replaced the earlier diverted-profits-tax structure within corporation tax. Do not mix that corporate process with an individual’s Self Assessment amendment: the taxpayer, return, accounting period, computation and payment mechanism are different. A company should reconcile the transfer-pricing analysis, corporation-tax return and any related-party disclosures before submitting an amendment.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Evidence checklist
- Final judgment, appeal notices and any later order.
- Original return, amended return or closure notice for every affected year.
- Assignment, partnership, trust, employment or transfer-pricing agreements.
- Partnership statements, board minutes, invoices and bank statements showing entitlement and payment.
- Before-and-after tax computations, including losses, reliefs and payments on account.
- HMRC correspondence, enquiry questions, payment references and submission receipts.
- Working papers showing how the overpayment or underpayment was quantified.
Common mistakes and how to avoid them
Treating cash destination as the tax answer
Receiving no money does not prove that no taxable income arose. Start with the legal entitlement and the statutory rule applied by the court.
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Using the wrong time limit
The 12-month ordinary amendment period and the four-year overpayment-relief period run from different reference points. Record the exact Self Assessment deadline and the end of the relevant tax year.
Calling an HMRC practice change a court-established overpayment
Overpayment relief is constrained where the claim merely follows a change in HMRC practice. Explain the legal error and the judgment’s effect instead of relying on a policy change.
Ignoring later-year consequences
Revised losses, reliefs or payments on account can alter subsequent returns. Trace every carryforward and claim before submitting the correction.
Filing while an enquiry is open without telling the officer
An uncoordinated amendment can be held until closure or conflict with the enquiry computation. Use the enquiry channel and keep a single agreed set of figures.
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Assuming an appeal has no effect
Check whether the decision is final and whether HMRC or the taxpayer has appealed. Explain any uncertainty in the submission and obtain advice on whether to amend now or preserve a position pending the appeal.
Practical decision framework
| Question | If yes | If no |
|---|---|---|
| Does the judgment’s statutory analysis apply to your facts and year? | Continue to a recomputation. | Do not amend solely because the case has similar terminology. |
| Is the return within 12 months of its Self Assessment deadline? | Use an online or paper amendment. | Use a late correction or overpayment-relief analysis. |
| Does the corrected computation show an underpayment? | Notify HMRC promptly and budget for interest and possible penalties. | Assess overpayment relief if the ordinary window is closed. |
| Is an HMRC enquiry or closure process active? | Coordinate through the case officer and enquiry channel. | Use the ordinary correspondence route for the relevant year. |
| Is the taxpayer a company with an accounting period beginning on or after 1 January 2026? | Consider the UTPP corporation-tax process. | Do not apply UTPP rules to an individual Self Assessment return. |
Bottom line
Amend only after matching the court’s holding to your exact arrangement and period. Recompute the entire tax position, then use the 12-month amendment window, a written late correction, overpayment relief or the enquiry process as appropriate. A diverted payment is not automatically outside your taxable income, and a later judgment is not an automatic refund for every closed return.
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