Receiving a VAT assessment is not the end of the road, it is the start of the formal dispute process. The 30-day deadline is real and the procedural steps matter enormously. This guide takes you through the full appeals journey: from the day the assessment lands to settlement or Tribunal decision, with practical guidance on when to review, when to appeal and when to consider alternative routes.
On this page
- What triggers a VAT assessment
- The 30-day appeal window
- HMRC internal review (s83A)
- Preparing a review submission
- Appealing to the First-tier Tribunal
- Standard Tribunal directions
- Alternative Dispute Resolution
- Hardship applications
- Protective claims
- Settling before the hearing
- When to appeal versus settle
- Section 84 grounds of appeal
What triggers a VAT assessment
A VAT assessment is a statutory demand for unpaid VAT. HMRC has two principal powers to raise them:
Section 73 VATA 1994, best judgment assessment
Where a VAT return has not been submitted or where HMRC believes a submitted return contains errors, section 73 allows HMRC to assess the amount of VAT “to the best of its judgment”. The “best judgment” test does not require HMRC to be right; it requires HMRC to have genuinely considered the available evidence and arrived at a figure in good faith. An assessment made without genuine consideration of the evidence or in a wholly arbitrary manner, can be challenged on that ground alone.
Section 77 VATA 1994, prescribed accounting period
Section 77 sets the time limits within which assessments must be issued. An assessment raised outside the section 77 time limits is invalid, regardless of the underlying liability. Time limit challenges should always be considered: they are a complete defence if made out.
Other triggers
Specific assessment powers exist for other VAT decisions: adjustments to partial exemption methods, denial of zero-rating or reduced rating, MTIC-related input tax denials and penalties assessed separately from the underlying tax. Each carries its own appeal provisions, most feeding into the same first-tier Tribunal process under section 83G VATA 1994. For MTIC-specific issues, see our dedicated MTIC and carousel fraud guide.
The 30-day appeal window
Under section 83G VATA 1994, an appeal or a review request must be made within 30 days of the date of the decision being appealed. The date that counts is the date of the assessment letter, not the date you receive it.
What happens if you miss the deadline?
A late appeal can still be accepted. The Tribunal has discretion to extend time under Rule 5 of the Tribunal Procedure (First-tier Tribunal)(Tax Chamber) Rules 2009. The leading case is BPP Holdings Ltd v HMRC [2017] UKSC 55, which confirmed that the Tribunal has an overriding objective to deal with cases fairly and must balance the interests of both parties when deciding whether to admit a late appeal.
Factors the Tribunal considers include: the length of the delay, the reason for it, whether HMRC has been prejudiced, the strength of the underlying appeal and the conduct of the parties. A short delay with a good explanation (for example, that specialist advice was being sought) is almost always admitted. A delay of many months with no good reason is not.
HMRC internal review (section 83A)
Section 83A VATA 1994 gives the taxpayer the right to request that HMRC review its own decision. The review is conducted by an HMRC officer who was not involved in the original decision. The review officer has full statutory authority to uphold, vary or cancel the decision under review.
The review timetable
Once a review is requested, HMRC has 45 days to complete it (section 83E VATA 1994). If HMRC does not issue a review conclusion within 45 days, the decision under review is treated as having been upheld and the 30-day period for a Tribunal appeal begins to run automatically. Extensions to the 45-day period can be agreed in writing between the parties.
What the review officer considers
The review officer is not bound by the original officer’s reasoning. She or he will read the full file, consider any new evidence or legal argument submitted with or after the review request and form an independent view. Review officers have authority to settle cases where the legal or factual position is genuinely unclear, but they are not a complaints mechanism and will not cancel an assessment simply because the taxpayer disagrees with it.
Review statistics
HMRC’s published tribunal statistics indicate that internal reviews result in the decision being changed, either by varying the assessment or cancelling it, in approximately 25–35% of VAT cases. The variation rate is higher in cases where new factual evidence is presented at the review stage than in purely legal disputes, where the reviewing officer is more likely to refer the case to the Solicitor’s Office for legal input.
Preparing a review submission
The review submission is your opportunity to present your case systematically. A well-prepared submission significantly increases the probability of a favourable review outcome. The following structure works well:
- Executive summary. One page setting out the issue, the amount in dispute and the outcome sought. Review officers handle large caseloads; a clear summary is read carefully even if the rest is not.
- Factual background. A chronological account of the material facts, cross-referenced to the evidence bundle.
- Technical grounds. Each ground of challenge set out separately, with the supporting statutory authority and case law. HMRC officers at review level understand VAT law; do not over-simplify.
- Evidence bundle. Indexed, paginated and referenced in the body of the submission. The review officer should never have to search for a document.
- Proposed outcome. State clearly what you are asking the review officer to do: cancel the assessment, reduce it to a specified figure or refer a specific issue to a senior officer.
New evidence introduced at the review stage that was not available during the enquiry is generally admissible. Evidence that was available but not produced during the enquiry is admissible but may be given less weight, and HMRC may comment adversely on the late production.
Appealing to the First-tier Tribunal
Where the review confirms the assessment or where the taxpayer chooses to bypass the review and appeal directly, the appeal is lodged with the First-tier Tribunal (Tax Chamber). The Tribunal is an independent judicial body with full power to substitute its own decision for HMRC’s.
Lodging the notice of appeal
The notice of appeal (form T240) is lodged with the Tribunal directly, not with HMRC. It must set out the decision being appealed, the date of the decision and the grounds of appeal. The grounds do not need to be exhaustive at lodgement stage, they can be expanded in the statement of case, but they must identify the nature of the challenge.
The Tribunal’s powers
In a VAT assessment appeal, the Tribunal can allow the appeal, dismiss it or vary the assessment in any amount. This includes both reducing and increasing the assessment: if new evidence reveals additional tax is owed, the Tribunal can find for HMRC on a larger figure than originally assessed. In practice, this very rarely happens where the taxpayer is professionally represented, but it is a theoretical risk to consider in cases where the liability is genuinely uncertain.
Standard Tribunal directions
After an appeal is lodged, the Tribunal issues standard case management directions. In a straightforward VAT assessment appeal, the typical timetable from lodgement to hearing is 12–18 months, though complex cases can take considerably longer. Standard directions typically require:
- HMRC to serve a statement of case within 60 days
- The appellant to serve a reply within 42 days of the statement of case
- Both parties to exchange witness statements and documentary evidence at a set date prior to hearing
- A listing call where the Tribunal confirms the hearing date and time estimate
The standard directions can be varied by agreement between the parties and by application to the Tribunal. Early engagement on directions, including seeking extended time where the evidence base is complex, is a mark of a well-prepared case.
Alternative Dispute Resolution
HMRC offers Alternative Dispute Resolution (ADR) for most types of tax dispute, including VAT assessments. ADR is a facilitated process: a neutral HMRC mediator helps the parties identify the areas of genuine disagreement and work towards a resolution. It is not binding and either party can withdraw.
When ADR is worth pursuing
ADR works best where the dispute involves factual disagreement or valuation, rather than pure legal argument. It is particularly effective where:
- The parties have become entrenched in their positions and direct communication has broken down
- There is genuine uncertainty on both sides about how a Tribunal would decide the case
- The cost of Tribunal litigation is disproportionate to the amount at stake
- Speed of resolution is important (ADR typically concludes within 3–4 months)
When ADR is not appropriate
ADR is generally not worth pursuing where the dispute turns on a point of pure legal interpretation that needs Tribunal or Court authority to settle. Where you have a strong legal case, a Tribunal decision creates a binding precedent; an ADR settlement resolves only your case.
Hardship applications
A VAT assessment is payable notwithstanding an appeal. Where payment would cause serious financial hardship, section 84(3A) VATA 1994 allows the taxpayer to apply to the Tribunal for a direction that payment is not required while the appeal is pending.
The Tribunal must be satisfied that payment would cause hardship. This is a factual test: the applicant must produce evidence of its financial position, typically including management accounts, cash-flow projections and evidence of any steps already taken to raise funds. The Tribunal must weigh the hardship to the appellant against HMRC’s interest in collecting tax that is in principle due.
Interest accrues on outstanding assessments during the hardship period at the statutory rate. A successful hardship application is therefore not cost-free, but where it preserves the business pending the appeal outcome it will often be the right decision.
Protective claims
Where a legal point is uncertain and its resolution may give rise to a right to repayment or a lower liability, a protective claim preserves the right to that repayment even while the main appeal proceeds. The most common example in VAT practice is claiming repayment of overpaid output tax on the basis of a legal argument that has not yet been decided by the courts.
Protective claims are also used where a European Court decision is awaited. A business that does not submit a protective claim during the relevant four-year period may find the limitation period has expired by the time the legal question is finally resolved, even if the outcome of that resolution is in its favour.
Settling before the hearing
The large majority of VAT assessment appeals settle before a Tribunal hearing. Settlement can happen at any stage: during the review, after the appeal is lodged but before directions are issued, after the statement of case or even on the steps of the Tribunal. HMRC Solicitor’s Office will take over the conduct of the case once it is set down for hearing.
Settlement produces a consent order or a signed agreement. The agreement will set out the agreed assessment figure, any interest and penalties and the costs position. Where penalties are included, the agreed penalty should reflect the correct behaviour categorisation and quality of disclosure, these are not merely bookkeeping entries and have potential implications for the business’s compliance history.
When to appeal versus settle
The decision whether to pursue an appeal to hearing or settle involves a cost-benefit analysis on several dimensions:
- Strength of the legal/factual case. A case with a 70% chance of success still fails 30% of the time. A realistic probability assessment from an experienced specialist is the starting point.
- Amount at stake. Tribunal litigation is expensive. Legal costs for a contested VAT assessment appeal typically run to £15,000–£50,000 depending on complexity. For smaller assessments, settlement may be economic even where the technical position is strong.
- Precedent value. If the same issue affects multiple periods or multiple group entities, winning at Tribunal is worth significantly more than the immediate assessment figure. This weighs towards appeal.
- Reputational risk. Tribunal decisions are public. Where the case involves conduct that would be embarrassing if reported, settlement has a non-financial value.
- Time and management distraction. A contested Tribunal hearing requires significant management time for witness preparation and evidence gathering. This cost is real even if not always quantified.
Section 84 grounds of appeal
Section 84 VATA 1994 restricts the grounds on which a VAT appeal can be brought in certain respects. It also sets out special rules for assessments made to best judgment: in a section 73 appeal, the Tribunal is not required to limit its decision to the precise legal argument put by either party and may find the correct figure even if that was not the specific case made. This breadth can be advantageous where the assessment methodology was wrong even if the underlying liability is real.
The main categories of ground commonly run in VAT assessment appeals are:
- The assessment was not made to best judgment (section 73), it was arbitrary or not based on the evidence
- The figures are incorrect as a matter of fact
- The assessment was issued outside the time limits in section 77
- The legal characterisation of the transaction is wrong (for example, the supply was zero-rated, not standard-rated)
- The penalty behaviour categorisation is wrong (see our VAT penalties guide)
- HMRC failed to follow its own published guidance, creating a legitimate expectation of a different outcome
- The decision was procedurally irregular
Frequently asked questions
How long do I have to appeal a VAT assessment?
You have 30 days from the date of the VAT assessment (or other appealable decision) to either request an HMRC internal review under section 83A VATA 1994 or appeal directly to the First-tier Tribunal (Tax Chamber). Missing the 30-day deadline does not automatically end your case, but you will need to apply for a late appeal and give HMRC and the Tribunal good reasons for the delay. Applications for late appeals succeed less often than timely appeals, so the deadline should be treated as hard.
What is an HMRC internal review and is it worth doing?
An HMRC internal review under section 83A VATA 1994 is a reconsideration of the decision by an HMRC officer who was not involved in the original enquiry. The review officer has full power to uphold, vary or cancel the decision. HMRC’s own statistics show that reviews change the outcome in around 25–35% of VAT cases. A review is worth pursuing where the original officer has made a factual or procedural error, but it should not be assumed to be a second bite at the same cherry, the review officer will read the full file.
Do I have to pay the VAT assessment while I appeal?
Yes, in most cases. A VAT assessment is due and payable notwithstanding an appeal or review request. However, if payment would cause serious financial hardship, you can apply for a hardship direction under section 84(3A) VATA 1994, which requires the Tribunal to be satisfied that payment would cause financial hardship. If hardship is granted, you do not have to pay the disputed amount while the appeal is pending. Interest continues to run on unpaid amounts, so hardship applications involve a cost-benefit calculation.
What are the grounds for appealing a VAT assessment?
The main grounds of appeal against a VAT assessment are set out in section 84 VATA 1994 and the general principles of administrative law. They include: the assessment was not made to best judgment (s73 VATA 1994), the figures are incorrect, the assessment was issued outside the statutory time limit, the prescribed accounting period was wrongly identified, the penalty behaviour categorisation is wrong or there is a legal or technical error in the decision. Procedural grounds can also found a successful appeal in appropriate cases.