Receiving a letter from HM Revenue & Customs (HMRC) questioning your company’s tax position can be unsettling, particularly when you believe your business has met its obligations.
Perhaps HMRC has calculated a higher tax liability than expected. Maybe an expense claim has been rejected, a VAT assessment has been issued or a tax relief you believed your company qualified for has been challenged.
Whatever the circumstances, a disagreement with HMRC does not automatically mean your business has acted unlawfully.
The UK tax system provides procedures through which taxpayers can challenge certain HMRC decisions, present supporting evidence and seek independent determination where necessary.
However, the way a business responds can significantly influence the cost, duration and outcome of a dispute.
At Liberty Rock Limited, we believe business owners should understand their rights, responsibilities and available options when dealing with tax disagreements.
This guide explains how HMRC tax disputes arise, what businesses should do when they receive a disputed assessment and how the review and appeal processes generally work.
What Is an HMRC Tax Dispute?
An HMRC tax dispute occurs when a taxpayer and HMRC disagree about a tax matter.
The disagreement may concern the amount of tax payable, the interpretation of legislation, the treatment of a particular transaction or the application of a penalty.
Tax disputes can affect limited companies, partnerships, sole traders and individual taxpayers.
For UK limited companies, common areas of disagreement include Corporation Tax, VAT, PAYE and claims for tax relief.
Not every enquiry becomes a formal dispute.
HMRC may initially request information or clarification as part of a compliance check. A formal dispute may arise when HMRC reaches a decision that the taxpayer disagrees with.
Understanding the stage of the process is important because different rights, deadlines and procedures may apply.
Why Do Tax Disputes Arise?
There are several reasons why HMRC and a business may reach different conclusions about its tax affairs.
Different Interpretations of Tax Legislation
UK tax legislation can be complex, particularly where transactions involve multiple companies, unusual commercial arrangements or specialist reliefs.
A taxpayer may interpret a provision differently from HMRC.
The existence of a disagreement does not automatically establish which interpretation is correct.
Insufficient Supporting Documentation
HMRC may challenge a deduction or relief where the business cannot provide sufficient evidence that the relevant conditions have been met.
For example, a company claiming research and development tax relief may need to demonstrate the qualifying nature of its activities and expenditure.
Errors in Tax Returns
Disputes may arise from incorrect calculations, missing information or inconsistent records.
Some errors can be resolved through clarification or correction without requiring a tribunal appeal.
Disagreement Over the Nature of a Transaction
HMRC may examine whether a transaction has been treated correctly for tax purposes.
This can involve questions about income, expenses, capital expenditure, employment status or the commercial substance of an arrangement.
Penalties and Compliance Decisions
Businesses may also dispute penalties imposed for late filing, inaccuracies or other compliance failures.
The grounds for challenging a penalty depend on the relevant legislation and circumstances.
1. Read the HMRC Decision Carefully
The first step in responding to an HMRC tax dispute is to understand exactly what HMRC has decided.
A letter may contain several important details, including the tax period concerned, the amount assessed, the reasons for the decision and any available appeal rights.
Before responding, identify:
- The type of tax involved.
- The accounting or tax period affected.
- The amount HMRC says is due.
- The legal or factual basis of the decision.
- Whether the letter is a request for information or a formal decision.
- The deadline for responding or appealing.
This distinction is particularly important.
A compliance enquiry letter is not necessarily the same as an appealable assessment or closure notice.
Businesses should avoid assuming that every HMRC communication can be challenged through the same procedure.
2. Check Whether HMRC’s Calculation Is Correct
Before escalating a disagreement, review the relevant financial records and tax calculations.
An assessment may involve differences in accounting treatment, omitted information or adjustments that require clarification.
For example, HMRC may disallow an expense because it considers the expenditure to be capital rather than revenue in nature.
The business should examine the underlying transaction and the applicable tax rules.
Similarly, a VAT disagreement may arise because a transaction has been classified differently from HMRC’s interpretation.
Documents That May Be Useful
Depending on the issue, relevant evidence may include:
- Filed tax returns.
- Statutory accounts.
- Invoices and receipts.
- Bank statements.
- Contracts and commercial agreements.
- Payroll records.
- Correspondence with HMRC.
- Professional tax advice.
- Supporting calculations and schedules.
The objective is to establish the facts before deciding how to challenge HMRC’s position.
3. Understand the Deadline for Appealing an HMRC Decision
Deadlines are among the most important considerations in a tax dispute.
For many appealable HMRC tax decisions, the normal appeal period is 30 days from the date of the decision notice.
However, the applicable deadline and procedure depend on the type of tax and decision.
Some appeals must first be made to HMRC, while other decisions may be appealed directly to the tax tribunal.
Businesses should follow the instructions accompanying the relevant decision and confirm the statutory procedure.
What Happens If You Miss the Deadline?
A late appeal may sometimes be accepted, but permission is not automatic.
The taxpayer may need to explain the delay and satisfy the applicable requirements.
Missing a deadline can therefore make a dispute more difficult to pursue.
A business should seek advice promptly rather than waiting until the deadline is approaching.
4. Contact HMRC to Clarify the Disagreement
Not every dispute needs to proceed immediately to a formal hearing.
In some cases, contacting HMRC can help clarify the basis of an assessment or identify information that has been overlooked.
For example, a company may discover that HMRC has not received a particular document.
Alternatively, the taxpayer may realise that an adjustment was based on a misunderstanding of the underlying transaction.
Providing relevant information may help narrow or resolve the disagreement.
Keep Communication Professional and Documented
When corresponding with HMRC, businesses should aim to provide clear factual explanations supported by evidence.
Written correspondence can help maintain an accurate record of what has been discussed.
It is also important to retain copies of documents submitted and note relevant deadlines.
Informal discussions should not be assumed to suspend an appeal deadline unless there is a clear legal basis for that conclusion.
5. Submit a Formal Appeal Where Appropriate
Where HMRC has issued an appealable decision and the business disagrees, a formal appeal may be appropriate.
The appeal should explain the decision being challenged and the grounds for disagreement.
The process varies depending on the tax and statutory provisions involved.
For example, a company disputing a Corporation Tax assessment may need to appeal to HMRC under the relevant rules.
Other decisions may follow different procedures.
What Should an Appeal Include?
A well-prepared appeal generally identifies:
- The HMRC decision being challenged.
- The relevant tax period.
- The taxpayer’s identifying information.
- The reasons for disagreement.
- The factual and legal basis of the challenge.
- Relevant supporting evidence.
A business should avoid relying solely on a statement that it considers the assessment unfair.
The appeal should explain why the decision is believed to be incorrect.
6. Consider an HMRC Statutory Review
For many tax disputes, an independent review within HMRC may be available.
A statutory review is generally carried out by an HMRC officer who was not involved in making the original decision.
The reviewing officer considers the facts, relevant legislation and arguments presented.
A review can sometimes resolve a dispute without the need for a tribunal hearing.
What Happens During a Statutory Review?
The reviewing officer examines the disputed decision and relevant evidence.
The outcome may be to uphold, vary or cancel the decision.
The review is conducted within HMRC, so it is not the same as an independent judicial hearing.
Nevertheless, it can provide an additional opportunity for the taxpayer’s position to be considered.
How Long Does a Review Take?
HMRC statutory reviews are generally subject to a 45-day period, unless a different period is agreed.
The precise timing and consequences depend on the applicable statutory provisions.
Businesses should check the review notice and relevant guidance carefully.
7. Appeal to the First-tier Tribunal
Where a dispute cannot be resolved through HMRC’s procedures, an eligible taxpayer may be able to appeal to the First-tier Tribunal (Tax Chamber).
The tribunal is independent of HMRC.
Its role is to determine disputes within its jurisdiction according to the law and evidence.
The tribunal may consider matters such as tax assessments, penalties and other appealable decisions.
What Happens at a Tax Tribunal?
The process depends on the nature and complexity of the dispute.
Some cases may be decided on written submissions, while others require a hearing.
The parties may present documents, witness evidence and legal arguments.
The tribunal then reaches a decision based on the applicable law.
Can a Business Represent Itself?
Businesses may be able to represent themselves in tribunal proceedings.
However, complex disputes can involve technical legislation, evidential requirements and procedural rules.
Professional representation may be appropriate where the financial exposure or legal issues are significant.
8. Understand Whether Tax Must Be Paid During the Dispute
A common question is whether a business must pay a disputed tax liability while an appeal is ongoing.
The answer depends on the type of tax, the decision being challenged and the applicable statutory rules.
For some direct tax disputes, payment may be postponed where the relevant legal requirements are satisfied.
In other circumstances, tax may remain payable despite an appeal.
VAT disputes can involve particular payment or hardship rules.
Certain notices and statutory regimes may also affect payment obligations.
Why Businesses Should Not Assume Payment Is Suspended
Submitting an appeal does not automatically suspend every tax payment obligation.
If payment remains due, interest or other consequences may arise.
Businesses should therefore confirm their position with reference to the specific tax and appeal procedure.
Where appropriate, professional advice should be obtained promptly.
9. Know the Difference Between a Tax Dispute and a Tax Payment Problem
A business may agree that tax is due but struggle to pay it.
This is different from disputing whether the liability is correct.
For example, a company may accept its Corporation Tax calculation but experience temporary cash flow difficulties.
In that situation, the relevant issue may be payment arrangements rather than an appeal.
HMRC may consider a Time to Pay arrangement in appropriate circumstances.
Such arrangements are not guaranteed and depend on HMRC’s assessment of the taxpayer’s position.
When to Contact HMRC About Payment Difficulties
Businesses should contact HMRC as early as possible if they anticipate difficulty meeting a payment deadline.
Waiting until liabilities have accumulated may reduce the available options.
Directors should also understand that proposing an alternative payment method does not itself establish that a tax liability has been settled.
Payments should be made through methods accepted by HMRC, with appropriate confirmation retained.
10. What If HMRC Has Made an Error?
HMRC decisions can be challenged where a taxpayer believes they are incorrect.
However, the appropriate response depends on the nature of the error.
An administrative mistake may be resolved by providing missing information or requesting correction.
A substantive disagreement about tax legislation may require a formal appeal.
A complaint about HMRC’s conduct or service is different from an appeal against a tax decision.
Businesses should identify the appropriate route rather than assuming that a complaint will change an assessment.
Where an appeal deadline applies, pursuing a complaint should not be treated as a substitute for protecting appeal rights.
11. How Long Does an HMRC Tax Dispute Take?
There is no single timeline for resolving a tax dispute.
Some disagreements can be settled after a short exchange of correspondence.
Others may involve prolonged enquiries, formal reviews or tribunal proceedings.
The duration can depend on:
- The complexity of the tax issue.
- The amount and quality of supporting evidence.
- Whether the relevant facts are disputed.
- The availability of professional representation.
- The need for expert evidence.
- HMRC’s response times.
- Tribunal scheduling and procedural requirements.
Businesses should consider the potential financial and administrative costs when deciding how to manage a dispute.
A strong factual and legal position is important, but so is an understanding of the resources required to pursue it.
12. How UK Businesses Can Reduce the Risk of Future Tax Disputes
Not every disagreement with HMRC can be prevented.
However, businesses can reduce avoidable compliance risks through consistent financial management.
Maintain Accurate Accounting Records
Reliable records support tax calculations and make it easier to explain transactions during an enquiry.
Review Tax Returns Before Submission
Errors in calculations or incomplete disclosures can create unnecessary complications.
Document Significant Tax Decisions
Written advice and supporting analysis can help explain the basis of a particular tax treatment.
Monitor Changes in Legislation
Tax rules and HMRC guidance may change over time.
Seek Specialist Advice for Complex Transactions
Restructuring, cross-border arrangements and unfamiliar tax treatments may require additional professional scrutiny.
Respond Promptly to HMRC Correspondence
Delays can lead to missed deadlines and procedural difficulties.
These practices support a more organised approach to tax compliance.
The Importance of Professional Advice During an HMRC Dispute
Tax disputes can involve questions of law, accounting treatment and evidence.
Professional advice can help a business understand the strengths and weaknesses of its position, identify relevant documents and assess the available procedures.
However, businesses should also understand the scope of any professional engagement.
An adviser may be appointed to review an assessment, prepare an appeal or represent the taxpayer in discussions.
The precise responsibilities should be agreed clearly.
At Liberty Rock Limited, we believe that informed decision-making is particularly important when businesses face financial or regulatory uncertainty.
Our educational resources aim to help business owners understand tax processes, ask appropriate questions and recognise when specialist assistance may be required.
Frequently Asked Questions
Can I dispute an HMRC tax assessment?
Yes, many HMRC tax assessments and decisions carry statutory appeal rights. The relevant procedure and deadline depend on the type of decision.
How long do I have to appeal an HMRC decision?
For many tax decisions, the normal appeal deadline is 30 days from the date of the decision notice. However, different rules may apply, so check the notice and relevant legislation.
Does appealing an HMRC decision stop me from having to pay?
Not necessarily. Payment obligations depend on the tax and applicable appeal rules. Businesses should not assume that an appeal automatically suspends payment.
Can I take HMRC to court over a tax dispute?
Many tax disputes can be brought before the First-tier Tribunal (Tax Chamber), subject to statutory requirements and jurisdiction.
What should I do if I cannot afford to pay my tax bill?
Contact HMRC promptly to discuss your circumstances. A Time to Pay arrangement may be available, depending on the facts.
Can HMRC change its decision after an appeal?
Yes. Depending on the applicable procedure and evidence, HMRC may amend or withdraw a decision, or a reviewing officer or tribunal may reach a different outcome.
Conclusion: A Tax Disagreement Requires a Structured Response
An HMRC tax dispute can create uncertainty for any business.
However, disagreement does not automatically mean that a taxpayer has acted unlawfully or that HMRC’s initial position is necessarily correct.
The UK tax system provides procedures for challenging certain decisions, submitting evidence and obtaining independent determination where appropriate.
The most important first steps are to understand the decision, identify the applicable deadline and review the supporting evidence.
From there, a business can determine whether clarification, a formal appeal, an HMRC review or tribunal proceedings may be appropriate.
A successful approach to tax disputes begins with accurate information, appropriate evidence and a clear understanding of the available legal procedures.
At Liberty Rock Limited, we believe that businesses should be equipped to understand their obligations and make informed decisions when navigating complex tax matters.
Explore more resources on Liberty Rock Insights for practical guidance on Corporation Tax, HMRC compliance and responsible business financial management.