HMRC Penalties

Has HMRC issued you with a penalty notice? Are you facing allegations of late filing, undeclared income, or deliberate errors in your tax returns?

You’re not alone.

HMRC penalties can escalate quickly. What starts as a notice can become a personal liability. Directors and partners can find themselves personally on the hook for sums their businesses owe. Assets can be seized. Bank accounts frozen. Businesses forced to close.

But many people don’t realise this: HMRC penalties can be challenged. And when they’re challenged properly, the results can be dramatic.

As specialist HMRC penalty solicitors, we help businesses and individuals challenge penalties, present compelling cases to HMRC, and avoid the costly tribunal route.

What are HMRC penalties?

HMRC penalties are financial charges imposed when HMRC believes wrongdoing has been committed resulting in unpaid funds to the Crown. This could be VAT, Excise Duty, Income Tax, Corporation Tax, or other taxes and duties.

HMRC penalties are separate from HMRC assessments. An assessment is HMRC’s estimate of how much tax you owe. A penalty is a separate charge for the wrongdoing that led to the unpaid tax. If HMRC issues both, you’ll need to challenge them separately.

Common types of HMRC penalties include:

• HMRC late filing penalties – Charged when you don’t submit returns by the deadline. Self-assessment penalties, for example, start at a fixed £100 and can escalate to daily penalties if the delay continues.
• HMRC late payment penalties – Charged when you don’t pay tax by the due date. Late payment interest is charged at Bank of England base rate +4% and accumulates daily, which means the debt can grow very quickly.
• Failure to notify penalties – If you don’t tell HMRC about a tax liability at the right time, they can charge a penalty based on the potential lost revenue.
• Inaccuracy penalties – Charged when your return or other tax document contains errors resulting in unpaid, understated, over-claimed, or under-assessed tax.
• VAT and Excise wrongdoing penalties – HMRC VAT penalties can be particularly significant, especially where there’s alleged deliberate under-declaration or misuse of VAT schemes.
• HMRC self-assessment penalties – These cover both late filing and late payment for self-assessment returns, with escalating charges the longer the delay continues.
• HMRC corporation tax penalties – Similar structures apply to companies that file late or make errors in their corporation tax returns.
• HMRC compliance check penalties – These arise from HMRC’s increasingly aggressive compliance investigations, often triggered by AI-driven systems that flag mismatches in your records.

If you’ve received an HMRC penalty notice, contact us today on 01908 414990 for urgent advice on your options.

How serious are HMRC penalties?

Very serious. And getting more so.

HMRC has been given significantly more resources and powers in recent years. They’ve recruited thousands of new compliance officers. They’re using AI-driven systems to detect discrepancies. And in suspected fraud cases, they’ve extended the debt recovery window from six to twelve years.

More importantly, they’re using those powers. Winding-up petitions are increasing. Bailiff visits are more common. Bank accounts are being frozen. And when HMRC are out of time on a standard assessment and believe they have a strong case, they’re pushing fraud allegations more heavily and more frequently than before.

Personal liability for directors and partners

This is what catches many people off guard.

In certain circumstances, HMRC can cross wrongdoing penalties over to directors or partners personally. The penalty doesn’t stay with the business. It becomes your personal debt.

If your company can’t pay, you can.

This means your personal assets can be at risk. Your home. Your savings. Everything you’ve worked for can be on the line because of a business tax penalty.

What makes this worse is how HMRC approaches these situations. They treat anyone with a tax liability as a tax defaulter from the outset. The accusatory nature of their approach is something many clients find upsetting, particularly if they’ve never experienced it before. It can feel like you’re guilty until proven innocent. You have to defend your position hard, even when the issue arose from an honest mistake or poor advice.

How are HMRC penalties calculated?

HMRC penalties are behaviour-based. The more serious the behaviour, the higher the penalty.

Penalties are calculated as a percentage of the Potential Lost Revenue (PLR), which is the tax HMRC says was not paid. The percentage depends on how HMRC categorises the behaviour.

The three categories of behaviour

1. Lack of reasonable care
   This is where a mistake was made but HMRC believes the taxpayer should have known better. Reasonable care wasn’t taken in completing the return or meeting obligations.

Penalty range: 15% to 30% of the PLR

2. Deliberate error
   This is where false information was intentionally provided or there was a deliberate failure to comply with obligations.

Penalty range: 35% to 70% of the PLR

3. Deliberate and concealed error
   This is the most serious category. False information was not only deliberately provided, but active steps were taken to hide it.

Penalty range: 50% to 100% of the PLR (or up to 200% for offshore offences)

How the penalty is reduced (or increased)

Within each range, HMRC looks at several factors:

• Whether the error was disclosed – If HMRC was told about the problem before they asked (unprompted disclosure), the penalty will be lower than if they had to investigate first (prompted disclosure).
• Quality of disclosure – How complete and accurate was the information provided? How quickly was it provided? How much cooperation was given?
• Other factors – HMRC will consider the gravity of the wrongdoing, whether there’s been cooperation with their investigation, and whether steps have been taken to put things right.

This is why early specialist advice matters. What’s said to HMRC, when it’s said, and how it’s said can significantly impact the penalty. Get it wrong and the maximum penalty could apply. Get it right and a fraction of that might be payable. Or even better, nothing at all.

As specialists in HMRC penalties, we can provide early advice on whether you’re likely to be successful in challenging the penalty, which helps you make informed decisions about your next steps.

The HMRC review: Your critical opportunity

When HMRC issues a penalty decision, you have 30 days to request a review.

This is your lifeline.

The review is conducted by a different HMRC officer who looks at the decision afresh. You have the opportunity to submit additional information, clarify your position, and make your case properly.

Many businesses waste this opportunity.

THey try to handle it themselves, using ChatGPT of other AI tools to draft responses. They rely on their accountant alone, even though the matter has now moved from accounting into the legal realm. Or they simply dely, thinking they’ll deal with it later.

By the time they realise they need specialist help, they’ve already used their one chance at review. The information they’ve disclosed may have actually made their position worse. And now their only option is an expensive tribunal.

Why the review matters

Once you’ve requested a review, HMRC has 45 days to provide their decision. During this time, there’s the chance to:

• Clarify factual issues they may have misunderstood
• Provide evidence they didn’t previously have
• Make legal arguments about why the penalty should be reduced or removed
• Demonstrate reasonable excuse for any errors or delays
• Show steps taken to comply going forward

Get this right and penalties could be reduced dramatically or removed entirely.

Get it wrong and tribunal becomes the only option.

Don’t waste your review opportunity. Contact us as a matter of urgency on 01908 414990 or email Hello@altion-law.co.uk for specialist advice.

The tribunal trap

Most people don’t understand this about tax tribunals.

A tribunal doesn’t give you a fresh start. It doesn’t allow you to just present new evidence and have HMRC reconsider everything. Instead, a tribunal reviews whether HMRC’s decision was reasonable based on the information they had at the time they made it.

If HMRC wasn’t given the right information at the review stage, it can’t simply be introduced at tribunal. That chance has been lost.

Tribunals can also be expensive. They’re more formal than many people expect. Witness Statements, evidence bundles, and statements of case are all required. If you’re represented (and you should be), legal costs can mount quickly. And in most cases, each party pays their own costs regardless of who wins.

Tribunals also take a long time to be listed, and you may continue to incur interest whilst waiting. Interest is applied to assessments from the date they were raised – you can be waiting three years or more while interest accumulates. And for wrongdoing that’s categorised as deliberate, the penalties could be passed personally to directors.

The review is your chance to avoid all of that. Don’t waste it.

The ChatGPT gamble

It’s understandable why people turn to AI tools when facing an HMRC review. If you’re trying to save money and want to act quickly, they seem like a fast, accessible solution.

But underneath the ease there’s a serious problem.

AI tools aren’t lawyers and what they write isn’t always accurate. One of our colleagues recently tested this with ChatGPT. It confidently cited a law that had been repealed years earlier. The advice wasn’t just unhelpful – it would have actively damaged the client’s case.

HMRC penalties are governed by complex, often updated legislation. What you say to HMRC, when you say it, and how you frame it can determine whether you pay thousands or nothing at all.

If you’ve already used AI to draft part of your response, that’s not necessarily fatal. But it does mean you need specialist legal review before you submit anything to HMRC. Because once you’ve used your review opportunity and got it wrong, your only option is an expensive tribunal.

When accountants aren’t enough

Let’s be clear: Accountants are excellent at what they do. They handle your numbers, file your returns, and manage your tax affairs.

But when you’re challenging an HMRC penalty, you’ve moved from the accounting world into the legal world. The rules are different. The strategies are different. And the stakes are higher.

Some accountants recognise this and work brilliantly alongside lawyers. Others don’t, and their clients pay the price.

Why specialist legal advice matters

You wouldn’t ask your GP to perform heart surgery. You’d want a heart surgeon.

HMRC penalties work the same way.

When HMRC issues a penalty, you need someone who deals with HMRC disputes day in, day out. Someone who knows the legislation, the case law, and the strategies that work. Someone who has legal privilege, so your conversations are protected.

That’s what specialist HMRC penalty lawyers provide:

• Legal knowledge – HMRC penalties are governed by complex legislation. The Finance Act 2007 for failures to notify. Schedule 24 Finance Act 2007 for inaccuracy penalties. Schedule 55 Finance Act 2009 for late filing penalties. Schedule 56 for late payment penalties. Then there’s the case law interpreting all of this. Such as tribunal decisions on what counts as a reasonable excuse … Upper Tribunal guidance on disclosure quality … Court of Appeal rulings on procedural fairness … and much more besides. You need someone who knows the law inside out.
• Legal privilege – When you speak to your accountant, those conversations aren’t legally privileged. If HMRC asks what you discussed, your accountant may have to tell them. When you speak to your lawyer, those conversations are protected by legal professional privilege. You can speak freely about the problems, the risks, and your options without worrying that it’ll be used against you later. This changes the quality of advice you can receive.
• Experience with HMRC – We deal with HMRC every day. We know how they think. We know what arguments they’ll accept and what evidence they need to see. And we know when to push back and when to negotiate. This isn’t theoretical. It’s practical experience built over years of HMRC disputes.
• Protection and peace of mind – We stand between you and HMRC. They contact us, not you. This protects your mental wellbeing and allows you to focus on running your business or living your life, rather than being consumed by an HMRC dispute.
• Commercial thinking – Sometimes the legally correct fight isn’t the commercially sensible fight. We’ll tell you when challenging a penalty is worthwhile and when it’s better to move on. We’ll give you a realistic view of your prospects, the likely costs, and the potential outcomes. We’re here to get you the best result, not to drag you into an expensive legal battle you don’t need.

Taking advice at an early stage can also be cheaper in the long run. In complex cases, early intervention can save thousands of pounds in additional penalties, interest, and legal costs down the line.

For a confidential discussion about your HMRC penalty, call us on 01908 414990 or email Hello@altion-law.co.uk.

What happens if you don’t act (or act too late)?

Delay is expensive.

We see this pattern repeatedly. A client receives an HMRC penalty notice. They think they can handle it themselves. Or they ask their accountant to deal with it. Months pass. The accountant writes a couple of letters. Nothing happens.

By the time they come to us, they’ve already made disclosures that weaken their position. They’ve already used their review. And now they’re facing a tribunal, with all the costs and uncertainty that brings.

When HMRC won’t charge a penalty

HMRC can’t always charge a penalty. There are circumstances where penalties shouldn’t apply.

Reasonable excuse
If you have a reasonable excuse for your failure or error, and you notified HMRC without unreasonable delay after the reasonable excuse ended, HMRC shouldn’t charge a penalty.

What counts as a reasonable excuse? It depends on the circumstances. Serious illness, bereavement, unexpected postal delays, fire or flood affecting your records, or reliance on incorrect professional advice can all qualify. But HMRC’s view of what’s “reasonable” can be strict, so you need to make your case properly.

The wrongdoing wasn’t deliberate
If HMRC has categorised your behaviour as “deliberate” but you can show it was actually a mistake or lack of reasonable care, your penalty drops significantly.

You notified HMRC promptly
If you told HMRC about an error before they asked and without unreasonable delay, you’ll benefit from the lower end of the penalty range (or no penalty at all, depending on the circumstances).

But here’s the challenge: You need to make these arguments properly, with the right evidence and at the right time. That’s where specialist advice becomes essential.

Tax tribunal: The last resort

If you can’t resolve matters at the review stage, your next step is the First-tier Tribunal (Tax Chamber).

You have 30 days from HMRC’s review decision to bring a tribunal claim. Sometimes you can appeal directly to the tribunal without requesting a review first, but this is rare and depends on the circumstances.

What tribunal involves

Tribunals are formal. They’re less formal than the High Court, but they’re still legal proceedings with rules, procedures, and deadlines.

You’ll need to:

• File a notice of appeal setting out your grounds
• Exchange evidence with HMRC
• Prepare witness statements
• Prepare skeleton arguments or statements of case
• Attend a hearing where evidence is tested

This takes time. It takes preparation. And it takes money.

The cost of tribunal

Most tax tribunal cases are heard under the “standard” procedure, where each party pays their own legal costs. Even if you win, you don’t usually recover your legal fees.

If your case is allocated to the “complex” category, costs can be awarded to the winning party. But this isn’t automatic and depends on the conduct of both sides.

Either way, if you’re represented properly (and you should be), tribunal costs can run into tens of thousands of pounds. Particularly if HMRC decides to fight hard.

That said, we work with clients to tailor our approach to their budget and the value at stake. Sometimes a staged fee arrangement makes sense. Sometimes we’ll advise that the commercial reality means presenting your evidence properly to HMRC and allowing them to reconsider their position, rather than proceeding to Tribunal. We’re transparent about costs from the outset, and we’ll always tell you whether the fight is worth it.

Why tribunal isn’t a fresh start

Remember: The tribunal only reviews whether HMRC’s decision was reasonable based on what they knew when they made it.

If HMRC wasn’t given the right information during the review, the tribunal can’t just ignore that. Evidence can’t be held back at review and then deployed at tribunal as a “secret weapon” or “trump card”. That’s not how it works.

The tribunal might refer the matter back to HMRC for reconsideration. But even this isn’t the resolution many people expect.

The judge won’t calculate what tax is due, so you won’t walk away with a financial outcome. HMRC may have to answer specific questions posed by the judge, but the judge won’t be able to make rulings on what level of funds are owed in the same way that a court can. And by the time you reach this point, months and thousands of pounds will have been spent, when it could have been resolved at review.

That’s why the review stage is so critical.

How we can help

We specialise in HMRC penalties. It’s what we deal with, day in and day out.

When you’re facing HMRC penalties for undeclared income, late filing, late payment, inaccuracies, or any other alleged wrongdoing, we provide:

• Clear advice on your position
  We review HMRC’s case against you, assess the strength of their position, and tell you realistically what you’re facing. Forewarned is forearmed. You’ll understand your position, the risks, and the costs.
• Strategic response to HMRC
  We help you respond to HMRC properly, with the right information, at the right time, in the right way. We make legal arguments they can’t ignore. And we help you compile evidence that changes their view of your behaviour. Because it’s only when you present a properly prepared case that HMRC will reconsider their position.
• Protection of your interests
  We ensure you don’t inadvertently disclose information that weakens your position. We protect your rights. And we use legal privilege to have frank conversations about your options.
• Representation throughout the process
  If matters escalate to tribunal, we can represent you there too. We’ll prepare your case, present your evidence, and fight for the best outcome.
• Collaboration with your accountant
  We don’t replace your accountant. We work alongside them. They provide the financial expertise and the historical context. We provide the legal expertise and the dispute resolution strategy. Together, we get better results.

What we’ve achieved

We’ve helped clients save hundreds of thousands of pounds in HMRC penalties. In some cases, we’ve had penalties withdrawn entirely. In others, after we presented compelling evidence, HMRC reconsidered their position and significantly reduced their initial demands.

The construction company that faced £270,000? Settled for £22,500.
The client with £20,000 in CGT penalties? Reduced to zero.

These aren’t exceptions. This is what proper legal representation can achieve when you act at the right time with the right strategy.

Are HMRC penalties tax deductible?

No.

HMRC penalties are not tax deductible. You can’t offset them against your business profits or claim tax relief for them.

This makes penalties even more expensive. You’re paying them from post-tax income, so the real cost to your business is significantly higher than the penalty figure itself.

Another reason to challenge penalties properly.

What you should do now

If you’ve received an HMRC penalty notice, don’t wait.

Don’t try to handle it yourself with AI-generated responses. Don’t rely solely on your accountant if the matter has moved into a legal dispute. And don’t let deadlines slip by while you’re “thinking about it”.

Speak to a specialist solicitor. Even if it’s not us. Get proper legal advice before you respond to HMRC, before you make disclosures, and before you waste your one opportunity at review.

The earlier you act, the more options you have and the better your outcome is likely to be.

Contact Altion Law today on 01908 414990 for a confidential discussion about your HMRC penalty. Alternatively, email us at Hello@altion-law.co.uk or complete our Free Enquiry Form and we’ll call you back.

We’ll review your case, explain your options, and give you realistic advice on the best way forward. Whether that’s negotiating with HMRC, requesting a review, or preparing for tribunal, we’ll be with you every step of the way.