Most HMRC problems do not start with fraud investigations or dramatic raids.

They usually start with something small:

• a missing record
• an unclear explanation
• a careless comment
• or a delayed response

And often, what makes the situation worse is not the original mistake. It is how the person handles communication with HMRC afterwards.

In many cases, people accidentally escalate simple issues into larger enquiries because they panic, over-explain, or say the wrong thing at the wrong time.

In this guide, we break down five things you should never say to HMRC and what to do instead if you want to stay in control of the situation.

1. “I Don’t Have Any Records”

This is one of the biggest red flags you can give HMRC.

If HMRC asks for:

• receipts
• invoices
• mileage logs
• bank statements
• bookkeeping records

and your response is:
“I don’t have them”
or
“I can’t find them”

the situation can quickly become more serious.

HMRC expects businesses and self-employed individuals to maintain proper records. If records cannot be provided, HMRC may:

• estimate your figures instead
• disallow expenses
• widen the enquiry
• apply penalties

And those estimates are rarely favourable.

For example, where expenses cannot be evidenced, HMRC may treat much more of your income as taxable profit than you originally reported.

A far better response is:
“I’ll gather the records and provide them within 7 to 14 days. Can you confirm exactly what you need?”

That keeps the conversation controlled and cooperative without immediately weakening your position.

2. Over-Explaining the Situation

This is one of the most common mistakes people make.

HMRC asks one specific question, and the response turns into:

• a full business history
• unrelated explanations
• additional undeclared details
• emotional reactions

The problem is that every extra detail can create new questions.

What started as a simple request can become:

• a wider review
• additional years being checked
• new areas of enquiry

The key point is this:
You should answer the question asked, not every question HMRC has not asked yet.

A good example from your script involved a subcontractor who was only asked to provide mileage calculations for one return. Instead of simply sending the figures, he challenged HMRC over the phone, explained that estimates had always been used, and mentioned that others in his industry did the same.

The result:

• the enquiry widened
• multiple previous years were reviewed
• other individuals became involved

The issue escalated because of how the conversation was handled, not just because of the numbers themselves.

Where possible:

• keep communication factual
• stay calm
• avoid emotional responses
• keep things in writing

Written communication is often easier to manage clearly and professionally.

3. “I Didn’t Know”

This feels honest to many people, but from HMRC’s perspective it can create a problem.

HMRC generally expects taxpayers to understand their obligations or seek advice where needed.

Saying:
“I didn’t know”
or
“I didn’t realise”

can lead HMRC to categorise the issue as careless behaviour.

And that matters because penalties are based heavily on behaviour.

Potential penalties can include:

• careless errors
• deliberate behaviour
• deliberate and concealed behaviour

The more serious the classification, the higher the penalties become.

Interest also applies on unpaid tax, which increases the total cost further over time.

A better response is:
“I want to correct this. Can you confirm what needs to be updated?”

That shows cooperation and intent to resolve the issue without immediately admitting carelessness.

4. “My Accountant Handled That” or “I Followed HMRC Guidance”

This catches out many business owners.

A lot of people assume:

• using an accountant
• following online guidance
• copying what others do

completely protects them.

Unfortunately, it does not.

HMRC guidance is general and may not reflect your specific circumstances.

And even if an accountant prepares the return, you are still legally responsible for the information submitted under your name.

This means:

• incorrect assumptions can still trigger penalties
• relying on industry habits is not a defence
• copying others can create wider compliance problems

A much safer approach is:

• seek advice where necessary
• document decisions properly
• confirm how rules apply to your specific situation

Tax rules often depend on details that generic guidance does not fully cover.

5. “I’ll Deal With It Later”

Ignoring HMRC is one of the fastest ways to lose control of a situation.

What begins as:

• a missed payment
• a delayed response
• a forgotten deadline

can quickly escalate into:

• penalties
• interest
• enforcement action

HMRC has significant collection powers.

These can include:

• debt recovery action
• collection enforcement
• direct recovery from bank accounts in certain cases

Once enforcement begins, cash flow pressure becomes a much bigger issue.

The better option is to act early.

If payment is difficult:

• contact HMRC
• discuss a Time to Pay arrangement
• seek professional advice before the situation worsens

Early action almost always creates more flexibility and better outcomes.

Why Communication Matters So Much

One of the most important lessons in dealing with HMRC is this:

The way you handle the situation can matter just as much as the original issue itself.

Poor communication often leads to:

• wider enquiries
• additional questions
• behavioural penalties
• increased scrutiny

Professional, organised communication helps keep the issue focused and manageable.

How to Protect Yourself

The best protection is preparation.

This includes:

• keeping proper records
• separating personal and business finances
• filing returns on time
• responding calmly and professionally
• getting advice early when unsure

Most HMRC problems become expensive because they are ignored or mishandled for too long.

Final Thoughts

The wrong sentence at the wrong time can make a small tax issue far more serious than it needed to be.

Most people do not intentionally create problems with HMRC. They simply panic, over-explain, or react emotionally under pressure.

Staying organised, keeping records, and communicating carefully can dramatically reduce the risk of escalation.