Why “Just Following HMRC Guidance” Isn’t Always Enough
For many taxpayers, HMRC guidance is treated as the definitive answer.
If it’s on GOV.UK, it must be correct. If it’s written clearly, it must be complete. And if you follow it, you’re safe.
But in practice, that assumption doesn’t always hold.
HMRC guidance is exactly what it says it is—guidance. It is not the law. And while it is often helpful, it can be incomplete, simplified, or occasionally inconsistent with how legislation is ultimately interpreted.
Understanding that distinction is important, particularly in areas where tax treatment is not straightforward.
Guidance vs Legislation: The Key Difference
At the core of the issue is a simple but often overlooked point:
Tax is governed by legislation, not HMRC guidance.
HMRC publishes guidance to explain how it interprets the law. In many cases, that interpretation is reasonable and widely accepted.
However:
- Guidance does not override legislation
- It does not carry the same legal weight
- And it can be challenged
This becomes particularly relevant in areas where:
- The legislation is complex
- The facts are not clear-cut
- Or HMRC’s interpretation evolves over time
Why HMRC Guidance Exists
HMRC guidance serves a practical purpose.
It aims to:
- Simplify complex legislation
- Provide clarity for common scenarios
- Promote consistent treatment
For straightforward matters, this works well. Most routine tax issues can be handled by following published guidance without difficulty.
But problems arise when:
- The situation falls outside the “standard” example
- The guidance oversimplifies the underlying rules
- Or the wording leaves room for interpretation
Where Guidance Can Fall Short
There are several areas where relying solely on guidance can create risk.
1. Oversimplification of Complex Rules
To make guidance accessible, HMRC often simplifies the explanation.
This can lead to:
- Important conditions being glossed over
- Exceptions not being fully explored
- Nuance being lost
What reads as a clear rule may, in legislation, be far more conditional.
2. Lack of Coverage for Unusual Scenarios
Guidance typically focuses on common situations.
If your circumstances are:
- More complex
- Structurally different
- Or involve multiple interacting rules
You may find that the guidance simply doesn’t address your position.
3. Changes in HMRC Interpretation
HMRC’s view of how legislation should be applied can change.
This may happen due to:
- Tribunal decisions
- Internal policy changes
- New areas of focus or enforcement
Where this occurs, earlier guidance may no longer reflect HMRC’s current approach.
4. Conflict Between Guidance and Case Law
Ultimately, courts and tribunals interpret legislation—not HMRC.
There have been cases where:
- HMRC guidance suggested one treatment
- The courts reached a different conclusion
In these situations, the legal position follows the courts.
Does Following Guidance Protect You?
This is where things become more nuanced.
In some cases, following HMRC guidance can support a claim that you took reasonable care.
This may:
- Reduce or eliminate penalties
- Support your position in a dispute
However, it does not automatically mean:
- The tax treatment is correct
- HMRC will not challenge the position
- Additional tax cannot be due
In other words:
You may avoid penalties, but still owe tax.
Where This Causes Problems in Practice
The gap between guidance and legislation tends to show up in specific ways:
Assuming Guidance Is Definitive
Taxpayers apply guidance without questioning whether it fully applies to their situation.
Not Documenting the Position Taken
Where guidance is followed, but no explanation is recorded, it becomes harder to defend the approach later.
Applying General Rules to Specific Situations
Guidance written for broad scenarios is applied to cases with additional complexity.
Failing to Revisit Positions Over Time
What was acceptable based on guidance at one point may not remain so indefinitely.
Practical Approach: Using Guidance Properly
HMRC guidance is still valuable—but it needs to be used correctly.
Treat It as a Starting Point
Use guidance to understand the general position, not as the final answer.
Consider Whether Your Situation Fits
Ask whether your circumstances align with the examples provided—or go beyond them.
Look at the Underlying Rules
For more complex matters, it’s important to understand the legislation or seek advice based on it.
Document Your Reasoning
If you’re relying on guidance, record:
- What you followed
- Why it applies
- Any assumptions made
This can be critical if the position is later challenged.
How Merranti Can Help
The difference between guidance and legislation is not always obvious—but it can have real consequences.
At Merranti Accounting, we help clients:
Interpret the Rules Properly
Not just what HMRC says, but what the legislation requires.
Apply Guidance in Context
Ensuring it fits the specific situation, rather than applying it blindly.
Identify Areas of Risk
Highlighting where reliance on guidance alone may not be sufficient.
Support and Defend Positions
Providing clear reasoning and documentation where judgment is required.
Final Thought
HMRC guidance is useful—but it is not definitive.
Understanding where it helps, and where it falls short, is key to managing tax risk properly.
Because in the end, it’s not guidance that determines the outcome—it’s the law.
