Solicitors, will writers and financial advisers often reach for the same question when something about a client’s instructions feels slightly off: does this person have mental capacity to make this decision? It is the right question to ask, but it is not always the right question to answer the actual concern. A client can understand, retain, weigh and communicate a decision perfectly well under the Mental Capacity Act 2005, and still be acting under pressure from someone else entirely.
Mental capacity and undue influence are two separate legal concepts, but the situations that raise one often raise the other too, which is exactly why they get confused. Understanding the difference matters, because the wrong assumption in either direction can leave a vulnerable client unprotected, or a genuinely capable client’s decisions unfairly questioned.
What Mental Capacity Actually Means
Mental capacity, as defined under the Mental Capacity Act 2005, is decision specific. A person is assessed as having capacity to make a particular decision if they can understand the information relevant to it, retain that information for long enough to use it, weigh it up as part of the decision making process, and communicate their decision. Capacity is also time specific, since it can fluctuate, and it is always assumed unless there is clear evidence to the contrary.
This means capacity is never a blanket judgement about a person in general. Someone can have capacity to decide what to eat for dinner but lack capacity to manage a complex financial transaction, and the reverse is just as possible depending on the specific decision in question.
What Undue Influence Actually Means
Undue influence is a different question entirely. It asks whether a decision, even one made by someone with full mental capacity, is genuinely that person’s own free choice, or whether it has been shaped by pressure, manipulation or control from someone else, often someone who stands to benefit from the outcome.
A client can retain every element of capacity required under the Mental Capacity Act and still be acting under undue influence. This is precisely why the two concepts need to be considered separately, even though the same case can involve both.
Situations Where Both Questions Deserve A Closer Look
Certain patterns tend to raise concerns about capacity, undue influence, or both, and are worth paying attention to. These include a family member consistently answering questions on a client’s behalf rather than letting them speak, a client suddenly changing long held wishes without a clear explanation, noticeable reluctance to speak when a particular person is present, or instructions that seem inconsistent with what is known about that client’s usual views and character.
None of these signs confirm either issue on their own. A client can behave slightly differently under stress without lacking capacity or being unduly influenced. What they do is signal that a closer, more considered look is worthwhile before proceeding.
Why An Independent Assessment Helps With Both Questions
A formal, independent mental capacity assessment provides objective evidence about whether a client can make the specific decision being considered, carried out by someone with no relationship to the outcome. Where undue influence is also a concern, that same independent process, conducted properly and face to face, often surfaces observations about the circumstances surrounding a client’s decision making that are useful well beyond the capacity question itself.
This is why an assessment carried out properly, rather than a quick judgement made in the course of a single meeting, tends to give solicitors and other professionals far more confidence in the decisions being made, whichever way the assessment ultimately concludes.
What This Looks Like In Practice
As an independent social worker specialising in mental capacity, I carry out mental capacity assessments face to face, covering areas including capacity relating to Court of Protection matters, testamentary capacity, Lasting Power of Attorney, and capacity to litigate or make a gift. Reports are typically provided within fourteen days of the assessment, giving solicitors and other professionals clear, evidenced findings to work from.
Where a case raises wider concerns alongside capacity, an independent assessment carried out this way can help build a fuller picture of what is genuinely happening, rather than leaving professionals to make a judgement call with only a single meeting to go on.
Bringing It Together
Mental capacity and undue influence ask two different questions, and treating them as the same thing risks missing exactly the kind of situation that most needs closer attention. Knowing the warning signs, and knowing when an independent, properly conducted assessment is the right next step, helps ensure the right evidence is obtained before an important decision is relied upon.
Frequently Asked Questions
Can someone have mental capacity and still be a victim of undue influence?
Yes. Mental capacity and undue influence are separate legal questions. A person can fully meet the test for capacity under the Mental Capacity Act 2005 and still be acting under pressure or influence from someone else.
What kind of situations should prompt a solicitor to look more closely at capacity or undue influence?
Signs worth paying attention to include a family member routinely answering on a client’s behalf, a sudden change to long held wishes without clear explanation, reluctance to speak when someone else is present, or instructions that seem out of character.
Do you carry out mental capacity assessments remotely?
No, mental capacity assessments, including those relating to Court of Protection matters, testamentary capacity, Lasting Power of Attorney, and capacity to litigate or gift, are always carried out face to face.
How long does it take to get a mental capacity assessment report?
Reports are typically provided within fourteen days of the assessment taking place, giving solicitors and other professionals clear findings to work from in good time.
Who is this kind of assessment useful for?
Solicitors, will writers, financial advisers and other professionals working with clients where capacity, vulnerability or undue influence may be relevant, as well as families seeking an independent, professional view.
Discuss A Case Or Book An Assessment
If you are managing a case where capacity, vulnerability or undue influence are in question, an early conversation can help determine the right next steps before important decisions are relied upon. Get in touch to discuss a case or arrange an independent mental capacity assessment.