GP, Local Authority, or Independent Assessor: Who Should Carry Out a Mental Capacity Assessment? It’s one of the most common questions I hear, particularly from families who’ve suddenly found themselves trying to navigate the Mental Capacity Act 2005 for the first time. “Can our GP do this?” or “Isn’t this something the council should sort out?”
The honest answer is: it depends on the situation. And getting that answer right matters.
The MCA Doesn’t Have a Job Title in Mind
The Mental Capacity Act 2005 doesn’t say that only doctors or psychiatrists can assess capacity. What it says is that the person making a decision, or carrying out an act on behalf of someone else, must take reasonable steps to establish whether that person has capacity for that specific decision.
The Act sets out two things you have to address. First, a diagnostic question: is there an impairment of, or disturbance in, the functioning of the mind or brain? Second, a functional question: is the person unable to understand, retain, use or weigh the relevant information, or communicate their decision?
Those tests apply to GPs, hospital teams, local authority staff, families, deputies, and independent assessors alike. The job title isn’t what matters. What matters is whether the person assessing actually applies the MCA correctly and records their reasoning clearly.
How GPs, Local Authority Social Workers, and Independent Assessors Compare
Each option has genuine strengths. None of them is right for every situation. Here’s how they tend to differ in practice.
A GP’s primary accountability is to the NHS and their practice contract. Their day-to-day focus is diagnosing, treating, and monitoring health conditions, which means they know the patient medically and can link capacity to a diagnosis.
Families often trust them, too, which counts for something. The limitation is time.
Capacity assessments carried out in a GP setting can be brief, and the written record does not always follow the MCA’s two-stage test in a way that would satisfy a court.
They work well for straightforward, low-risk decisions where there is no disagreement and no expectation of legal scrutiny.
A local authority social worker is accountable to the council and its statutory duties. They spend their working lives understanding daily living, risk, support networks, and care options, which gives them a practical, grounded perspective.
The concern in some situations is that they are also involved in arranging services and managing budgets, which can create a perceived conflict of interest, particularly where the decision will affect costs or placement.
Quality and capacity to carry out detailed assessments can also vary. They are generally well suited to day-to-day care planning, safeguarding, DoLS and LPS applications, and care home arrangements.
An independent assessor, such as AJH Social Work, is accountable to the person being assessed, the referrer (often a solicitor or deputy), and the Court of Protection where relevant.
The focus is specifically on producing thorough, legally sound MCA assessments and best interests reports. The strengths are time, independence, and legal literacy.
The limitations are worth being honest about: I am not embedded in a GP practice or council, so I need to gather background information from other sources, and there is a fee involved.
Independent assessments are best suited to high-stakes decisions, including Court of Protection applications, large gifts, contested residence or care arrangements, and professional deputyship work.
When a GP Assessment Is Perfectly Reasonable
There are many situations where asking the GP to assess capacity is entirely appropriate. If the decision is narrow and clinical, say consenting to a routine medical treatment with low risk and no disagreement, then a GP is well placed to do this. If everyone involved broadly agrees on the person’s presentation and wishes, and there is no concern about undue influence or safeguarding, then a GP opinion may be all that is needed.
But even then, the GP must still follow the MCA principles properly. That means starting with the presumption of capacity, attempting to support the person to make the decision, applying the functional test to the specific decision (not capacity in general), and recording how they reached their conclusion.
In my experience, the records do not always reflect that. A note that says “lacks capacity” without any reasoning set out is unlikely to satisfy a court, and it leaves families and professionals exposed if the decision is later challenged.
When Independence Becomes Important
There are situations where using a busy GP, or a local authority worker who is also involved in arranging services, carries real risk. Independence and detailed documentation become as important as the conclusion itself.
When money, property, or inheritance are involved, the stakes change. Large gifts, changing a will, or selling a home to fund care are situations where later accusations of undue influence are common. A detailed, independent capacity report can protect attorneys, deputies, and families from disputes that might otherwise drag on for years.
When family members or professionals disagree, you need more than a brief clinical opinion. I often see situations where one family member says “Mum understands and wants to stay at home,” while another insists she lacks capacity and is not safe. A court expects a clear MCA analysis in those cases, not a paragraph in a GP letter.
When the local authority or NHS has a stake in the outcome, an in-house assessor can be perceived, fairly or not, as influenced by budget pressures or risk management concerns. An independent report gives everyone, including those who may not like the conclusion, more confidence that the analysis is objective.
When you know the decision may go to the Court of Protection, the quality of the evidence really matters. Courts look for a structured application of the Act, clear evidence, and balanced consideration of risks and wishes. Professional deputies and solicitors increasingly commission independent MCA assessments precisely because they know the report has to stand up to legal scrutiny.
The case of Aintree v James is often cited around best interests rather than capacity specifically, but the principle it reinforces is clear: poor, superficial evidence carries less weight than detailed, thoughtful assessments. That applies at every stage.
What an Independent Assessment From AJH Social Work Actually Involves
My role is not to replace your GP or the council social worker. It’s to provide a thorough, independent assessment where the quality of the evidence genuinely matters.
A typical assessment from me will focus on a specific decision, whether that is making a will, selling a property, choosing where to live, making a substantial gift, or agreeing to care arrangements. It will apply the MCA’s two-stage test and four-element functional assessment in plain language that families and courts can follow. And it will take the time to understand the person’s history, values, and usual decision-making style, not just the question in front of us on the day.
I am completely independent from local authority budgets, NHS targets, and care home pressures. Every report I write is prepared with the expectation that it may be read by solicitors, deputies, the Office of the Public Guardian, or the Court of Protection.
Not Sure Which Route Is Right for You?
You’re not choosing between “right” and “wrong” here. You’re choosing between an assessment that is good enough for day-to-day decisions and one that is solid enough to stand up in a dispute, a complaint, or a court.
For some situations, a GP or local authority social worker is entirely appropriate. For others, particularly where there’s disagreement, money is involved, or legal scrutiny is likely, an independent assessment is usually the more proportionate choice.
If you are unsure which applies to your situation, get in touch. I am happy to have an initial conversation with no obligation, to help you work out what you actually need.
Questions People Often Ask About Who Can Assess Capacity
Can a GP carry out a mental capacity assessment?
Yes, a GP can carry out a mental capacity assessment. The Mental Capacity Act 2005 does not restrict this role to any particular profession. What matters is whether the person assessing applies the Act’s two-stage test correctly and records their reasoning clearly. For straightforward, low-risk decisions with no family dispute, a GP is often well placed to do this.
What is the difference between a GP capacity assessment and an independent one?
A GP assessment is usually focused on the clinical picture and may be brief. An independent assessment is carried out by a practitioner with no connection to the NHS, the local authority, or the care provider involved. It follows a structured MCA framework in detail and is written to withstand legal scrutiny, which makes it more appropriate where there is disagreement, financial risk, or likely involvement of the Court of Protection.
When should I ask for an independent mental capacity assessment?
An independent assessment is worth considering when the decision involves significant money or property, when family members or professionals disagree, when there are concerns about undue influence, or when the matter may go before the Court of Protection. In those situations, independence and detailed documentation matter as much as the conclusion itself.
Can a local authority social worker assess mental capacity?
Yes, local authority social workers carry out capacity assessments regularly as part of their Care Act and safeguarding duties. They are skilled at understanding daily living, risk, and care options. Where the local authority also has a financial or organisational interest in the outcome, though, an independent assessor may be better placed to provide an objective and legally defensible opinion.
Does the Mental Capacity Act say who must carry out an assessment?
No. The Mental Capacity Act 2005 places the duty to assess capacity on whoever is making the decision or carrying out the act on the person’s behalf. It does not specify a professional title. The key requirement is that the person assessing applies the diagnostic and functional tests correctly, considers the five MCA principles, and records their reasoning in a way that can be understood and, if necessary, scrutinised.
What happens if a capacity assessment is poorly documented?
A poorly documented assessment is a real risk for everyone involved. If a record simply states that someone “lacks capacity” without explaining how that conclusion was reached, it is unlikely to satisfy a court if the decision is later challenged. Families, attorneys, and deputies can find themselves exposed if the reasoning behind a significant decision cannot be clearly demonstrated.
How do I know if I need an independent assessment or a GP opinion?
Ask yourself whether the decision involves significant financial risk, whether there is any disagreement between family members or professionals, and whether the matter might end up before the Court of Protection. If the answer to any of those is yes, an independent assessment is usually the safer choice. If you are unsure, I am happy to talk it through with you before you commit to anything.
