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Author and Publication
Author: Nellie Supports Ltd
Publication Date: 15/05/2026
Citation
39 Essex Chambers, Mental Capacity Guidance Note: Carrying out and recording capacity assessments.
Copywright
Copyright © 2026 Nellie Supports Ltd. All rights reserved.
This article is made available for general information, education and professional reference. It may be downloaded, printed and shared for non-commercial purposes, provided that it is reproduced in full, is not altered in any way, and is properly cited as the work of Nellie Supports Ltd. This material must not be edited, adapted, sold, republished, incorporated into commercial products, or used for commercial training, assessment, report-writing or advisory services without prior written permission from Nellie Supports Ltd.
This article does not constitute legal advice, clinical advice or a substitute for a decision-specific professional assessment. Where legislation, government guidance, court forms or external professional materials are referred to, those materials remain subject to their own copyright, licensing and re-use terms.
Who can assess mental capacity?
Anyone directly concerned with a decision can assess mental capacity informally, and for everyday decisions carers and family members do so constantly under the Mental Capacity Act 2005. Formal assessments for significant decisions, a will, a property sale, court proceedings or deputyship, are different: they should be completed by a professional with relevant registration, training in the two-stage test and experience of the decision type, such as a specialist social worker, psychologist, nurse or doctor. The law sets no fixed list of professions; what matters is competence for the decision in question. This guide explains who assesses what, and when to instruct a specialist.
The quality of the assessment starts before the appointment
A useful assessment depends on clear instructions, the right evidence and a professional who understands the legal test. For mental Capacity Assessor, the assessor needs enough information to understand the decision, the person’s circumstances and the purpose of the report.
Apply the Mental Capacity Act test to this decision
The Mental Capacity Act 2005 requires a structured approach. The person must be presumed to have capacity unless lack of capacity is established. They must be supported to make the decision where practicable, and an unwise decision is not enough on its own. The assessment then asks whether an impairment of, or disturbance in the functioning of, the mind or brain causes the person to be unable to make this decision.
Identify the relevant information
For this topic, relevant information commonly includes the decision to be assessed, why capacity is in doubt, the relevant information, communication needs, practical support, evidence sources, risks, urgency and intended use of the report. The relevant information should be tailored to the person’s actual circumstances. It should not be copied from a generic template if the person’s options, risks or legal context are different.
Gather evidence before drawing conclusions
The assessment is stronger when the evidence is organised before the conclusion is reached. Useful evidence may include the letter of instruction, medical and care records, legal documents, professional notes, family background, communication information and examples of recent decision-making. Where records are missing, contradictory or out of date, the report should say so rather than overstate the certainty of the opinion.
Record practicable steps and communication support
The person should be given a meaningful opportunity to make the decision. This may involve simple language, written summaries, visual aids, additional time, breaks, support with hearing or sight, an interpreter, a familiar setting or a carefully timed appointment. The report should explain what support was tried and whether it helped.
Analyse use and weigh, not just understanding
Many capacity disputes turn on whether the person can use or weigh information, not whether they can repeat it. The assessor should consider how the person reasons through benefits, risks, alternatives and consequences. For mental Capacity Assessor, this means looking at the person’s own explanation and whether any impairment prevents them from weighing the material information.
Consider risk, pressure and vulnerability carefully
Risk features should be recorded without turning them into shortcuts. Common issues in this area include unclear instructions, missing documents, rushed appointments, poor communication support, conflicts of interest and reports that record conclusions without proper analysis. The assessor should distinguish vulnerability, disagreement, family conflict and safeguarding concerns from evidence that the person is unable to make the decision.
What a strong report should contain
A strong report should include the instruction, the specific decision, the legal framework, the relevant information, evidence reviewed, practicable steps, direct assessment findings, functional analysis, causation and a clear conclusion. It should also explain any limitations, such as missing evidence, refusal to engage, fluctuating presentation or the need for further legal advice.
Key takeaway
A good assessment process improves both fairness and evidential value. The person should be supported to decide before any conclusion about incapacity is reached. The safest approach is disciplined and evidence-led: define the decision, tailor the relevant information, support the person, apply the functional test and explain the reasoning clearly.
Frequently asked questions
Does a diagnosis automatically mean someone lacks capacity?
No. A diagnosis may explain why capacity is in doubt, but it does not answer the legal question. The assessment must still consider the specific decision, the relevant information, the support provided and whether the person can understand, retain, use or weigh that information and communicate a decision.
What evidence is useful for Mental Capacity Assessor?
For informal day-to-day decisions, records are rarely needed. For a formal assessment, provide the decision in writing, relevant medical and care records and any legal documents involved, so the professional can anchor the assessment to the specific decision rather than capacity in general.
When is a formal assessment for Mental Capacity Assessor useful?
Instruct a specialist where the decision is significant, contested or court-bound, where the person's presentation is complex, or where earlier informal views conflict with each other. Everyday decisions rarely need formal assessment at all.
Related mental capacity assessment pages
These internal links help readers move from this guide to the most relevant Nellie Supports service page, assessment option or legal framework page.
Wondering who should assess?
Nellie Supports provides independent, decision-specific mental capacity assessments across England and Wales through a permanent employed team of registered professionals, with a same working day response to every enquiry and every report peer reviewed before delivery. Call 0333 987 5118 or visit the mental capacity assessment service page.