# Trustee Duties and Capacity | Nellie Supports Source: https://www.nelliesupports.com/guides/what-duties-must-a-trustee-understand Canonical: https://www.nelliesupports.com/guides/what-duties-must-a-trustee-understand Written by: Ben Slater Source review by: Kerry Slater Source review recorded: 2026-07-19 # What duties must a trustee understand? A trustee needs a practical understanding of the duties relevant to the actual trust. The assessment should use its assets, beneficiaries and decisions rather than a legal knowledge quiz. ## Author and Publication Author: Nellie Supports Ltd Publication Date: 15/05/2026 ​ ## Citation Mental Capacity Act 2005, c. 9. Available at: [https://www.legislation.gov.uk/ukpga/2005/9/contents](https://www.legislation.gov.uk/ukpga/2005/9/contents) ## Copywright Copywright © 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. ## About this guide A trustee needs a practical understanding of the duties relevant to the actual trust. The assessment should use its assets, beneficiaries and decisions rather than a legal knowledge quiz. The sections below explain the evidence, practical steps and limits of the assessment or process. ## What’s on this page - [Contact](https://www.nelliesupports.com/guides/what-duties-must-a-trustee-understand) - [Overview](https://www.nelliesupports.com/guides/what-duties-must-a-trustee-understand) - [Frequently Asked Questions](https://www.nelliesupports.com/guides/what-duties-must-a-trustee-understand) - [Related Pages](https://www.nelliesupports.com/guides/what-duties-must-a-trustee-understand) A trustee needs a practical understanding of the trust’s purpose, terms, beneficiaries and duties relevant to the decisions required. These may include acting within powers, keeping beneficiaries’ interests in proper balance, care in managing assets, avoiding unauthorised profit or conflicts, and keeping appropriate records. The precise duties depend on the trust and applicable law. The assessor should use the actual decisions rather than demand a recital of trust law. ## The office is defined by its duties Asking what duties a trustee must understand is really asking what the office consists of, because a person cannot have capacity to hold an office they cannot comprehend. The duties are the relevant information for trusteeship: that the property is held for others, that the terms of the trust govern what may be done, that beneficiaries must be treated properly and that the trustee must not turn the position to their own advantage. A trustee need not recite trust law, but they must grasp these obligations in working, practical terms. ## The duty to act within the terms of the trust The first duty is obedience to the trust itself: the trustee must understand that the trust document sets the rules, that the property must be dealt with as the trust directs and that they cannot simply do what seems sensible or generous to them personally. In assessment, this is tested through the person's own account of what the trust is for and what it permits, and a trustee who describes the trust property as effectively their own to direct has failed to grasp the duty that defines everything else. ## Duties to the beneficiaries Explore who benefits, what interests the trust recognises and how the trustee must take them into account. Impartial treatment does not always mean equal distributions, and a discretionary trust may permit choices within its terms. Ask the trust’s lawyer to identify the relevant powers and duties so the assessment does not mistake a lawful choice for incapacity or a breach for a cognitive finding. ## The duty of care in managing trust property The trustee must understand that trust assets require active, prudent stewardship: property maintained and insured, money applied properly, advice taken where the trustee lacks the expertise, and records kept of what was done and why. The person does not need investment expertise of their own, but they must recognise that neglect is itself a breach, and that signing whatever is put in front of them without understanding it is not the exercise of the office but the abandonment of it. ## The duty of loyalty: no profit, no conflict Explore the boundary between personal and trustee decisions, including any authority for remuneration, dealings or conflicts. A trustee may also be a beneficiary; the relevant question is whether they understand the separate roles and required safeguards. An apparent conflict or unauthorised transaction may require legal action, but does not by itself establish incapacity. ## Understanding proportionate to the trust As with property transactions, the required understanding scales with what the office actually demands. A bare trustee of a single property awaiting sale must understand comparatively little; a trustee of a discretionary settlement with investments, competing classes of beneficiary and tax consequences must understand far more. The assessment should therefore begin with the actual trust, identify what this office genuinely requires of this trustee and calibrate the relevant information accordingly, rather than testing every trustee against an imagined standard. ## How understanding of the duties is tested The duties are tested through the trustee's own words: whose property is this, who is it for, what does the trust let you do with it, how would you decide between the beneficiaries, what would you do if a proposed step benefited you personally. Scenarios drawn from the trust's real circumstances work far better than abstract questions, and revisiting the same ground later in the conversation tests whether the understanding is held or merely echoed. The person's answers, recorded verbatim, become the core of the evidence. ## What the assessment and report should record The report should set out the trust and its practical demands, the duties identified as the relevant information, the practicable steps taken, the trustee's own explanations, the functional analysis against understanding, retaining, using or weighing and communicating, and the causative link to any impairment found. It should conclude on the office and decisions actually assessed, so that co-trustees, advisers and, where necessary, the court can act upon it with confidence in exactly what it does and does not establish. ## Key takeaway Identify the duties this trust and decision actually require, explain them accessibly and record the trustee’s understanding and reasoning with support. Distinguish incapacity from unfamiliarity, disagreement or a possible breach of duty. Obtain legal advice on powers and replacement routes where needed. ## Frequently asked questions ### Does a diagnosis automatically mean someone lacks capacity? No. A diagnosis alone does not establish incapacity. For a Mental Capacity Act decision, provide practicable support, examine understanding, retention, use or weighing and communication, then explain whether any inability is caused by an impairment or disturbance of mind or brain. The conclusion is specific to the decision and time. ### What evidence helps with trustee capacity? The trust deed and a plain account of what this trusteeship involves in practice: the assets, the beneficiaries and the decisions that recur. The assessor tests the person's grasp of the duties as they bear on those real decisions. ### When might a formal opinion be useful? Assess formally when a trustee's grasp of their duties is genuinely doubted and decisions are pending, particularly investment changes, distributions or dealings with land, where an invalid trustee act creates problems for everyone downstream. A conclusion about one decision does not establish capacity for another. ## Related mental capacity assessment pages The related pages below explain connected decisions, evidence requirements and legal processes. ### Capacity to Act as a Trustee ### What is capacity to act as a trustee? ### Conflicts, risk and undue influence in trustee capacity cases ### Read guide ## Practical next steps Before seeking a report, write down the exact decision, relevant date, reason for concern and intended use. Gather the documents that explain the real options and any communication needs. Check any required form or court direction, agree the scope and total fee, and clarify how missing evidence or further questions will be handled. ## Related information - [Mental Capacity Assessment to Revoke a Lasting Power of Attorney](https://www.nelliesupports.com/lasting-power-of-attorney-services/revoke-lpa) - [NHS Continuing Healthcare Support](https://www.nelliesupports.com/services/continuing-healthcare) - [CHC Appeal Application: Drafting and Submission](https://www.nelliesupports.com/services/continuing-healthcare/chc-appeal-application) --- Nellie Supports Ltd · 0333 987 5118 · nellie@nelliesupports.com Office 11 and 12, Unit 20, Springfield Business Park, Grantham, NG31 7FZ