Author and Publication
Author: Nellie Supports Ltd
Publication Date: 15/05/2026
Citation
GOV.UK, Make, register or end a lasting power of attorney. Available at: https://www.gov.uk/power-of-attorney
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.
Abstract
This guide explains borderline or fluctuating capacity when making an LPA for Mental Capacity Assessment to Grant Lasting Power of Attorney in England and Wales. It gives a decision-specific overview of relevant information, evidence, risk factors, report quality and when a formal assessment may be needed.
Borderline or fluctuating capacity when making an LPA
Borderline or fluctuating capacity is exactly when a professional LPA capacity assessment earns its keep. Capacity to grant a Lasting Power of Attorney is time-specific: a person with a fluctuating condition may meet the test at their better times even if they could not at their worst, and the Mental Capacity Act 2005 requires the assessment to happen at the time and in the way that gives them the best chance. A contemporaneous professional assessment recording that the donor met the test when the LPA was executed is the strongest protection against later objections to registration or validity. This guide explains how borderline cases are approached, timed and evidenced.
Borderline is where the assessment earns its keep
Most LPA capacity questions are easy at the extremes: the donor who plainly understands, the donor who plainly cannot. The instrument's real vulnerabilities live in between, with donors whose understanding is partial, effortful or variable, because these are the cases where a challenge is most plausible and where a signature-day certificate, standing alone, carries least. Borderline and fluctuating presentations are precisely where a formal, well-timed assessment changes the instrument's prospects.
The threshold the donor must reach
The donor must be able to understand, retain, use or weigh the information relevant to making the LPA and communicate the decision. The threshold is the decision's, not perfection's: making an LPA is frequently within the capacity of a person who could no longer manage the underlying affairs themselves, because choosing a trusted decision-maker is a simpler decision than the decisions being delegated. A borderline presentation therefore demands careful assessment against the right threshold, not reflexive refusal.
Fluctuation and the time-specific principle
Capacity is assessed at the time the decision is made, and the law accommodates fluctuation: a donor who can meet the test during their better periods can validly execute an LPA in one, even where other times of day or week would tell a different story. The practical consequences follow directly: identify the donor's better times through family and carers, arrange assessment and execution within them and record why the chosen moment gives a fair picture of the donor at their best.
Assessing across more than one occasion
In borderline and fluctuating presentations, a single visit samples a moment; two or three visits sample the person. Repeat assessment serves two purposes: it tests whether understanding is stable enough to be relied upon, and it evidences retention across genuinely meaningful intervals rather than within one conversation. Where the visits agree, the conclusion is fortified; where they diverge, that divergence is itself the finding, and it shapes when and whether execution should proceed.
Support that moves a borderline donor across the line
The Act requires all practicable steps before concluding incapacity, and at the borderline those steps frequently decide the outcome: the instrument explained one element at a time, plain-language summaries left between visits, familiar wording for unfamiliar concepts, the discussion held where the donor is comfortable and unhurried. A donor who fails a dense solicitor's explanation may demonstrate solid understanding of the same instrument presented in stages, and the report must show the staging was offered.
Progressive conditions: the closing window
Where the underlying condition is progressive, borderline today points one direction, and delay is the instrument's enemy. An early-stage dementia diagnosis is exactly when an LPA should be considered, whilst capacity remains, and families who wait for certainty usually wait until the option has gone, leaving deputyship as the longer, costlier substitute. The assessment's role in this window is to evidence the capacity that exists now, contemporaneously with execution, before the window closes.
Documenting the borderline conclusion
A borderline finding of capacity should be written expecting challenge: the donor's verbatim explanations of the instrument, the practicable steps and their effect, the timing choices and their justification, consistency across visits and an honest account of the difficulties observed alongside the abilities demonstrated. A report that concedes the effort whilst evidencing the understanding is far stronger than one that presents a struggling donor as untroubled, because the second collapses at the first contrary witness.
When the answer is not yet, or no
Sometimes the borderline resolves the other way: the donor cannot presently meet the test, or cannot meet it reliably enough for execution to be safe. Not yet has its own value, since treatment changes, recovery from acute illness or better support can reopen the question, and the assessment should say what might. Where the answer is no, the planning conversation turns to deputyship, and the assessment already conducted becomes the foundation of that application rather than wasted work.
Key takeaway
Borderline and fluctuating capacity are where LPA assessments matter most: the right threshold applied at the donor's best times, support given before conclusions are drawn, more than one occasion sampled where stability is in doubt and the finding documented for the challenge it may meet. Assess early in progressive conditions and honestly at the margin, and the donor's actual abilities, whatever they are, end up properly served.
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 Assessment to Grant Lasting Power of Attorney?
Beyond the draft LPA forms and medical records, evidence about the pattern of fluctuation matters: better and worse times of day, medication effects and recent examples of clear decision-making. The assessment is then scheduled for the window when the donor is at their best, and the report records why that timing was right.
When is a formal assessment for Mental Capacity Assessment to Grant Lasting Power of Attorney useful?
A formal assessment is strongly advisable wherever capacity is borderline or fluctuating, because the certificate provider's confirmation may later be questioned. A contemporaneous professional report defeats most later challenges before they start.
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.
Borderline capacity and an LPA to make?
Nellie Supports completes LPA donor capacity assessments across England and Wales, with certificate provider services available, a same working day response to every enquiry and every report peer reviewed before delivery. Call 0333 987 5118 or visit the LPA capacity assessment service page.