Supported decision-making and mental capacity
Support with decision-making helps a person make their own choices; understand capacity, unwise decisions and the different UK legal frameworks.
How this guide was prepared
Purpose: rights guidance · Level: detailed
Checked by: Does Your Duck Quack. Sources are linked below; seek professional advice for individual circumstances.
The short answer
What to do first
Support with decision-making helps a person make their own choices; understand capacity, unwise decisions and the different UK legal frameworks.
Start here: Do not assume age, disability, dementia, a mental-health condition or an unusual choice proves incapacity. Start by asking the person directly and finding what communication support or extra time would help them decide.
Visual guides
See the decision at a glance
- Start with the personExplain the specific decision in an accessible way, at the best time and place, with preferred communication support.
- Offer practical supportUse plain language, pictures, interpreters, sensory aids, extra time and trusted people chosen by the person.
- Do not assume incapacityAn unwise choice or a diagnosis alone does not establish lack of capacity; follow the law for the relevant UK nation.
- Record the processDocument the decision, support tried, the person’s wishes and any formal assessment or authority relied on.
Scope of this guide
This guide helps you understand the options and questions to ask. It is not personal medical, legal or financial advice. Check the official sources for your nation and seek qualified help for high-stakes decisions.
Who this guide is for
People whose choices are being questioned, and family members or professionals who want to support a decision respectfully.
A person should be involved in decisions about their life as fully as possible. Needing more time, help to communicate or information in a different format does not mean someone lacks capacity. Capacity is not a general label: the relevant question is whether the person can make this particular decision at this time, after practical support. This guide gives general information; seek specialist legal or advocacy help if rights are disputed.
What to prepare and ask for
1. Start with the presumption that the person can decide
Do not assume age, disability, dementia, a mental-health condition or an unusual choice proves incapacity. Start by asking the person directly and finding what communication support or extra time would help them decide.
2. Make the decision easier to understand
Choose a calm time and familiar place. Break information into smaller points, use pictures or written prompts if helpful, and explain likely consequences without pressure.
3. Apply the decision-specific test carefully
In England and Wales, the Mental Capacity Act asks whether an impairment or disturbance of mind or brain means the person cannot understand, retain, use or weigh relevant information, or communicate a decision.
4. Respect a decision others consider unwise
Adults are allowed to choose options other people dislike, including choices that carry risk. Disagreement, eccentricity or making the same choice repeatedly is not by itself proof of incapacity.
5. If capacity is absent, decide lawfully and narrowly
Where the Mental Capacity Act applies and a person cannot make the particular decision despite support, the decision-maker must act in their best interests and consider their wishes, values, relationships and participation.
6. Find the right framework and advocate
England and Wales use the Mental Capacity Act 2005. Scotland uses the Adults with Incapacity (Scotland) Act 2000. Northern Ireland’s 2016 Act is only partially commenced, so ask a local solicitor, trust or advocate which rules apply.
Evidence and questions
- Decision precisely defined
- Communication support provided
- Diagnosis not treated as proof
- Wishes and values recorded
- Legal framework for nation checked
- Review or challenge route known
- The person has time and information in an accessible form.
Common questions
What does supported decision-making mean?
It means helping a person understand, consider and communicate a choice without taking control away from them. Support might include extra time, simpler explanations, pictures, an interpreter, hearing support or a trusted person chosen by them. The aim is to make the person’s own decision possible. Only if they still cannot make that specific decision should a substitute decision process be considered under the law that applies.
Can someone lack capacity for one decision but not another?
Yes. Capacity is assessed for the particular decision at the relevant time, not as a permanent label across every part of life. Someone might need support with a complex financial choice but decide independently what to eat or where to spend the afternoon. Health, fatigue, distress and communication barriers can affect a decision, so provide appropriate support and reassess if circumstances change.
Is an unwise decision proof that a person lacks capacity?
No. A person may choose an option that others consider risky or unwise and still have capacity. The important questions are whether they can understand, retain, use or weigh the relevant information and communicate a choice under the law that applies. Explore coercion, unmet needs and whether information was accessible, but do not substitute someone else’s preferences simply because they disagree.
What is different in Northern Ireland?
The Mental Capacity Act (NI) 2016 is being commenced in phases. Department of Health guidance describes the current commencement as partial, initially covering areas such as deprivation of liberty, research, and money and valuables in specified settings. It has not fully replaced existing frameworks. If a decision is significant or disputed, ask a Northern Ireland solicitor, trust or advocacy service which rules apply rather than using an England-and-Wales form or assumption.
Before you act
Write down the outcome you want, the names and dates involved, and the evidence or documents you already have. Ask for important decisions, costs and next steps in writing. If information is unclear, ask which nation’s rules are being used and when the decision will be reviewed.
If there is a delay or disagreement
Keep a short factual record of calls, letters and missed actions. Ask for the responsible person, the written reasons, the complaints or review route and any deadline. Immediate health or safety risks should be escalated separately rather than waiting for a routine complaint.
Differences across the UK
England and Wales use the Mental Capacity Act 2005; Scotland and Northern Ireland have distinct capacity legislation and terminology. The capacity test, decision-making powers and safeguards are not identical across the UK. England and Wales share the Mental Capacity Act 2005. Scotland applies the Adults with Incapacity (Scotland) Act 2000. Northern Ireland is implementing the Mental Capacity Act (NI) 2016 in phases; official guidance says it is partially commenced. Cross-border cases and disputes need nation-specific advice. A person may also be entitled to independent advocacy under particular statutory conditions.
Primary sources
The publisher checked this guide against the 6 official sources below. This is an editorial source check, not approval by a clinician, lawyer or benefits adviser.
- NICE: Decision-making and mental capacity
- GOV.UK: Mental Capacity Act Code of Practice
- mygov.scot: Adults with Incapacity Act
- Scottish Government: Adults with Incapacity guidance
- Department of Health Northern Ireland: Mental Capacity Act legislation
- Department of Health Northern Ireland: Mental Capacity Act background
Related guides
- Helping a parent without taking over
- Living wills: advance decisions and advance statements
- Ageing with a learning disability
- Independent advocacy across the UK: how to get support
Editorial note: By Does Your Duck Quack.