When difficult choices need to be made for someone who cannot decide for themselves, families often feel torn between heart and head. The Mental Capacity Act 2005 gives a clear framework for doing the right thing, in the right way, at the right time. This guide explains what “best interests” really means in practice, how it differs from assessing capacity, and how to move from confusion to a well recorded, lawful decision. Legislation.gov.uk opens in a new tab
Capacity first, then best interests
Start with the question, can the person make this specific decision now. Adults are presumed to have capacity, and every reasonable step should be taken to help them decide. Only if they lack capacity for this decision at this time do you move to a best interests process. In health and care, the four abilities test is a practical way to evidence capacity, understand, retain, weigh, and communicate a choice. Legislation.gov.uk opens in a new tab, SCIE opens in a new tab
Once lack of capacity is established for the decision in question, the best interests process applies. It is not a gut feeling, it is a statutory checklist and a transparent weighing of reasons that should be recorded. Legislation.gov.uk opens in a new tab, GOV.UK (pdf) opens in a new tab
What the best interests principle requires
Section 4 of the Act sets out the decision-maker’s duties. In plain terms, involve the person as far as possible, identify what really matters in the circumstances, take the person’s past and present wishes seriously, consult those involved in their care or welfare, avoid discrimination, pay special attention with life sustaining treatment, and choose the least restrictive option that achieves the aim. These are legal requirements, not optional extras. Legislation.gov.uk opens in a new tab
A short reminder from the BMA is useful here, “Best interests meetings are not a requirement of the MCA.” They can still be a helpful way to bring the right people together and to evidence a sound process for bigger decisions. British Medical Association (pdf) opens in a new tab
Who is the decision-maker
The decision-maker is the person responsible for the specific decision. In day to day care it is usually the person doing the act. For medical treatment it is normally the clinician proposing the treatment. For property and financial matters it may be an attorney under a registered Lasting Power of Attorney or a Court appointed deputy, acting within the scope of their authority. If there is no attorney or deputy, the person proposing the act must make the decision in line with the checklist, or seek the Court’s help if the decision is serious or disputed. SCIE opens in a new tab, GOV.UK opens in a new tab, nhs.uk opens in a new tab
Where the person has nobody appropriate to consult, an Independent Mental Capacity Advocate must be involved for serious medical treatment or a long term move, more than 28 days in hospital or more than 8 weeks in a care home. GOV.UK opens in a new tab
Expert emphasis on wishes and feelings
Courts have been clear that the person’s wishes and feelings carry real weight. As one leading summary of the Supreme Court’s judgment in Aintree v James puts it, “P’s own wishes are of central importance in best interests decision making.” This means decision-makers must make every effort to understand the person as an individual, their values, likes and dislikes, and then explain how those views influenced the outcome. 39 Essex Chambers opens in a new tab
Practical tips for families and professionals
Define one decision at a time. Vague questions create poor records. State the decision clearly, for example, “Residential placement at Brookside Care Home starting next month.” GOV.UK (pdf) opens in a new tab
Support decision making first. Consider timing, communication aids, and familiar environments. Record what support you tried before concluding lack of capacity. Legislation.gov.uk opens in a new tab
Check for existing authority. Look for a registered LPA or a deputy order. Confirm scope, for example, health and welfare versus property and financial affairs, and responsibilities to keep records. GOV.UK opens in a new tab
Consult properly. Speak with family, friends and carers who know the person well. Note who you spoke to, what they said, and how it informed the decision. GOV.UK (pdf) opens in a new tab
Weigh options in writing. Set out the benefits and burdens of each realistic option, including the least restrictive alternative that still achieves the goal. Legislation.gov.uk opens in a new tab
Record the decision and reasons. Good notes protect the person and the decision-maker. The Code of Practice recognises that protection from liability depends on a reasonable belief that capacity and best interests have been properly considered. GOV.UK (pdf) opens in a new tab
Know when to escalate. If disagreement is serious or the decision is finely balanced, consider a best interests meeting, seek a second opinion, or apply to the Court of Protection. British Medical Association (pdf) opens in a new tab, nhs.uk opens in a new tab
Real world examples, and how AJH would help in practice
A hospital discharge that feels unsafe. The ward proposes discharge tomorrow. The family believes the plan ignores risks at home. Ask for the capacity assessment for the discharge decision, request the best interests record that shows relevant circumstances and consultation, and if the record is thin, ask for a focused meeting to work through options. AJH can facilitate a proportionate best interests review and help the team capture a clear decision with reasons that everyone understands. GOV.UK (pdf) opens in a new tab
A move from home to a care home where siblings disagree. One sibling argues for a quick move, another wants more home care. Clarify who the decision-maker is for accommodation, then work methodically through the checklist, including the person’s known wishes and the least restrictive alternative. If positions remain entrenched, the Court of Protection can decide. AJH can structure the discussion, map options, and prepare a neutral record ready for escalation if needed. SCIE opens in a new tab, nhs.uk opens in a new tab
Feeding decisions in advanced dementia. Clinicians and family are considering clinically assisted nutrition versus comfort feeding. The decision-maker is the responsible clinician for treatment, who must take the person’s wishes and feelings seriously and document the balance of benefits and burdens. Meetings are not mandatory, yet they are often wise here. AJH can help gather evidence of the person’s values and ensure the written analysis is robust. 39 Essex Chambers opens in a new tab, British Medical Association (pdf) opens in a new tab
Nobody to consult, serious treatment planned. A person has no family or friends to be involved. For serious medical treatment or a long term move, an IMCA must be instructed and their views considered. AJH can check thresholds are met and liaise with the IMCA to keep the process moving. GOV.UK opens in a new tab
Restrictions that feel heavy handed. A care plan includes locked doors and one to one supervision. The decision-maker should ask whether the aim can be met in a less restrictive way while still being safe. If restrictions amount to a deprivation of liberty in a hospital or care home, separate DoLS authorisation is needed. AJH can help distinguish best interests decision-making from the safeguards that apply when liberty is restricted. SCIE opens in a new tab
How responsibility and protection work for front line staff
Section 5 of the Act gives protection from liability when someone provides care or treatment for a person who lacks capacity, provided they reasonably believe the person lacks capacity for the decision and that the act is in the person’s best interests. This reinforces why clear capacity assessments, proportionate consultation, and reasoned best interests notes matter. Legislation.gov.uk opens in a new tab, PMC opens in a new tab
The core message
Best interests is not a vote or a hunch. It is a careful, person centred process that respects rights, listens to what matters to the person, and records why one option is better than another. Do the capacity work first, involve the right people, weigh options openly, choose the least restrictive solution that actually works, and write it up clearly. That is how you protect the person, and yourself. Legislation.gov.uk opens in a new tab
Key sources
- Mental Capacity Act 2005, sections 1, 4, and 5. Legislation.gov.uk opens in a new tab
- MCA Code of Practice, best interests process and recording. GOV.UK (pdf) opens in a new tab
- Aintree University Hospitals NHS FT v James summary, weight to wishes and feelings. 39 Essex Chambers opens in a new tab
- SCIE, decision-maker and best interests in practice. SCIE opens in a new tab
- GOV.UK, IMCA guidance and triggers. GOV.UK opens in a new tab
- BMA, best interests toolkit, meetings as good practice not legal requirement. British Medical Association (pdf) opens in a new tab
- NHS, overview of MCA principles and the Court of Protection. nhs.uk opens in a new tab
Answers to Common Concerns About Best Interests
Who Has The Final Say In A Best Interests Decision?
The decision-maker is the person responsible for the specific act or treatment. This could be a doctor, a social worker, a care home manager, or an attorney or deputy if they have the right authority.
It is not decided by a vote, although others must be consulted.
Do We Always Need To Hold A Best Interests Meeting?
No, the law does not require a meeting for every decision. Meetings are often good practice when the decision is complex, serious, or disputed, but what matters most is that the process and reasoning are properly recorded.
How Much Weight Must Be Given To The Person’s Wishes And Feelings?
The person’s past and present wishes and values must be taken very seriously, and courts have confirmed they carry significant weight.
A best interests decision is not valid unless the person’s views have been considered and explained in the record.
What Happens If The Family Disagrees With Professionals?
Disagreements should first be explored through proper consultation and, if needed, a best interests meeting.
If the matter remains unresolved, the Court of Protection can make the final decision.
When Does An Independent Mental Capacity Advocate Have To Be Involved?
An IMCA must be instructed if the person has nobody appropriate to consult and the decision is about serious medical treatment or a long term move to hospital or care home.
Their role is to represent the person’s interests and ensure their rights are upheld.
Does Best Interests Apply If Capacity Fluctuates?
Yes, but timing is crucial. If capacity may return, and the decision is not urgent, it is usually better to wait so the person can decide for themselves.
What If The Least Restrictive Option Feels Less Safe?
The least restrictive option must still achieve the intended purpose. Safety and welfare come first, but decision-makers must explain why a more restrictive choice was necessary.
