Mental Capacity Act (Northern Ireland) 2016: A Care Staff Guide

Northern Ireland took a different route from the rest of the UK when it reformed its law on capacity. The Mental Capacity Act (Northern Ireland) 2016 is designed to bring mental capacity law and mental health law together in a single framework for people aged 16 and over. It is being brought into force in phases, so staff need to know what applies now, and what is still to come. This guide explains the main ideas and what care staff should do in practice.

It is general information, not legal advice. The Department of Health publishes updates on commencement, and the position may have moved on, so check the Department's website and your Trust's guidance. For England and Wales, see our guide to Mental Capacity Act and DoLS training.

Who the Act covers

The Act applies to people aged 16 and over in Northern Ireland. That is a significant difference from England and Wales, where the Mental Capacity Act 2005 also applies from 16, but mental health law is set out separately in the Mental Health Act. The Northern Ireland Act is intended eventually to replace the Mental Health (Northern Ireland) Order 1986, creating a single, fusion law approach.

Supported decision-making

The Department of Health states that the legislation is rooted in supported decision-making. Anyone considering whether a person lacks capacity must first consider and provide all practicable help and support to allow the person to make their own decision. In practice, staff should:

• give information in a format the person can understand
• choose the right time and place for the conversation
• involve people who know the person well
• try again if the person is tired, unwell or distressed

Only when all practicable help has been tried and the person still cannot decide should a lack of capacity be recorded.

How the Act is being phased in

According to the Department of Health, the Act is being rolled out in phases. The first phase, between October and December 2019, introduced the Deprivation of Liberty Safeguards, which took effect on 2 December 2019, along with provisions on research and on safeguards relating to money and valuables. During the transition, the Mental Health (Northern Ireland) Order 1986 and the Act operate in parallel. The Department also consulted in 2024 on commencing provisions relating to acts of restraint. Since commencement is ongoing, always check which parts are in force.

Deprivation of Liberty Safeguards

The Northern Ireland safeguards are a statutory process that applies when a person who lacks capacity is being deprived of their liberty in a setting such as a care home or hospital. As in England and Wales, staff need to recognise when care arrangements could amount to a deprivation of liberty and refer for authorisation. Our guide to Mental Capacity Act and DoLS training explains the wider concept, and the Supreme Court's 2026 ruling in England may be considered in discussions here, but the Northern Ireland legislation has its own tests and procedures, so do not assume English decisions apply directly.

Best interests

Where a person lacks capacity, decisions made for them must follow the Act's best interests framework, which looks at the person's wishes and feelings, their beliefs and values, and the views of people close to them. Our guide to best interests decision-making describes the English version of the approach, which is similar in spirit.

Advance planning

The Act includes mechanisms for planning ahead in case of future incapacity, which complement the existing options for lasting powers and advance decisions. Staff should encourage people to record their wishes early, and to share them with their family and care team.

Regulation and oversight

Registered services in Northern Ireland are regulated by the Regulation and Quality Improvement Authority, which expects staff to understand their legal duties. See our RQIA guide for more on inspections and standards.

What care staff should do

• Know what applies now. Check which provisions are in force and which still rely on the 1986 Order.
• Follow your Trust's procedures. Use the approved forms and referral routes.
• Assess capacity decision by decision. Record the support given and the outcome.
• Spot deprivation of liberty. Raise concerns early with your manager.
• Keep training up to date. Mixed old and new systems make regular refreshers essential.

Frequently asked questions

Does the Mental Capacity Act 2005 apply in Northern Ireland?

No. Northern Ireland has its own Act, the Mental Capacity Act (Northern Ireland) 2016.

Is the whole Act in force?

It is being phased in. The safeguards for deprivation of liberty began on 2 December 2019, and the Department of Health publishes updates on later phases.

Does the Act replace mental health law?

That is the intention, but until full commencement the Mental Health (Northern Ireland) Order 1986 continues to operate alongside it.

Where can teams find training?

See the CPD hub for professional development options for care and healthcare teams.

Learnsignal will update this guide as further provisions are commenced.