How Often Should Mental Capacity Be Reviewed

Created: 21 June 2026

A mental capacity assessment should never be treated as a one-off document that sits on file indefinitely. When people ask how often should mental capacity assessments be reviewed, the honest answer is that there is no single timetable that suits every person or every decision. The right review point depends on the person’s circumstances, the decision in question, the consequences of getting it wrong, and whether there has been any meaningful change since the assessment was completed.

That matters because capacity is both decision-specific and time-specific. A person may have capacity to make one decision but not another. They may also be able to make a decision at one point in time and lack capacity later, or regain it after a period of illness, treatment or support. In practice, this means reviews should be built around evidence and context rather than habit.

How often should mental capacity assessments be reviewed in practice?

The Mental Capacity Act 2005 does not set a fixed review period such as every six months or every year. In fact, it is not good practice to unnecessarily routinely assess a person's capacity to make decisions. Instead, the legal expectation is that assessments reflect the person’s current ability to make the specific decision when it needs to be made. If the decision is urgent and current, the assessment must be current too.

For a single, time-limited decision, a fresh review may not be needed once the decision has been made. For example, if an assessment concerns capacity to consent to a particular medical procedure on a specific date, its relevance may end once that decision is concluded. By contrast, if the issue concerns ongoing residence, care arrangements, contact, management of property and affairs, or litigation, review is often necessary because circumstances can and do change.

A sensible approach is to ask two questions. First, is this still the same decision in materially the same circumstances? Second, is there any reason to think the person’s ability to understand, retain, use or weigh information, or communicate their decision, has changed? If the answer to either question is yes, a review should be considered.

The main factors that affect review frequency

The nature of the impairment or disturbance is usually the starting point. Some conditions are stable and long-term. Others fluctuate from day to day or improve with treatment, support, recovery, or changes in environment. A person with delirium, acute mental ill health, medication changes, brain injury recovery, or a variable neurological presentation may need review much sooner than a person whose condition is well-established and life-long.

The decision itself also matters. The more serious, restrictive or far-reaching the decision, the more careful professionals should be about whether the assessment remains up to date. Decisions about where someone lives, whether they can manage substantial finances, whether they can conduct court proceedings, or whether they can consent to significant care or treatment usually require more careful review than lower-risk day-to-day matters.

Timing is another practical issue. An assessment completed several months ago may still be relevant if the person’s presentation and circumstances are unchanged. Equally, an assessment from last week may already be out of date if there has been a hospital admission, bereavement, safeguarding incident, medication change, relapse, or notable improvement.

Common triggers for a review

Rather than relying on a routine anniversary date, professionals and families are often better served by watching for clear triggers. A review is commonly needed where there has been a change in diagnosis, a deterioration or improvement in cognition, a significant mental health episode, a change in medication, or a move in living arrangements.

It may also be required where the person is now facing a different decision from the one originally assessed. Capacity to manage simple daily spending is not the same as capacity to manage a complex property transaction. Capacity to decide where to live is not the same as capacity to conduct litigation. Reusing an old assessment for a new issue is one of the most common weaknesses in practice.

Disagreement can also trigger reassessment. If family members, care providers, clinicians or legal representatives raise credible concerns that the earlier assessment no longer reflects the person’s current functioning, it is usually wise to review it. The same applies where a court, deputy, solicitor or local authority requires more current evidence.

When more frequent reviews are usually appropriate

Some situations call for closer monitoring. This is particularly true where capacity is known to fluctuate. A person may have better and worse periods linked to infection, fatigue, psychosis, substance use, mood disorder, or the effects of medication. In those cases, the question is not only how often the assessment should be reviewed, but whether the timing of the assessment captured the person at their best.

In rehabilitation settings, review may also need to be more frequent because ability can improve. Someone recovering from stroke, acquired brain injury or acute illness may develop greater understanding and decision-making ability over weeks or months. If professionals continue to rely on an early assessment without checking for progress, they risk making decisions on an outdated basis.

Equally, where there is a high level of restriction or legal consequence, current evidence carries more weight. If the assessment is being relied upon in Court of Protection proceedings, in care planning disputes, or for ongoing deputyship-related decisions, out of date evidence can quickly become a problem.

When a less frequent review may be reasonable

There are cases where review does not need to be constant. If a person has a severe and enduring impairment, the decision being considered is ongoing, and there is no indication of improvement or fluctuation, it may be proportionate to review only when circumstances change or at planned intervals agreed as part of good care governance.

Even then, caution is needed. Less frequent review does not mean no review. It means the evidence remains under consideration and can be revisited when needed. A file note saying an assessment was done years ago is rarely enough if someone is now making, or being prevented from making, a major life decision.

Good practice for professionals and families

The most defensible approach is to record not just the outcome of the assessment, but why that assessment is still being relied upon at a later date. If no review has been undertaken, there should be a clear reason. For example, there may have been no relevant change in presentation, no new decision to consider, and no challenge to the earlier evidence.

Where a review is undertaken, it should remain decision-specific. It should also show what support was offered to help the person decide for themselves. Capacity law is not only about identifying incapacity. It is also about taking practicable steps to maximise the person’s ability to make the decision.

For families, one practical point is worth stressing. A diagnosis alone does not decide capacity, and neither does age, unwise decision-making, or a general sense that someone is vulnerable. If concerns arise, the review should focus on the specific decision and the person’s functioning in relation to that decision at that time.

How often should mental capacity assessments be reviewed for court or formal proceedings?

Where an assessment will be used in formal proceedings or relied upon by solicitors, professional deputies, local authorities or the Court of Protection, timeliness becomes especially important. Decision-makers will usually want evidence that is current enough to reflect the person’s present circumstances and the precise issue before the court or tribunal.

There is still no universal expiry date. However, the older the assessment, the more likely it is that someone will ask whether it remains reliable. If the matter is contested, if the person’s condition fluctuates, or if there has been any significant development, an updated assessment is often the safer course.

This is one reason independent assessments are often requested in complex cases. Clear methodology, legally accurate reasoning and careful evidence gathering help reduce avoidable dispute. For clients and referrers working under pressure, that clarity can save time as well as reduce risk.

A practical rule of thumb

If there has been a change in the person, a change in the decision, or a change in the consequences, review the assessment. If nothing material has changed, the earlier assessment may still assist, but its continuing relevance should be actively considered rather than assumed.

That may feel less neat than a fixed schedule, but it is closer to what the law requires and what good practice demands. Mental capacity assessments are strongest when they reflect the real person, the real decision and the real circumstances at the point the decision must be made. If you need an assessment for a current legal, care or Court of Protection issue, an up-to-date and clearly reasoned report is usually the soundest place to start.

When the stakes are high, the right question is not whether enough time has passed since the last assessment. It is whether the evidence still truly reflects the person today.