Mental Capacity Assessment for Signing a Prenuptial Agreement

The assessment is the same rigorous process whoever instructs it. What changes is what you need to know first.

I am supporting a family member

An agreement can be difficult to discuss when there are family expectations, a wedding date or concern about someone’s health. Tell us what the person is being asked to sign and why capacity is in question. We explain the assessment without assuming that signing or refusing is the preferred outcome.

I am instructing as a professional

Please provide the draft agreement, the intended signing date and the legal advice relevant to the capacity question. Each party’s independent legal advice, disclosure and the circumstances of agreement remain matters for their lawyers. We confirm the assessment and report scope separately.

An independent social-work practice with an employed professional team and peer-reviewed reporting. Explore our mental capacity assessment services to find the right starting point.

Read how we evidence our scale on our Permanent Team, National Scale page, and how reports are governed and peer reviewed in our Professional Standards.

What is a mental capacity assessment?

A capacity assessment answers a particular question at the relevant time. We help the person take part and consider the decision they face. Under the Mental Capacity Act, any inability to decide must be caused by an impairment or disturbance of mind or brain.

The decision concerns entering into a prenuptial or postnuptial agreement: whether the person understands what they are agreeing to give up or keep if the marriage ends.

This is a more demanding decision than the decision to marry. The threshold for capacity to marry is deliberately low; understanding a financial agreement that binds you on divorce is not.

A solicitor may request evidence because of difficulty understanding the proposed terms, significant cognitive change or a concern about how instructions were reached. The assessment is tailored to the agreement. A forthcoming wedding, an unequal financial position or family pressure should be identified, without treating any of them as proof of incapacity.

Your report explains the question, relevant evidence, support provided and conclusion, with clear reasoning and any limitations. Court-specific requirements are agreed before instruction.

A significant asset imbalance

One party is bringing substantially more into the marriage and the agreement is protecting it.

A diagnosis on one side

One party has a condition that could later be used to say they did not understand what they signed.

A later-life marriage

The marriage follows a bereavement or divorce and adult children have an interest in the outcome.

Concerns about pressure

There are concerns that one party is being pressed to sign, or is signing close to the wedding.

A solicitor requires evidence

The firm advising wants independent evidence of capacity before the agreement is executed.

An agreement is being challenged

An existing nuptial agreement is disputed and capacity at signing is in issue.

We consider the actual document and the information the person needs to decide about it. This includes the purpose of the agreement, the broad assets and interests concerned, the proposed commitments and the consequences of signing or declining. Relevant legal advice needs to be explained accessibly before their ability to use it can be assessed.

What the agreement is for, and that it is intended to govern what happens if the marriage ends

In broad terms what each of them owns, and what the agreement does with it

What they would be giving up compared with what a court might otherwise award them

That the agreement is intended to bind them, and is likely to be upheld if it was entered into freely

That they are entitled to their own independent legal advice before signing

That they can negotiate the terms, delay signing, or decline to sign at all

An opinion on capacity does not establish that the person is acting freely or that a court will give effect to the agreement. Pressure, disclosure, independent advice and legal enforceability raise separate questions. We record concerns within the assessment while keeping the limits of our role clear.

A person is entitled to sign an agreement that is not in their financial interest, if they understand what they are doing. The issue is whether the person can make the relevant decision, not whether it is a good deal.

A Prenuptial Agreement capacity assessment applies the Mental Capacity Act 2005 to the specific decision. The question is whether, at the time the decision needs to be made, the person can:

A person may have capacity for some decisions but not others. Prenuptial Agreement capacity must therefore be assessed as its own decision. Under the Mental Capacity Act, an inability to make this decision must result from an impairment of, or disturbance in, the functioning of the mind or brain. We explain that causal link using the evidence at the relevant time, after taking all practicable steps to support the person. A diagnosis or an unwise decision alone does not establish a lack of capacity.

Framework: Mental Capacity Act 2005 sections 1–3 and the Code of Practice, with the relevant contractual question and legal instructions identified for the proposed agreement. Capacity to enter marriage is a separate question.

Read the supporting guidance

Understand the information relevant to the decision about Prenuptial Agreement

Retain that information long enough to make the decision

Use or weigh that information as part of making the decision

Communicate their decision by any means

Initial enquiry and triage

Tell us the decision, who needs the report and any deadline. We discuss the person’s needs and confirm the right service before booking.

Quotation and booking

Receive a written scope, fee including applicable VAT and agreed timetable. Travel and any additional work are explained before you proceed.

Assessment appointment

The assessor meets the person in an appropriate setting, explains the relevant information clearly and provides the support they need to take part.

Report preparation and peer review

The report explains the evidence, reasoning and conclusion. A second professional reviews it before delivery. Any court-specific requirements are agreed at instruction.

Secure delivery

Receive the report securely, with its findings and any limitations clearly explained. We respond to clarification requests within the agreed scope.

We review the documents relevant to the question and explain how to share them securely. The report distinguishes records, the person’s own responses and information supplied by others.

Medical records

GP summaries, hospital letters and any information about diagnosis or treatment that bears on decision-making.

The draft agreement

The terms actually proposed, so the assessment addresses this agreement rather than nuptial agreements in general.

Financial disclosure

The broad asset picture on both sides, without which the person cannot weigh what they are agreeing to.

Previous assessments

Earlier capacity assessments, cognitive testing or social care assessments, where these exist.

Care and support records

Care plans and daily notes that describe the person's presentation and any fluctuation over time.

Accounts from people who know the person

Observations from family, friends and professionals about the person's understanding and who has been involved.

A well-reasoned assessment explains how the conclusion has been reached, rather than simply stating an outcome, tied to the actual decision in issue.

The specific decision being assessed

Whether the person was given the relevant information in a way they can understand

Whether they understand the information relevant to the decision

Whether they can retain that information long enough to decide

Whether they can use or weigh the relevant information

Whether they can communicate their decision by any means

Whether any inability is because of an impairment or disturbance of the mind or brain

The support provided, the person's views, and the reasoning behind the conclusion

The assessment and fee on this page cover our standard service, which is suitable for most instructions. If your case is more complex, high-risk or potentially contested, additional evidence may help. We can advise on the appropriate scope before booking.

Explore Advanced and Enhanced assessments

£720 including VAT

Standard fee. Displayed service fees include VAT. Travel costs are confirmed separately. If your case needs additional evidence, follow the Advanced and Enhanced assessments link below to explore the scope and fees. Travel time is charged at £48 per hour including VAT (£40 excluding VAT) where applicable and is confirmed before booking.

Assessment appointment options

We arrange a face-to-face or remote assessment where suitable for the person and the decision being considered. For prenuptial agreement decisions, the format must allow the assessor to explore the person's understanding clearly and respectfully. The appointment can usually take place at home, in a care home, in supported living, in hospital where appropriate, at a professional location or by video where this is clinically and legally suitable.

Gentle, professional assessment

The assessment is carried out calmly, with attention to communication, anxiety, fatigue and the person's preferred way of engaging. The person is not treated as a problem to be tested, but as the central decision-maker wherever possible. For prenuptial agreement decisions, the assessor may need to explore sensitive personal information without turning the appointment into an interrogation or imposing personal values.

Decision-specific approach

The report addresses the person’s capacity to decide about this agreement, at the relevant time. It identifies the terms and consequences considered, the information and advice provided, the support offered and the reasoning behind the opinion. It does not give a blanket finding about every financial or relationship decision.

Mental Capacity Act compliant

The assessment applies the Mental Capacity Act 2005 framework, including the presumption of capacity, practicable steps, the functional test and the need to avoid treating an unwise decision as incapacity. For this decision, the assessor considers whether any impairment or disturbance in the functioning of the mind or brain causes the person to be unable to understand, retain, use or weigh relevant information, or communicate their decision.

Relevant information for prenuptial agreement

The person needs an accessible explanation of what the proposed agreement would do in their circumstances. We consider how they understand the choices and weigh the relevant consequences, rather than test their ability to recite legal language. We also identify any gaps in the information needed to reach a supported opinion.

Written capacity report

Following the assessment, we prepare a written mental capacity report setting out the evidence, the MCA test, the decision assessed and the reasons for the opinion. The report can be prepared for families, solicitors, deputies, local authorities, safeguarding professionals or Court of Protection use depending on the instruction and the purpose of the assessment.

Prenuptial agreement before a proposed marriage

An assessment may be needed where a person wishes to marry and sign a prenuptial agreement but there is concern about whether they understand the agreement as a separate financial decision.

Pressure, family wealth or inheritance concerns

Where wealth protection, inheritance planning or family pressure is present, a clear assessment can help show whether the person can understand and weigh the agreement for themselves.

Solicitor concern about valid instructions

A solicitor may request a capacity report where the client appears vulnerable, inconsistent, confused or reliant on another person when considering the agreement.

This is an illustrative example. It does not describe any individual client.

The value of the service lies in the assessment and the explanation behind it: the relevant expertise, a supported process, careful use of records and a written opinion that others can examine. Our role is to provide independent evidence within the agreed instruction.

For families

Know the work, cost and timetable before booking. We agree the appointment arrangements around the person’s needs and explain what the completed report will include.

For professionals

An employed professional team, with relevant expertise and a second professional reviewing the report. We agree the appropriate assessor and written output for your instruction.

Decision-specific, not generic

Focused on the exact decision in issue and the information relevant to it, not a broad opinion about capacity overall.

Court-ready reporting

Reports structured for solicitors, the Court of Protection and other professionals who need to rely on them.

Therapeutic assessment interviews

A calm, supportive conversation that helps the person engage as fully as possible.

Nationwide coverage

A permanent team covering England and Wales, in person or by video where appropriate.

Peer reviewed as standard

Every report is reviewed by a second qualified professional before it is issued.

Employed, not outsourced

A permanent full-time team, not an ad hoc panel of associates.

How quickly can a prenuptial agreement capacity assessment be arranged?

Timeframes depend on location, urgency, assessor availability and the complexity of the instruction. Once we understand the decision, evidence and setting, we can provide a clear quotation and proposed appointment options.

How much does a prenuptial agreement capacity assessment cost?

Fees depend on the number of decisions, complexity, travel and reporting requirements. Please see https://www.nelliesupports.com/prices or contact us for a quotation based on the specific instruction.

Can the assessment be completed remotely?

Sometimes. Remote assessment may be suitable where the person can engage effectively by video and the decision can be assessed safely that way. For sensitive or complex prenuptial agreement matters, face-to-face assessment may be more appropriate.

What happens if the person refuses to take part?

Please tell us if the person is reluctant or does not wish to take part. We consider whether better explanation, a different setting or other support could help. Refusal alone is not evidence of incapacity, and an assessment must not be presented as complete when the necessary evidence could not be obtained. Any authority to proceed requires separate consideration.

Is capacity to sign a prenuptial agreement the same as capacity to marry?

No. A person may understand the nature of marriage but still need separate assessment of whether they can understand and weigh the financial and legal implications of a prenuptial agreement. These are distinct decisions.

What if the assessment does not reach the conclusion we hoped for?

Our opinion follows the evidence. We explain the findings and any uncertainty, whether or not the conclusion matches the initial concern. Paying for an assessment does not buy a preferred outcome.

Mental Capacity Act 2005 explained

A plain English guide to the key MCA principles and the two-stage capacity test.

What is relevant information in a capacity assessment?

Explains why each capacity decision must be assessed using information specific to that decision.

How to prepare for a mental capacity assessment

Practical guidance on documents, context and support before an assessment appointment.

Remote versus face-to-face capacity assessments

Explains when remote assessment may be suitable and when face-to-face assessment may be preferable.

What makes a capacity report court-ready?

Explains the features of a clear, reasoned and decision-specific report.

If a different decision needs to be assessed, our team can help across the full range of mental capacity assessments.

We provide independent assessment and professional evidence. Legal advice and court applications remain with the relevant legal adviser.

Contact Nellie Supports to discuss a prenuptial agreement capacity assessment. We will confirm the decision, the evidence needed, the likely timescale and whether a face-to-face or remote assessment is suitable.

Reports are typically delivered within 5 working days of the assessment visit.