Can You Write a Postnuptial Agreement Yourself In The UK?

By Updated on September 18, 2025

Table Of Contents

    Quick Summary: Postnuptial Agreements

    Post-nuptial agreements, entered into after marriage, provide clarity, certainty, and asset protection by defining how finances and assets will be divided in a separation, potentially saving time and legal costs in divorce proceedings. However, they are not strictly legally binding; a court may not uphold them if deemed unfair, outdated due to changed circumstances, or if they improperly address issues like child welfare.

    When considering drafting a postnuptial agreement in the UK, it is crucial to have a comprehensive understanding of the legalities and potential implications involved in the process.

    Although it is possible to draft a postnuptial agreement without solicitors, you should be aware of the risks and potential consequences of doing so.

    This article examines the feasibility of drafting a postnuptial agreement independently, the key factors to consider, as well as the potential advantages and drawbacks of doing so.

    While the prospect of creating a self-drafted postnuptial agreement may seem appealing initially, the practicality and challenges that come with this course of action often surpass any prospective benefits.

    We have written a guide to postnuptial agreements if you wish to learn more about their enforceability, what assets you can include, and so on.

    What is a Postnuptial Agreement?

    A postnuptial agreement, also commonly referred to as a post-marital agreement, is a legally binding contract entered into by a married couple after they have been married. Post-nuptial agreements outline how assets, debts, and other financial matters will be divided in the event of separation, divorce, or death.

    Post-nuptial agreements set out which assets will remain yours alone, protecting them from being shared during the marriage or divided if you divorce in the future.

    A postnuptial agreement is very similar to a prenuptial agreement and can cover a wide range of issues, including the division of property, spousal maintenance, child custody, and even pet ownership. A prenuptial agreement is signed before marriage, while a postnuptial agreement is signed after, and courts may scrutinise the latter more closely because the parties already have legal obligations to each other.

    It allows couples to have control over their financial future and provides clarity and certainty in case the relationship breaks down.

    However, it’s important to note that postnuptial agreements cannot override the courts’ jurisdiction in determining child custody and child support matters. Even if both spouses sign a postnuptial agreement stating that one parent will have sole custody, the court’s jurisdiction over child custody and child support means the judge can disregard that clause entirely.

    What Is The Process to Get a Postnuptial Agreement?

    Drafting a postnuptial agreement can be a complex task, but with the support of professional solicitors, it can be made easier.

    Here are some steps to follow when you are looking to get a postnuptial agreement:

    1. Legal Advice: Both parties should seek independent legal advice from family law solicitors to ensure that each person understands their rights and the implications of the agreement.
    2. Full Disclosure: Both parties must provide full and frank financial disclosure. This includes all assets, liabilities, income, and potential future earnings. The agreement is likely to be disregarded by a court if there has not been full disclosure.
    3. Draft The Agreement: One party’s solicitor typically drafts the postnuptial agreement. It should be fair and meet both parties’ needs. The agreement will detail how assets, property, debts, and other financial matters should be divided in the event of a breakup.
    4. Review & Negotiation: The other party and their solicitor will review the draft agreement. There may be negotiations and revisions to ensure the agreement is acceptable to both parties. If you’re acting without legal representation this stage is crucial.
    5. Signing The Agreement: Once both parties are satisfied with the terms of the postnuptial agreement, it is signed and witnessed. This typically requires the presence of a solicitor to confirm that both parties understand the agreement and are entering into it voluntarily.
    6. Storage: The original signed agreement should be stored safely, and both parties should keep copies. If you choose Divorce-Online to help you, our solicitors securely store a copy for you.

    In summary, the process of drafting a postnuptial agreement can be complex, and it’s crucial to get it right. Seeking legal advice can help ensure that your agreement is legally sound and provides the desired level of protection.

    Our Postnuptial Agreement Service for £899 is often over £1000 cheaper than most other options. If you have agreed on the terms with your husband or wife and want it documented in a legally enforceable document, our service is the ideal solution.

    Should I Consult with a Solicitor?

    If you are planning to write a postnuptial agreement, it is recommended that you consult with a solicitor throughout the process.

    An expert Postnuptial Agreement Solicitor specialising in family law can provide invaluable guidance and ensure that your agreement meets all legal requirements.

    A solicitor can help you understand the implications of the agreement, advise you on your rights and obligations, and identify any potential issues or areas of concern. They can also provide an objective perspective and help you negotiate the terms of the agreement with your spouse.

    If asset protection is the goal, enforceability is what makes it work, and independent legal advice from a solicitor is one of the strongest factors a court will weigh.

    Furthermore, a solicitor can review and finalise the agreement to ensure it is legally binding and enforceable. Knowing that your agreement will hold up in court if necessary can provide peace of mind.

    While engaging a solicitor may involve additional costs, it is a worthwhile investment to ensure that your postnuptial agreement is comprehensive, fair, and legally sound.

    Is a Self-Drafted Postnuptial Agreement Enforceable?

    A self-drafted postnuptial agreement faces a higher risk of failing the fairness test, and because the agreement remains subject to the court’s jurisdiction, the judge can set it aside if it does not meet that standard.

    To enforce a self-drafted postnuptial agreement, it must meet the legal requirements outlined earlier in this article.

    It’s crucial to ensure that both parties have entered into the agreement voluntarily, have sought independent legal advice, and have provided full and frank financial disclosure.

    In the event of a dispute, the court will consider various factors, including the fairness of the agreement, the circumstances surrounding its creation, and any changes in circumstances since its signing.

    Seeking legal advice and having a solicitor review your agreement can help strengthen its enforceability and protect your interests.

    Frequently Asked Questions…

    When might I actually need a postnuptial agreement?

    Postnuptial agreements are useful in a range of situations beyond high-net-worth divorces. For example, a couple married for five years might use a postnuptial agreement to specify that a business one spouse founded during the marriage remains their separate property if they later divorce.

    Other common scenarios include one spouse receiving a significant inheritance, a change in career that affects future earning potential, or simply wanting to formalise financial expectations after years of informal arrangements.

    Can a court overturn a postnuptial agreement even if both spouses signed it?

    Yes. Even if both spouses sign a postnuptial agreement and have it witnessed, a judge still has the power to set it aside if the court decides the terms are unfair or that one party was pressured into signing.

    Fairness is assessed on the specifics of the case: if a self-drafted agreement leaves one spouse with no housing and minimal income while the other retains all assets, a court is likely to find the agreement unfair and refuse to uphold it. This is one of the main risks of drafting an agreement without professional legal guidance.

    What’s the difference between a prenup and a postnup, and does it affect enforceability?

    A prenuptial agreement is signed before the wedding, while a postnuptial agreement is signed after the marriage has begun, and this timing difference can affect how much weight a court gives each document.

    Because postnuptial agreements are made once the couple already has legal obligations to one another, courts may look more closely at the circumstances surrounding the signing, including whether both parties had independent legal advice and full financial disclosure.

    Does a postnuptial agreement guarantee custody arrangements for children?

    No. Even if both spouses sign a postnuptial agreement stating that one parent will have sole custody, the court’s jurisdiction over child custody and child support means the judge can disregard that clause entirely. Family courts in England and Wales always retain the authority to decide arrangements based on the child’s best interests, regardless of what the agreement says.

    Why does having a solicitor matter if we’ve already agreed on the terms ourselves?

    If asset protection is the main goal, enforceability is what will make your postnuptial agreement work, and independent legal advice from a solicitor is one of the strongest factors a court will weigh up.

    Even where both spouses are in full agreement, a solicitor ensures the agreement is properly drafted, that both parties have had a fair opportunity to understand its implications, and that full financial disclosure has taken place. All of these actions materially strengthen the agreement’s chances of being upheld if challenged in court.

    Common Misconceptions About Postnuptial Agreements

    There are several common misconceptions surrounding postnuptial agreements that are important to address. These include:

    1. Postnuptial agreements are only for the wealthy: While postnuptial agreements are often associated with high-net-worth individuals, they can be beneficial for couples of all financial backgrounds. It’s not just about protecting significant assets; it’s about establishing clarity and fairness in the event of a relationship breakdown.
    2. Postnuptial agreements are unromantic: While discussing and negotiating a postnuptial agreement may not be the most romantic aspect of marriage, it can actually strengthen your relationship. By openly discussing financial matters and addressing potential future scenarios, you can build trust and ensure that both parties are on the same page.
    3. Postnuptial agreements are a sign of mistrust: Creating a postnuptial agreement does not imply a lack of trust or a belief that the marriage will fail. Rather, it is a proactive step towards protecting the interests of both parties and providing financial security.
    4. Postnuptial agreements are not legally binding: While postnuptial agreements are not automatically legally binding in the UK, they can be upheld by the courts if certain legal requirements are met. Seeking legal advice and ensuring that your agreement meets the necessary criteria increases the likelihood of its enforceability.

    It’s important to recognise that postnuptial agreements serve a practical purpose and can provide significant benefits for couples in various circumstances.

    How Can Divorce-Online Help Me?

    A postnuptial agreement can provide financial security, clarity, and peace of mind for both parties, but it must meet the legal requirements and address all necessary elements.

    By understanding the legal complexities, considering the advantages and disadvantages, and seeking professional guidance, you can create a postnuptial agreement that protects your interests and provides a solid foundation for your future.

    You don’t need to spend thousands with local solicitors to obtain a professionally drafted post-nuptial agreement. Our service for £899 is a fixed fee, it covers both parties and includes VAT. Additionally, it includes legal advice for one party.

    Postnuptial Agreement Service For £899

    Obtain a professionally drafted Post-nuptial Agreement for just £899 without needing to visit our offices or attend court. Everything can be completed online by qualified family solicitors.

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    Georgina Hitchins BA (HONS)
    Written by:

    Georgina Hitchins BA (HONS)

    Solicitor

    Georgina Hitchins is a family law solicitor at OLS Solicitors, specialising in financial consent orders, prenuptial agreements, and postnuptial agreements. She provides clear, practical legal guidance to help clients put legally binding financial arrangements in place with confidence.