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A well drafted postnuptial agreement gives married couples clarity about finances and reduces the risk of costly disputes if the relationship breaks down. In England and Wales courts will give a postnuptial agreement weight where parties entered it freely with full financial disclosure and independent legal advice. Draft clauses that read clearly, allocate risk sensibly and anticipate future change. This guide lists practical clauses to include, explains why each matters, suggests drafting wording principles and offers a checklist to help solicitors and couples create balanced, enforceable agreements.
Why clause choice matters
Clauses translate broad intentions into enforceable steps. Vague or missing clauses create ambiguity and litigation. Courts examine content and process, so include objective mechanisms, evidence of disclosure and fallback rules that preserve fairness. Clear drafting also speeds negotiation, reduces valuation disputes and helps mediators or judges apply the parties’ intentions if they later disagree.
Core clauses every postnuptial agreement should include
1. Recitals and background facts
Purpose
Set out a plain English recital that identifies the parties, the marriage date and the factual background that explains why the agreement exists.
Why include it
Recitals frame the parties’ intentions and provide context for ambiguous terms. Courts review recitals to understand the negotiating position.
Drafting tip
Keep recitals concise and factual. Avoid emotive language or statements that imply coercion.
2. Definitions and interpretation
Purpose
Define key terms such as separate property, matrimonial property, net income, pension rights, business interests and valuation date.
Why include it
Precise definitions reduce argument about scope and meaning.
Drafting tip
Use consistent terminology across clauses and refer back to defined terms rather than repeating descriptions.
3. Scope and purpose clause
Purpose
State what the agreement covers and what it does not, and confirm it does not attempt to oust the court’s jurisdiction on children’s welfare.
Why include it
Courts will not enforce clauses that attempt to bind a child’s legal rights. A scope clause clarifies parties’ intentions and preserves flexibility.
Drafting tip
List inclusions and exclusions briefly and refer to attached schedules for detailed asset lists.
4. Full financial disclosure clause
Purpose
Record that both parties exchanged full and frank disclosure and identify the documents exchanged.
Why include it
Disclosure supports informed consent and strengthens enforceability.
Drafting tip
Attach a disclosure schedule as an exhibit and state that the schedules formed part of the agreement at signing.
5. Asset classification clause
Purpose
State which assets remain separate and which count as matrimonial property. Include rules for co‑mingling and conversion.
Why include it
Clear classification prevents disputes about whether specific property falls inside the matrimonial pot.
Drafting tip
Attach detailed schedules with property addresses company numbers wallet addresses and pension scheme identifiers.
6. Valuation clause
Purpose
Set methods for valuing businesses, property, pensions and volatile assets such as crypto.
Why include it
Disputed valuations create lengthy expert contests. Agreed methods and tie‑breaker rules reduce that risk.
Drafting tip
Specify valuation date, acceptable methodologies, a panel of valuers and a dispute resolution rule if valuers disagree by a material margin.
7. Treatment of the family home and occupancy rights
Purpose
Explain occupation rights, contribution accounting, and distribution on sale or separation.
Why include it
The family home usually drives most disputes. Clarify who lives where and how proceeds divide.
Drafting tip
Consider interim occupation arrangements and mechanisms for reimbursing one party for mortgage payments or improvements.
8. Pensions clause
Purpose
Set out pension sharing or offsetting arrangements and actuarial requirements for defined benefit schemes.
Why include it
Pensions often represent long term wealth; omission creates unfairness later.
Drafting tip
Name acceptable actuaries and agree valuation dates and methods for CETVs or capitalised values.
9. Business protection clause
Purpose
Protect business continuity by ring‑fencing pre‑marriage ownership, setting growth sharing rules, and creating buyout mechanisms.
Why include it
Businesses require governance and funding rules to avoid forced sales or operational disruption.
Drafting tip
Cross‑reference shareholder agreements and include pre‑emption and voting restrictions for transfers on separation.
10. Inheritance and gifts clause
Purpose
Confirm how current or future inheritances and family gifts will be treated and include co‑mingling rules.
Why include it
Families often want to preserve inheritances for children or other beneficiaries.
Drafting tip
Consider trusts or family investment companies to protect inheritance while addressing tax consequences.
11. Debts and liabilities clause
Purpose
Allocate responsibility for pre‑existing debts and set rules for new liabilities incurred during marriage.
Why include it
Debt allocation affects net asset calculations and exposure to creditors.
Drafting tip
State who pays what and how joint borrowing will be handled, and require prompt disclosure of new material liabilities.
12. Spousal maintenance and financial support clause
Purpose
Record agreed maintenance formulas, caps or opt‑out provisions while recognising court discretion on need.
Why include it
Courts will not enforce terms that leave a party in real need. A balanced clause reduces challenge risk.
Drafting tip
Use objective measures such as percentage of net income income bands or fixed transition payments, and include review triggers.
13. Children and childcare provision clause
Purpose
Set out parents’ intentions on interim support, education funding and capital provision for children while reserving court jurisdiction.
Why include it
You can document intentions but not bind the court. Use trusts or protected accounts for capital sums.
Drafting tip
Frame clauses as statements of intent with review triggers tied to schooling milestones or family events.
14. Review, update and sunset clause
Purpose
Provide for periodic reviews or automatic changes after events such as birth of children sale of a business or inheritance.
Why include it
Life changes can render terms obsolete. Built‑in reviews show foresight and fairness.
Drafting tip
Include clear trigger events and a timetable for renegotiation or defined conversions of terms after a set period.
15. Dispute resolution clause
Purpose
Require negotiation mediation then arbitration for financial disputes and reserve court access for urgent child matters.
Why include it
Layered dispute resolution reduces litigation, costs and publicity.
Drafting tip
Specify governing arbitration rules, seat and law, and preserve the right to seek injunctive relief in court for urgent risks.
16. Interim governance and asset preservation clause
Purpose
Set temporary controls on asset transfers, withdrawals and business decisions during disputes.
Why include it
Preventing dissipation protects the asset pool and reduces emergency litigation.
Drafting tip
Consider requiring joint consent for transfers above a threshold and appoint an independent custodian for liquid assets if disagreement arises.
17. Tax and costs allocation clause
Purpose
Allocate responsibility for tax liabilities arising from transfers and state who pays legal and valuation costs.
Why include it
Tax events can alter net outcomes dramatically. Clear allocation prevents later argument.
Drafting tip
Model likely tax impacts and include a tax gross‑up or netting mechanism where appropriate.
18. Confidentiality and non‑disparagement clause
Purpose
Protect private financial information and business reputation by limiting disclosure and public commentary.
Why include it
Family disputes can harm reputations and commercial relationships.
Drafting tip
Balance confidentiality with the need to disclose to legal advisers, trustees or courts and include measured non‑disparagement obligations.
19. Execution, certificates and witnesses clause
Purpose
Record details of signing, witnesses and solicitor certificates confirming independent advice.
Why include it
Formal evidence of advice and correct execution strengthens enforceability.
Drafting tip
Attach solicitor certificates and include a schedule listing witnesses, dates and locations of signing.
20. Ancillary schedules and exhibits
Purpose
Attach detailed asset lists, valuations, corporate documents, pension statements and legal opinions.
Why include it
Schedules provide the evidential foundation for the agreement and show what the parties knew at signing.
Drafting tip
Number exhibits, cross‑reference clauses and keep electronic and paper copies securely stored.
Drafting principles to improve enforceability
– Use plain, precise language: avoid ambiguous terms and legalese that courts may interpret unpredictably.
– Prefer objective formulas: percentages, income bands and fixed dates beat subjective terms.
– Provide fallback provisions: include reasonable safety nets such as limited maintenance or occupation rights so a spouse does not face sudden hardship.
– Document process thoroughly: keep dated drafts, solicitor letters, valuation reports and meeting notes to show informed voluntary negotiation.
– Allow adequate time: avoid signing under pressure and ensure each party has time to consider advice.
– Update when circumstances change: include review triggers and repeat disclosure and advice for any material amendment.
Practical checklist before signing a postnuptial agreement
– ensure both parties obtain independent legal advice and retain solicitor certificates
– exchange full documented disclosure covering assets liabilities pensions businesses and contingent rights
– attach detailed schedules with identifying information and recent valuations where needed
– include valuation methods and name acceptable valuers with a tie‑breaker rule
– set clear maintenance formulas or fallback provisions for fairness
– include dispute resolution with mediation and arbitration steps and a court carve‑out for urgent child welfare issues
– record signing formalities, witnesses and dates and store originals with solicitors
– plan periodic reviews and include trigger events such as inheritance business sales or births
Conclusion
A practical postnuptial agreement blends clarity, fairness and procedural rigour. Include clauses that define scope, classify assets, set valuation methods, address pensions and businesses, and provide dispute resolution and review mechanisms. Draft objectively, attach detailed schedules and document the negotiation thoroughly to maximise the agreement’s persuasive force in English and Welsh courts. Work with experienced family law solicitors like us, valuers and tax advisers to tailor clauses to your circumstances and to preserve both parties’ interests while reducing the risk of future litigation.
At Alexander JLO we have many years of experience of dealing with all aspects of family law and will be happy to discuss your case in a free no obligation consultation. Why not call us on +44 (0)20 7537 7000, email us at info@london-law.co.uk or get in touch via the contact us button and see what we can do for you?
This blog was prepared by Peter Johnson on 14th November 2025 and is correct at the time of going to press. With over forty years of experience in almost all areas of law Peter is happy to assist with any legal issue that you have. He is widely regarded as one of London’s leading divorce lawyers. His profile on the independent Review Solicitor website can be found Here. To follow up on any of the above please contact Guy Wilton of our family department. Guy has wide experience of acting for the firm’s clients, their family and their businesses. Guy’s experience as a lawyer started in the Northern and Welsh Circuits, including the Liverpool Courts, where he represented numerous clients after being called to the Bar, before opting to join Alexander JLO in 2017 and qualifying as a solicitor in 2024. He is a highly experienced family lawyer with a particular interest in financial remedy proceedings and child contact disputes.
Guy’s profile on the independent Review Solicitor website can be viewed here.