Couples planning marriage or long term commitment often want a straightforward answer about protecting family assets. Should they sign a prenuptial agreement, or should they rely on inheritance trusts and wider estate planning?
In the UK, these tools do different jobs. A prenup is an agreement between partners, while a trust is a structure that controls how assets are owned and distributed. The best choice depends on who is doing the planning and what risk you are trying to reduce.
What a prenuptial agreement is good for
A prenup sets out how assets should be treated if the marriage ends. In England and Wales, prenups are not automatically binding, but courts often follow them when they are entered into freely, with disclosure, legal advice, and fair terms.
Prenups tend to work well for:
- clarifying that an inheritance (already received or expected) should be treated as separate
- protecting pre marriage wealth and family gifts
- setting boundaries around the family home or business interests
- reducing uncertainty and conflict if the relationship ends
A postnuptial agreement can achieve a similar result after marriage.
Where prenups can fall short:
- they cannot remove the court’s duty to ensure a fair outcome, especially where children are involved
- if the agreement is rushed, unfair, or signed under pressure, it may carry less weight
What an inheritance trust is good for
An inheritance trust is part of estate planning, usually created in a will or during lifetime, that controls how assets pass to beneficiaries. Instead of leaving assets outright to a child, a parent can leave them to trustees, who manage access and distributions.
Trusts can be useful for:
- protecting beneficiaries who are vulnerable, young, or financially inexperienced
- controlling when beneficiaries can access capital
- reducing the chance that inherited capital is mixed into marital assets
- managing complex families, including second marriages and children from previous relationships
Which works better for UK couples?
It depends on the starting point.
If you are the couple getting married, a prenup can be the most direct way to set expectations about how you will treat inheritances and family gifts during the marriage and in a divorce.
If you are parents planning what to leave, a trust can be more powerful because it changes how the beneficiary receives the asset in the first place.
In many real situations, the strongest approach is combining both: parents structure inheritances carefully, and the couple agrees in writing how any inherited wealth will be handled.
Common mistakes to avoid
- receiving inheritance and using it immediately for a joint purchase without any documentation.
- assuming “inheritance is always protected,” then mixing it into joint accounts.
- leaving a prenup until days before the wedding.
- setting up a trust without considering how it interacts with the beneficiary’s marriage and housing needs.
