Mirror Wills UK: How They Work for Couples (2025)

What this document is

A mirror will is not a single joint document. It is a pair of wills drafted in parallel, typically for spouses, civil partners or cohabiting couples, where each will reflects the same underlying wishes. In the usual setup, partner A leaves their estate to partner B, and partner B leaves their estate to partner A.

Both wills then set out what happens when the second partner dies, often naming the same children, relatives or charities as the final beneficiaries. The word 'mirror' describes this symmetry between the two documents. Each will is still a separate legal instrument owned by the person who signs it.

That matters, because either partner can change or revoke their own will at any time while they still have mental capacity, even after the other has died. Mirror wills are not binding on each other in the way a mutual will can be.

Couples sometimes confuse the two, and the difference can have a real impact on what eventually happens to an estate, particularly in blended families or where one partner remarries later in life.

How to use this document

1. Talk through your wishes together. Before anything is drafted, sit down with your partner and agree what you both want. Think about who inherits first, who inherits after the second death, whether there are specific gifts to children, grandchildren or charities, and who you trust to act as executor. Mirror wills only work well when both of you are genuinely aligned.
2. Take stock of your assets and your family situation. List your property, savings, investments, pensions, life policies and anything of sentimental or significant value. Note how assets are owned, because joint tenancy property passes outside the will. Flag anything that needs special thought, such as children from previous relationships, business interests, or family members who rely on you financially.
3. Choose executors and guardians carefully. Your executors handle the estate after you die, so pick people who are trustworthy, organised and willing to take on the role. If you have children under 18, you will also want to appoint guardians. Couples often name each other as first executor, with a backup named in both wills for when the second partner dies.
4. Have the wills professionally drafted. Although you can write a will yourself, mirror wills benefit from careful drafting so the two documents genuinely match and cover substitute beneficiaries, survivorship clauses and tax planning points. Poorly worded wills are one of the most common reasons estates end up in dispute, and the cost of fixing problems later usually dwarfs the cost of getting it right at the outset.
5. Sign, witness and store the wills correctly. Each will must be signed by the person making it in the presence of two independent adult witnesses who then sign themselves. Witnesses should not be beneficiaries or their spouses, or their gift can fail. Keep the originals somewhere safe, tell your executors where they are, and review the wills every few years or after any major life change.

Common questions