Most couples want the same thing from their wills: everything to each other first, then to the children. Mirror wills are the standard way to do it — two separate wills with matching terms, one for each partner. They are simple, popular and usually cheaper than two unrelated wills. They are also widely misunderstood, so it is worth knowing exactly what they do and do not promise.
What a mirror will is
A mirror will is an ordinary, individual will whose terms reflect a partner’s. A typical pair says: each partner leaves their estate to the other; if the other has already died, everything passes to the children equally; the same executors and guardians are named in both. You do not need to be married — mirror wills work for married couples, civil partners and cohabiting partners alike. For unmarried couples they are especially important, because without a will a cohabiting partner inherits nothing under the intestacy rules.
The wills do not have to be perfectly identical. Each partner can add personal touches — a gift of jewellery to a sister, a legacy to a different charity — while the core structure mirrors.
The crucial point: either of you can change yours
Mirror wills are two independent documents. Either partner can change or replace their will at any time — before or after the other dies — without permission and without telling anyone. After your death, your surviving partner could remarry, write a new will, and leave everything somewhere you never intended. That is not a flaw in how the wills were written; it is simply what mirror wills are.
This is different from "mutual wills", a rare arrangement where both partners legally agree never to change the wills, binding the survivor. Courts apply mutual wills strictly and they cause more litigation than almost any other will structure — most solicitors advise against them. If you want a real guarantee about where assets ultimately go, the usual answer is a trust structure in the will, not a mutual will.
Marriage revokes a will
One trap worth knowing: under the Wills Act 1837, getting married or entering a civil partnership automatically revokes any existing will, unless the will was expressly made "in contemplation of" that marriage. Couples who write mirror wills and later marry can unknowingly cancel both — leaving them back in intestacy. If a wedding is on the horizon, say so when you make the will.
When mirror wills are not enough
- Blended families — if either partner has children from a previous relationship, a simple "all to each other" structure risks those children being cut out by a later change; a life interest trust can protect both the survivor and the children
- Concerns about care fees or remarriage — again, trust structures rather than plain mirror wills
- Significantly different estates or wishes — there is no rule that couples must mirror; two distinct wills are sometimes the honest answer
Mirror wills with Willful
With Willful, each partner completes their own interview and receives their own will — reviewed individually by an SRA-regulated solicitor — for £99 per partner. If your situation is more involved, the questions will flag it and route you to the right structure rather than forcing a mirror that does not fit.