What Are the Pros and Cons of Mirror Wills?
Direct Answer: The main advantage of Mirror Wills is simplicity: two people with similar wishes can create separate Wills that follow the same overall inheritance plan. The main disadvantage is that the arrangement is not normally binding on the survivor, so a Mirror Will alone cannot guarantee that children or other beneficiaries will ultimately inherit the assets originally intended for them.
For many couples with straightforward estates and matching wishes, Mirror Wills can provide a practical way to put an estate plan in place.
However, whether they are suitable depends on what you are trying to achieve. In particular, there is an important distinction between providing for your partner and controlling where assets ultimately pass after your partner's death.
Advantages of Mirror Wills
- Simple structure: suitable where both people have broadly matching wishes.
- Provides for the survivor: each partner can leave their estate to the other.
- Backup beneficiaries: children or other beneficiaries can inherit if the partner has already died.
- Separate legal documents: each person retains their own Will.
- Flexible: either person can normally update their Will if circumstances change.
Disadvantages of Mirror Wills
- Not normally binding: the survivor can usually make a different Will.
- Inheritance is not guaranteed: children named in the original Wills may not ultimately receive the expected assets.
- Remarriage risk: a later marriage or civil partnership can affect an existing Will.
- Blended-family complications: children from previous relationships may require greater protection.
- Outright inheritance: assets left outright to the survivor are generally then under the survivor's control.
When are Mirror Wills a good option?
Mirror Wills may be appropriate where a couple has a relatively straightforward estate, trusts the survivor to honour their shared intentions and wants to retain flexibility if circumstances change.
A common example is a married couple whose main objective is simply:
"Everything to my spouse first — and if they have already died, everything to our children."
That can be a perfectly reasonable estate-planning objective. The issue is understanding that it provides a direction for your own estate, rather than permanently controlling what the survivor does with inherited assets afterwards.
When might a basic Mirror Will not be enough?
A more sophisticated Will structure may be worth considering where your objective goes beyond simply leaving everything to the survivor.
This can be particularly relevant where:
- either partner has children from an earlier relationship;
- you are concerned about a future remarriage;
- you want to preserve a share of the family home for children;
- you want a surviving partner to benefit from an asset without necessarily owning the underlying capital outright;
- there are vulnerable or financially inexperienced beneficiaries; or
- you want greater control over who ultimately receives particular assets.
Estate-planning question: If it is important that your partner can benefit from an asset but equally important that the capital ultimately passes to your children, leaving that asset outright under a basic Mirror Will may not achieve both objectives.
Mirror Will or Life Interest Trust?
This is where the distinction between a straightforward Mirror Will and a Will containing a Trust becomes important.
With an outright gift under a basic Mirror Will, the survivor generally becomes the owner of the inherited assets. With an appropriately drafted Life Interest Trust, the survivor can instead be given defined rights or benefits while the underlying capital is preserved for the eventual beneficiaries.
Our Life Interest Trusts guide explains how this type of Will Trust works and when it may be considered as part of estate planning.
Where the main concern is specifically protecting a share of the family home, see our Property Protection Trust Wills guide .
Bottom line: Mirror Wills can work well for straightforward matching wishes. But if your priority is protecting an inheritance for children after the first partner dies, consider whether an outright gift to the survivor provides enough control.
