Mirror wills explained: how they work for couples

This guide is general information about the law in England and Wales, not legal advice. Every situation is different, so please speak to us or another qualified adviser before acting on it.

What are mirror wills?

Mirror wills are two separate wills, one for each partner, that are written to match. A typical pair says:

• "I leave everything to my partner."
• "If my partner has already died, or dies at the same time as me, I leave everything to our children (or other chosen people) in equal shares."

Each will names the same executors, the same guardians for any children under 18, and the same back-up beneficiaries. They're available to married couples, civil partners and unmarried couples. Mirror wills are especially important for unmarried couples, because a cohabiting partner doesn't inherit anything under the rules that apply when there's no will. See what happens if you die without a will.

What happens after the first death?

This is the most important thing to understand. When the first partner dies, their will takes effect and, usually, everything passes to the survivor. The survivor's will is still their own separate will, and they can change it at any time.

That flexibility is usually a good thing. Circumstances change, and the survivor may need to update their will in later life. But it also means there's no legal guarantee that your children or chosen beneficiaries will inherit in the end. For example, the survivor could:

• make a new will leaving everything to someone else
• remarry. GOV.UK says getting married cancels any will made before, so unless they make a new will, the intestacy rules would then apply, and a new spouse could inherit a large share.
• spend the money, including on care fees

Mirror wills vs mutual wills

People often confuse the two. Mutual wills are wills made with a binding agreement not to change them. HMRC's guidance explains that after the first death, the survivor holds the estate on a form of trust, so it has to go where the couple agreed. That gives more certainty, but very little flexibility, and mutual wills can be difficult to prove and to deal with. Most couples choose mirror wills instead, sometimes with extra planning where there's a particular concern.

When mirror wills may not be the best fit

GOV.UK recommends getting advice if your will isn't straightforward. Mirror wills may not suit you on their own if:

• you have children from a previous relationship, and you want to make sure they inherit, whatever the survivor later decides
• you have different wishes from your partner, in which case you'd each need your own, different single will
• you own property overseas, run a business, or want to provide for someone who can't look after themselves
• your estate is large enough for inheritance tax planning to matter (see below)

We'll talk through your situation on your call. If mirror wills aren't the right choice, we'll say so. We don't give regulated financial or tax advice, and if you need specialist help we'll tell you.

Your home: check how you own it

A will can only pass on what you own in your own name. GOV.UK explains that if you own your home as joint tenants, it automatically goes to the other owner when you die, and you can't leave your share in your will. If you own it as tenants in common, your share doesn't automatically go to the other owner, and it passes under your will. If you're relying on your will to pass on your share of the home, check which one applies. HM Land Registry's records will show it, and you can change the type of ownership.

Mirror wills and inheritance tax

Gifts between spouses and civil partners are normally free of inheritance tax. Any unused tax-free threshold can also be passed to the survivor, so a married couple can potentially pass on up to £1 million tax-free when the family home goes to their children or grandchildren. Unmarried partners don't get either of these benefits, so a gift to a cohabiting partner can be taxed if the estate is over the threshold. Our inheritance tax guide explains the thresholds, including the pension changes from April 2027.

Making mirror wills valid

Each will must be signed by the person making it in front of 2 witnesses, both 18 or over, who then sign in that person's presence. GOV.UK says that both witnesses must be able to see the signing clearly, and that witnesses (and their married partners) can't inherit anything under the will. A partner can't witness the other partner's will because they're a beneficiary. Signing and witnessing correctly is your responsibility. We send a step-by-step guide, and we're happy to explain anything before you sign.

Review your wills every 5 years and after big life changes, such as a marriage, separation, new child or house move. Our free will check takes about a minute.

What mirror wills cost with us

The prices are fixed and agreed on a free call before we start, with no VAT. They include an appointment by phone or video, guardians for your children, drafts within 14 days of you instructing us and us receiving all the information we need from you, free changes before signing, and your final documents within 3 working days of you approving the drafts. You're also covered by our 14-day money-back promise (see our terms).

Many couples add Lasting Powers of Attorney at the same time, because a will only covers what happens after death.

Sources: GOV.UK: Make a will; HMRC Inheritance Tax Manual IHTM12063 (mutual wills); GOV.UK: Joint property ownership; GOV.UK: Inheritance Tax; GOV.UK: Inheritance if there's no will. Checked 23 October 2026.