If you’re married, in a civil partnership, or simply sharing a life with someone, one of the first questions that comes up when you start thinking about wills is whether you should each have your own, or write one together. It sounds like a small decision. It isn’t, really. The choice between single wills and mirror wills shapes how your estate is dealt with, how much flexibility you keep as circumstances change, and how straightforward things are for whoever is left to sort everything out.
At Family Lawyers Glasgow, part of Complete Clarity Solicitors’ Family Law Team, we’re asked about this most weeks. Clients usually arrive with a rough idea of what they want but aren’t sure of the terminology, or whether mirror wills and mutual wills are the same thing (they’re not, and the difference matters more than you’d think). This article walks through single will vs mirror comparisons in plain English, so you can go into a conversation with a solicitor already knowing what to ask. If you’d like to talk it through properly, our team is happy to help you make an informed decision that actually fits your family.
What Is a Single Will?
A single will is exactly what it sounds like: one person’s individual will, drafted to reflect their own wishes, their own estate, and their own list of beneficiaries. It’s the most common starting point for anyone who isn’t married or in a civil partnership, though plenty of couples choose this route too, particularly where their financial affairs are separate or where there are children from previous relationships to think about.
A single will offers a lot of flexibility. You can appoint whoever you like as executor, leave specific gifts to specific people, set up a trust if that suits your situation, and change your mind later without needing anyone else’s agreement. That last point is worth sitting with for a moment, because it’s often the deciding factor for people who’ve been married before, or who simply want to keep their options open as life moves on.
There’s nothing complicated about the mechanics. A single will is a legal document, signed and witnessed in the usual way, and once it’s in place it governs how your estate will be distributed after your death, regardless of what anyone else in your life decides to do with theirs.
What Are Mirror Wills?
Mirror wills are two separate wills, usually made by a married couple or civil partners, where the terms of the two wills reflect each other almost exactly. In practice, this often means each partner leaves everything to the surviving partner first, and then, on the death of the second person, the estate passes to the same beneficiaries, typically children.
This is where a lot of confusion creeps in, so it’s worth being direct: mirror wills are not one joint document. They’re two individual wills that happen to say broadly the same thing. Because they’re separate documents, one partner can change their mirror will at any point, even after the other has passed away or without telling the other party at all. That surprises a lot of clients when we explain it in a first meeting.
Married couples often choose to make mirror wills because they want their wishes aligned without the rigidity of something more binding. It works particularly well where there’s a straightforward family structure, no children from previous relationships, and both partners are broadly in agreement about who should inherit and when. If your circumstances are a little more layered, it’s worth discussing with a solicitor whether mirror wills genuinely suit you, or whether individual wills tailored separately might serve you better.
Mirror Wills and Mutual Wills: What’s the Difference?
This is probably the single most common mix-up we come across, so understanding the differences here is genuinely useful. Mutual wills are made under an agreement, usually between spouses or partners, that neither person will change their will after the first person dies, and in many cases, not without the other’s consent even while both are alive. Once one partner has died, the survivor is bound by the terms they agreed to. In effect, mutual wills become irrevocable at that point, at least as far as the assets covered by the agreement go.
Mirror and mutual wills can look almost identical on paper when they’re first drafted. The wording might say the same thing. The beneficiaries might be the same people. But the legal effect is entirely different, and this is exactly the kind of nuance where it pays to seek legal advice rather than assume. With mirror wills, either person can walk into a solicitor’s office next week and rewrite their will from scratch. With mutual wills, that freedom is gone, or at least significantly restricted, once the agreement takes effect.
For most people, mutual wills are used less often than mirror wills these days, partly because they remove flexibility at a stage in life when circumstances change more than people expect. A new relationship, a change in family dynamics, a shift in what someone wants for their grandchildren- none of that can be accommodated once mutual wills have locked things in. That’s not necessarily a bad thing, if genuine certainty is what a couple wants, but it’s a decision that deserves proper thought rather than being made by accident.
Which Option Suits Your Estate Planning?
Deciding between a single will and mirror wills usually comes down to your family situation rather than any general rule. If you and your partner have children together, no complicating factors, and broadly the same wishes, mirror wills are often the simpler and more cost-effective route. Drafting two wills side by side, with a solicitor guiding both, tends to be quicker and cheaper than two entirely separate pieces of work.
Where things get more complicated, blended families, business assets, children from earlier relationships, or one partner wanting to set up a trust the other doesn’t need, individual wills usually make more sense. This lets each person’s estate planning reflect what actually applies to them, without trying to force two different sets of circumstances into matching documents.
It’s also worth remembering that mirror wills, precisely because they’re two separate wills, offer no guarantee that things will stay aligned. If one partner remarries after the other’s death, or simply has a change of heart, their mirror will can be rewritten in a way that no longer matches what was originally agreed. There’s no obligation to notify anyone, and no legal mechanism stopping it under Scots law, unless the couple specifically chose to make mutual wills instead.
None of this means one option is objectively better than the other. It genuinely depends on what you’re trying to achieve, how much certainty you want, and how your family is structured. This is precisely the kind of decision where a short conversation with a solicitor saves a great deal of second-guessing later on.
A Word on Executors and Beneficiaries
Whichever route you choose, you’ll need to think carefully about who acts as executor and who benefits under your estate. In mirror wills, couples often appoint each other first, with a backup executor named for later. That’s sensible in most cases, but it’s worth checking that your chosen executor understands what estate administration in Scotland actually involves, since it can be more demanding than people expect, particularly where there’s property or business assets involved.
If no valid will exists at all, whether single or mirror, the rules of intestacy in Scotland decide who inherits, and that outcome doesn’t always reflect what someone would have wanted. This is one of the strongest reasons to get something in place, even a straightforward single will, rather than leaving it to chance.
Getting the Right Advice for Your Situation
Wills in Scotland follow different rules to those in England and Wales, so it’s worth working with a solicitor who deals specifically with Scots succession law rather than relying on generic guidance found online. The Law Society of Scotland maintains standards for exactly this reason, and a properly drafted, legally binding will, whichever type suits you, gives real peace of mind that your estate will be distributed according to your wishes.
If you’re weighing up a single will and a mirror will and aren’t sure which direction to take, Family Lawyers Glasgow and the Complete Clarity Solicitors Family Law Team would be glad to talk it through with you. There’s no need to make the right choice alone, or to feel you have to arrive with all the answers already worked out. Get in touch, and we’ll help you put a will in place that genuinely reflects your circumstances, your family, and the people you want to look after.
