A joint will is a single document executed by two people, which operates as the will of both of them. One piece of paper, signed by a husband and a wife, admitted to probate on the first death as that person’s will and then again years later, on the second death, as the survivor’s will.
It is legally possible in Singapore. It is also rare, and almost every practitioner asked to prepare one will try to talk the couple out of it. The reason is not that joint wills are invalid (they can be perfectly valid) but that they create real problems in administration and interpretation while delivering nothing that two ordinary wills do not deliver more cleanly.
Joint, mirror and mutual wills are three different things
These terms are used interchangeably in conversation and mean quite different things in law. Getting them straight is most of the battle.
| Documents | Can it be changed? | How common | |
|---|---|---|---|
| Joint will | One document, two testators | Unclear unless expressly stated; this is the core problem | Rare |
| Mirror wills | Two separate, substantially identical wills | Yes, each person freely, at any time | The normal arrangement for couples |
| Mutual wills | Two separate wills plus a binding agreement not to revoke | No; equity holds the survivor to the agreement | Uncommon and deliberate |
What most couples want when they say “a joint will” is mirror wills: two documents saying everything goes to the survivor, and then to the children. Each spouse keeps their own will, each can change it, and the estate of the first to die is administered from a document that concerns only that person.
What some couples want, without realising the weight of it, is a mutual wills arrangement, a genuine promise that neither will change course. That is a serious commitment with consequences that outlast the first death, and it is dealt with fully in mutual wills and the binding agreement behind them. If that is what you are after, read that first, because a joint will is a poor and ambiguous way to try to achieve it.
The practical problems with one document
The original has to be produced twice
Probate is granted on the original will, not a copy. With a joint will, the original is required on the first death and then again on the second, possibly twenty or thirty years later, after the survivor has moved house, changed solicitors, remarried, or lost the folder it lived in.
In practice the original is retained by the court or the registry when the first grant is extracted, and the survivor’s executor then has to apply to obtain or prove a copy from the record. It is not impossible. It is an extra step, at a moment when the family is already dealing with a death, and it depends on records surviving intact for decades. Two separate wills have none of this difficulty: each estate is administered from its own document, kept in its own place. Where to keep them is worth thinking about on its own terms. See where to store a will safely.
Nobody knows whether the survivor may revoke it
This is the substantive problem, and it is not solved by drafting alone. A will is by nature revocable. But a joint will looks like a joint arrangement, and the surviving spouse who makes a new will afterwards will sooner or later face the argument that they were not entitled to.
Was the joint will merely convenient, two wills stapled into one, each freely revocable? Or was it a binding compact: you leave everything to me, I leave everything to your children, and neither of us walks away from that? The document frequently does not say. The two people who knew the answer are, by the time the question matters, one deceased and one accused.
That question is litigated. It is litigated between a surviving spouse and adult stepchildren, years after the event, on evidence consisting of recollections and a file note nobody made.
It invites an argument about intention
Because a joint will is unusual, its very existence is treated as significant. A party arguing that the survivor is bound will say that the couple would not have gone to the trouble of a single document unless they meant to tie themselves together. A party arguing the opposite will say that a joint will is simply a drafting economy and that revocability is the default.
Both arguments are respectable, which is exactly what makes the dispute expensive. Two separate wills, plus an explicit clause stating whether or not the parties intend to be bound, produce no such argument. The same clarity problem shows up whenever someone tries to change course later. See how a will is revoked.
What happens on the first death
On the first death, the joint will is proved as the will of the deceased. The executor named in it applies for a grant of probate in the ordinary way, and the deceased’s estate is distributed according to the parts of the document that deal with that person’s property.
The administrative awkwardness starts here. The document contains dispositions by two people, only one of whom has died. It has to be read selectively. Banks and land registries dealing with a document that also disposes of a living person’s assets will ask questions. Where the drafting does not clearly separate “my estate” from “our estate”, the executor may need directions.
Then the original goes into the court record, and the survivor is left holding a copy of a document that is still, in theory, their own will. Whether they can now make a new one is the question above, and it is a genuinely uncomfortable position to be in: free to remarry and rearrange their affairs, but not confident they are free to change the will.
Why two separate wills is nearly always better
The advice is consistent for a simple reason: separate wills give you everything a joint will gives you, and nothing it costs you.
- Each estate is administered from its own document, with its own original, produced once.
- Each person can update independently for a new grandchild, a changed executor or a different charitable gift, without needing the other’s document or agreement.
- Privacy is preserved. A joint will exposes each spouse’s dispositions to the other in full, permanently. Some couples want that; not all do.
- Revocability is clear. A separate will can be revoked by its maker, and everyone knows it.
- If you do want a binding commitment, it can be created expressly and on advice, rather than inferred from the shape of a document.
The mechanics of drafting either arrangement are the same, and cost roughly the same, and the process is set out in how to make a will in Singapore. There is no saving to be had from a joint will.
Why people ask for one anyway
Almost every request for a joint will comes from the same place: a fear that the survivor will not honour the plan. It is most acute in second marriages, where each spouse has children from an earlier relationship and each is quietly worried that leaving everything to the other will end with their own children receiving nothing.
That worry is legitimate. The joint will is simply the wrong tool for it. It provides the appearance of a lock without a reliable mechanism, and it converts a family’s anxiety into an eventual lawsuit.
The better answers are structural. A trust can hold the assets, provide an income for the surviving spouse during their lifetime, and direct the capital to named children afterwards, with a trustee whose duties are enforceable. See how trusts are used in estate planning and, for the threshold decision, whether you need a trust or just a will. A life interest in the matrimonial home, giving the survivor the right to live there without the right to sell it out from under the children, achieves much of the same result with less machinery.
Which structure fits depends on how the family is composed, whose money bought what, and how much the two households need to be kept apart. The options and trade-offs specific to remarriage are worked through in estate planning for blended families.
If a joint will already exists
If you signed one, perhaps abroad, perhaps decades ago, do not assume it is void, and do not assume you are free to ignore it.
Get the document reviewed. The first question is whether it contains any express statement about revocability; a surprising number do, and that ends the argument. The second is what evidence exists about the surrounding agreement. If both makers are alive and agree, the cleanest fix is to revoke it and execute two fresh wills, with an explicit revocation clause in each. If one has already died, take advice before making a new will, because the answer depends on facts specific to your document. The wider framework for all of this sits in the wills and probate guide.
