Can someone with dementia still sign a valid will in Singapore?

Sometimes, yes. A dementia diagnosis does not itself invalidate a will — Singapore applies the Banks v Goodfellow test at the moment of signing, and the law recognises lucid intervals. What decides validity is whether, at that moment, the person understood the act, their property, and the claims on it. A doctor's capacity assessment made on or near the signing date is the practical safeguard; without one, the will invites challenge.

Can a court-appointed deputy make a will for my father?

Not in Singapore. Section 26 of the Mental Capacity Act 2008 excludes making a will from what anyone can decide on another person's behalf — deputies and LPA donees included. This differs from England and Wales, where the Court of Protection can order a statutory will under the Mental Capacity Act 2005. In Singapore, once testamentary capacity is gone, the last valid will stands, or intestacy law applies.

Is it too late to make a Lasting Power of Attorney after a stroke?

Only if capacity to make it is gone — and a stroke does not automatically mean it is. An LPA requires the donor to understand what powers he is giving and to whom, which is a less demanding decision than many commercial ones. If he retains that understanding, an LPA can still be made and certified. If he does not, the family's route is a deputyship application to the court, which is slower and court-supervised.

Do existing CPF and insurance nominations still apply if my father loses mental capacity?

Yes. Nominations, wills, and trusts validly made while he had capacity remain effective; losing capacity does not revoke them. It also means they can no longer be updated for him — a nomination naming an ex-spouse or a predeceased nominee stays as it is. Reviewing what already exists is therefore one of the most useful things a family can still do after capacity is in doubt.

Verified 2026-08-27

My father had a stroke. Is it too late to set up a trust or a will?

Not necessarily — but the window may be closing, and it closes unevenly. The law tests mental capacity at the moment of signing, decision by decision: a stroke is a medical event, not a legal verdict. Under Singapore's Mental Capacity Act 2008, a person is assumed to have capacity until it is shown otherwise, and capacity for a simple will is a lower bar than capacity for a complex trust restructuring. The testamentary test comes from Banks v Goodfellow (1870), endorsed by Singapore's Court of Appeal in Chee Mu Lin Muriel v Chee Ka Lin Caroline [2010] SGCA 27 — and it recognises lucid intervals. What is genuinely closed once capacity is lost: no new Lasting Power of Attorney, and in Singapore, no one — not even the court — can make a will for him. Everything already signed stands.

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Capacity is decision-specific, and it is tested at the pen

Singapore law does not ask 'does he have capacity?' in the abstract. The Mental Capacity Act 2008 asks whether, at the material time, he can understand, retain, use, and weigh the information relevant to this decision, and communicate his choice. A man who can no longer run a board meeting may still validly sign a will; a man who can sign a will on Tuesday morning may not be able to on Thursday. The four-part testamentary test — understanding the nature of the act, the extent of the property, and the claims of those who might expect to inherit, free of a disorder of mind distorting the disposition — dates from Banks v Goodfellow (1870) and remains Singapore law per the Court of Appeal in 2010.

This is why the honest answer after a stroke is 'get an assessment, quickly' rather than either 'too late' or 'no problem.' A contemporaneous capacity assessment by a doctor, ideally on the day of signing, is what makes a document signed in this period defensible. Families that skip it hand the eventual challenger their best argument. Families that obtain it can act during a lucid interval with confidence — the law has always allowed exactly that.

What closes when capacity is lost — and what Singapore will not do

A Lasting Power of Attorney can only be made by a person who still has capacity — that is the entire design. Once capacity is gone, the family's route is a court application under the Mental Capacity Act for a deputy: slower, supervised, and scoped by the court order. A deputy can manage property and affairs within the powers granted, but section 26 of the Act puts some decisions beyond anyone's reach — no deputy, donee, or court in Singapore can make or remake a will on his behalf, or consent to marriage or divorce for him.

This is a point on which jurisdictions genuinely differ, and it matters for families with English assets or English advice. In England and Wales, the Court of Protection can order a 'statutory will' executed for a person without testamentary capacity under section 18(1)(i) of the Mental Capacity Act 2005. Singapore's Act contains no equivalent power. If your father loses capacity here, his testamentary position is frozen: the last valid will stands, or if there is none, the Intestate Succession Act decides. Existing CPF and insurance nominations also stand as made — they cannot be redone for him.

Why the window closes gradually — and what that means this month

Capacity rarely leaves all at once. It narrows: the complex decisions go first, the simple ones last. Practically, that ordering is the family's planning sequence in reverse. A sophisticated trust settlement — moving operating companies, weighing tax in three jurisdictions — demands more understanding than an LPA or a straightforward will, so the elaborate structure the family postponed for years may already be out of reach while a will and an LPA are still perfectly achievable this month.

None of this needs to be a deathbed scramble, and it should not be framed as one to him. The question 'who signs, while you recover' is an operating question, and recovery is its honest frame. But the sequencing deserves candour inside the family: what can still be signed should be signed while the assessments are clean, because the alternative — deputyship for his lifetime and intestacy after it — is the outcome nobody in the family, on any side, would have chosen. Wanting this settled while he can still direct it is stewardship, not greed.

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Sources: Mental Capacity Act 2008 — Singapore Statutes Online · Chee Mu Lin Muriel v Chee Ka Lin Caroline [2010] SGCA 27 · Singapore Courts — limits on what a deputy may decide · Last verified 2026-08-27. Corrections: see the log.