Contesting a Will in Singapore: Grounds, Caveats and What Estate Disputes Really Cost Families

By Johnathan Lee, Advocate and Solicitor (Singapore). Updated 31 July 2026.

In Singapore, a will can only be contested on established grounds: failure to meet the execution formalities in section 6 of the Wills Act 1838, lack of testamentary capacity, lack of knowledge and approval, undue influence, or fraud and forgery. Feeling that the will is unfair is not, by itself, a ground. The usual first step is a caveat under rule 34 of the Family Justice (Probate and Other Matters) Rules 2024, which blocks any grant for 6 months, and a further caveat can be entered when it lapses.

After leaving the Ministry of Manpower, I spent time assisting in my family’s funeral business. I have stood in the room when a family discovered, mid-wake, that the will did not say what everyone had assumed. These disputes rarely begin in a courtroom. They begin at the funeral, when grief meets money.

What are the grounds for contesting a will in Singapore?

There are five recognised grounds. First, formal invalidity: section 6 of the Wills Act 1838 requires the will to be in writing, signed by the testator at the foot or end, with the signature made or acknowledged before 2 or more witnesses present at the same time, who then sign in the testator’s presence. Second, lack of testamentary capacity. Third, lack of knowledge and approval. Fourth, undue influence, meaning coercion that overpowers the testator’s own wishes, not mere persuasion. Fifth, fraud or forgery.

Ground	What must be shown	Typical evidence
Formal invalidity	Execution did not comply with section 6, Wills Act 1838	The will, the attestation clause, witness testimony
Lack of testamentary capacity	The Banks v Goodfellow test was not met when the will was made	Medical records, reports from the testator’s doctors, the drafting lawyer’s file
Lack of knowledge and approval	The testator did not understand and approve the contents	Suspicious circumstances, who prepared the will, language barriers
Undue influence	Coercion that overbore the testator’s free will	Evidence of dependency, isolation, control
Fraud or forgery	The signature or document is not genuine, or the testator was deceived	Forensic handwriting and document examination

One common trap: under section 13, marriage generally revokes an earlier will.

Can a will be valid if the person who made it had dementia?

Yes, it can. A dementia diagnosis does not automatically invalidate a will. What matters is the testator’s mental state when the will was made. The Court of Appeal in Chee Mu Lin Muriel v Chee Ka Lin Caroline [2010] SGCA 27 applied the Banks v Goodfellow (1870) test: the testator must understand the nature of making a will and its effects, know the extent of their property, appreciate the claims of those who might expect to benefit, and be free of any disorder of the mind that perverts their judgement. A medical condition establishing impairment does not by itself conclude the matter.

The same case dealt with knowledge and approval. Where a will is prepared in suspicious circumstances, for example by someone who takes a substantial benefit under it, the person seeking to uphold it must positively prove the testator knew and approved its contents. The 1996 will there was held invalid on that combination of cognitive impairment and unexplained, unusual provisions. The evidence that decides these cases is the contemporaneous medical record and the drafting lawyer’s attendance notes, so preserve both early.

How do I file a caveat to stop probate in Singapore?

A caveat is the emergency brake. Under rule 34 of the Family Justice (Probate and Other Matters) Rules 2024, any person may, after the death and before any grant is made, enter a caveat in the Family Justice Courts. While an effective caveat stands, the Registrar must not make any grant. The caveat remains in force for 6 months, then ceases to have effect, but a further caveat can be entered while you investigate. A caveator can withdraw earlier by filing a notice of withdrawal.

Timing is everything. Once a grant is extracted and assets distributed, you are fighting to revoke a grant and claw money back, a far harder position. If you have a genuine concern, the caveat should go in before the executor applies; my grant of probate guide explains the normal process. A caveat is not costless: an unmeritorious objection attracts adverse costs orders once the executor challenges it. Where the dispute is real, it becomes a contentious probate action in the Family Courts or, where the estate is believed to exceed $5 million in value, the Family Division of the High Court.

What does contesting a will really cost, and how long does it take?

I will be direct. A fully fought probate action is civil litigation: pleadings, affidavits, discovery of medical and financial records, opinion evidence from doctors and forensic document examiners, cross-examination at trial. Expect a fought action to run a year or more, with legal costs on both sides that can consume a painful share of a modest estate. Costs generally follow the event, so the loser is usually ordered to pay a substantial part of the winner’s costs on top of their own. Courts can order costs out of the estate in limited situations, but do not budget on that mercy.

There is also a cost no bill captures. I have seen siblings stop speaking permanently over a dispute that settled for less than either side spent on lawyers. My honest screening questions: is the estate large enough to justify the fight, is your evidence more than suspicion, and is there a relative you still want at your dinner table when this ends?

Is there a way to resolve a will dispute without a trial?

Yes, and most disputes should end this way. First, negotiation leading to a family settlement, recorded in a deed of family arrangement redistributing the estate by agreement. Adult beneficiaries of full capacity are generally free to do this without attacking the will’s validity in court. Second, mediation: a neutral mediator helps the family reach terms privately, and the Family Justice Courts encourage parties in probate disputes to attempt it. Third, settlement within the court process itself.

From my time in the family funeral business, one practical rule: do not negotiate at the wake. Decisions made in the first week after a death are made by grieving people at their worst. File the caveat if you must protect your position, then let a month pass before anyone talks numbers. A settlement reached calmly holds. One extracted under grief and pressure tends to unravel.

How do I stop my own will from being contested one day?

Prevention is cheaper than any of the above. First, get the formalities right: writing, signature at the foot or end, two witnesses present at the same time, and no beneficiary or beneficiary’s spouse among the witnesses, per sections 6 and 10 of the Wills Act 1838. I set out the full checklist in my guide on how to make a valid will in Singapore. Second, if you are elderly or unwell, ask a doctor for a contemporaneous opinion on your capacity at the time of signing; it is the most persuasive answer to a later dementia challenge. Third, use a lawyer who keeps proper attendance notes and takes instructions from you alone.

Fourth, manage expectations. Many challenges are really about surprise: the child who expected the house and learnt otherwise at the wake. A letter of wishes explaining an unequal division removes the oxygen from a future dispute. Finally, review the will after every major life event, especially marriage, since marriage generally revokes an earlier will under section 13.

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Frequently asked questions

How long does a probate caveat last in Singapore?

A caveat entered under rule 34 of the Family Justice (Probate and Other Matters) Rules 2024 remains in force for 6 months, then lapses automatically. A fresh caveat can be filed after it lapses, and a caveator can withdraw earlier by filing a notice of withdrawal. It must be entered before any grant is made.

Can I contest a will after probate has been granted?

Yes, but it is harder. The court can revoke a grant, for example where the will is later proved invalid or a later will surfaces. By then the executor may have distributed assets, and recovering them adds cost and risk. If you already have concerns, file a caveat before any grant is extracted.

Does dementia automatically make a will invalid?

No. The question is whether the testator met the Banks v Goodfellow test when the will was made: understanding the nature of a will, the extent of their property and the claims of those close to them, free of a disorder of the mind. The Court of Appeal confirmed in Chee Mu Lin Muriel [2010] SGCA 27 that a medical condition alone does not decide the issue.

Who pays the legal costs in a will dispute?

Usually the losing party. Costs in Singapore litigation generally follow the event, so an unsuccessful challenger is often ordered to pay a substantial part of the winning side’s costs on top of their own. Courts can order costs out of the estate in limited situations, but never assume the estate will absorb the bill.

What happens if the court decides the will is invalid?

The estate falls back on the last valid earlier will, if one exists. If there is none, the estate of a non-Muslim is distributed under the intestacy rules in the Intestate Succession Act, which fix the shares of the spouse, children and other relatives. Invalidating a will does not mean the challenger simply inherits everything.

This article is general information, not legal advice. It states Singapore law as at July 2026. Speak to a lawyer about your specific situation.