Grounds for contesting a will are the legally recognised reasons that allow an eligible person to challenge the validity of a will in an Australian court. The main grounds recognised under Australian law include lack of testamentary capacity, undue influence, improper execution, fraud, forgery, and lack of knowledge and approval. Feeling disappointed by what a will says is not enough. Courts uphold the testator’s right to distribute their estate freely, and only verifiable legal defects will succeed. If you believe a will does not reflect the genuine wishes of the deceased, understanding the specific legal basis for your claim is the first step.
What are the main grounds for contesting a will?
Contesting a will requires legal standing and at least one recognised ground, such as lack of testamentary capacity, undue influence, improper execution, or fraud. These are not interchangeable categories. Each ground has its own evidentiary threshold, and courts treat them differently in terms of how difficult they are to prove and what outcome they produce. Understanding which ground applies to your situation determines your litigation strategy from day one.
The burden of proof rests with the person contesting the will, who must provide clear and convincing evidence to invalidate the document. Courts focus on objective evidence such as medical records, solicitor attendance notes, and witness statements rather than family grievances or anecdotal accounts. This is a point many challengers underestimate when they first consider challenging a will in NSW.
What does testamentary capacity mean and how does it affect will contests?
Testamentary capacity is the legal standard a person must meet to make a valid will. Under the Banks v Goodfellow standard, the testator must have understood the nature of making a will, the extent of their assets, who their natural heirs are, and the effect of the dispositions they were making at the precise moment of signing. All four elements must be present simultaneously.
A common misconception is that a dementia diagnosis automatically invalidates a will. It does not. Lucid intervals allow a person diagnosed with dementia or Alzheimer’s disease to validly execute a will if their capacity was intact at the time of signing. Medical records from the day of signing carry far more weight than a general diagnosis made weeks or months earlier.
To build a capacity challenge, you need:
- Medical records from around the time the will was signed
- GP notes, specialist assessments, or hospital records
- Evidence of confusion, disorientation, or cognitive decline at the relevant time
- Statements from people who witnessed the testator’s condition
- Solicitor attendance notes from the will signing appointment
Pro Tip: If the solicitor who drafted the will kept detailed attendance notes recording the testator’s responses and mental state, those notes can either support or undermine a capacity challenge. Request them early through your lawyer.
How undue influence can invalidate a will and ways to prove it
Undue influence means that someone coerced the testator into making a will that did not reflect their own free wishes. The legal threshold is high. Undue influence requires proving coercion that overrides the testator’s free will entirely, not merely moral persuasion, emotional pressure, or persistent requests. A family member lobbying hard for a larger share does not meet the standard.
Proving undue influence is challenging because direct proof is almost never documented. Courts rely on circumstantial evidence, and the influencer’s role in drafting and benefiting from the will is a key red flag. The more isolated the testator was from independent advice, the stronger the inference of coercion.
Courts look for patterns such as:
- The testator being isolated from family or friends by the alleged influencer
- A caregiver, new partner, or recently introduced person being the primary beneficiary
- Sudden and unexplained changes to a will made shortly before death
- The testator having limited English or cognitive vulnerability
- The alleged influencer being present at the will signing or instructing the solicitor
Pro Tip: Gather evidence of the testator’s social isolation early. Phone records, visitor logs from aged care facilities, and emails between the alleged influencer and the solicitor can all become critical exhibits.
Why proper execution matters and what mistakes lead to challenges
A will that is not properly executed is invalid regardless of what it says. Under Australian succession legislation, which mirrors the principles of the Wills Act 1837, a valid will must be in writing, signed by the testator, and witnessed by two people who are both present at the same time as the testator signs. The simultaneous presence requirement is non-negotiable.
DIY wills frequently fail on execution due to minor technical mistakes that are entirely avoidable. The most common errors include witnesses signing at a different time to the testator, a beneficiary or their spouse acting as a witness, and the testator failing to sign every page where required.
| Proper execution | Improper execution |
|---|---|
| Two independent witnesses present simultaneously | Witnesses sign separately or later |
| Testator signs in the presence of both witnesses | Testator signs alone and hands document to witnesses |
| Witnesses are not beneficiaries or spouses of beneficiaries | A beneficiary or their spouse acts as a witness |
| Will is in writing and legible | Handwritten additions or alterations without attestation |
| Testator signs at the end of the document | Signature appears elsewhere or is initialled only |
Pro Tip: Even if a will has an execution defect, some Australian courts have a discretionary power to admit an informal will to probate if there is evidence the document was intended to be the deceased’s will. This is not guaranteed, but it is worth exploring with a specialist.
Other legal grounds: fraud, forgery, and lack of knowledge and approval
Fraud and forgery are distinct grounds but both strike at the authenticity of the will itself. A will procured by fraud or forgery can be declared invalid and constitutes both a civil ground for contesting and a criminal offence. Handwriting experts, witness statements, and bank records typically form the evidentiary foundation for these claims.
Lack of knowledge and approval is a separate and often overlooked ground. It applies where the testator signed a will without understanding or approving its contents, even if they had the mental capacity to make a will. This arises in situations involving language barriers, rushed signings, or where a beneficiary was closely involved in drafting the document.
Courts treat suspicious circumstances as a trigger for closer scrutiny. Red flags include:
- The testator signing a document in a language they did not read
- A beneficiary instructing the solicitor on the testator’s behalf
- The will being signed in unusual haste, particularly near the end of life
- Significant departures from earlier wills without a clear explanation
- The testator expressing surprise at the contents after signing
These grounds are distinct from simple family disagreements. A testator is entirely free to leave their estate to whoever they choose, including strangers. The question is always whether the document genuinely represents their informed and free decision.
Who can contest a will, and what are the time limits and costs?
Legal standing to contest a will is not universal. In New South Wales, the people most commonly eligible include spouses, de facto partners, children, former spouses, and certain dependants or household members. The specific eligibility criteria and time limits vary depending on whether you are contesting the will’s validity or making a family provision claim.
Time limits are strict and missing them can extinguish your right to challenge entirely. As a general guide:
- Family provision claims in NSW must be filed within 12 months of the date of death.
- Probate challenges based on validity grounds should be brought before a grant of probate is made, or as soon as practicable after discovery.
- Litigation costs can exceed £10,000 to £100,000 in comparable jurisdictions, and Australian estate litigation carries similar financial exposure depending on complexity.
- No-contest clauses exist in some wills to discourage challenges, but their enforceability varies by jurisdiction and professional legal advice is essential before treating them as a bar to action.
- Gather evidence before approaching the court. Medical records, financial documents, and witness contact details should be secured as early as possible.
The financial risk of contested estate litigation is real. Costs can be ordered against an unsuccessful challenger, which means a weak claim can leave you worse off than accepting the will as written.
Comparing the main grounds: strength, evidence, and likely outcomes
Not all grounds carry equal weight. The table below summarises the key differences to help you assess where your claim sits.
| Ground | Evidence required | Difficulty to prove | Typical outcome if successful |
|---|---|---|---|
| Lack of testamentary capacity | Medical records, GP notes, solicitor attendance notes | Moderate | Will declared invalid, earlier will or intestacy applies |
| Undue influence | Circumstantial evidence, witness statements, communication records | High | Will declared invalid in whole or in part |
| Improper execution | The will document itself, witness accounts | Low to moderate | Will refused probate |
| Fraud or forgery | Handwriting analysis, bank records, witness testimony | High | Will voided, potential criminal referral |
| Lack of knowledge and approval | Solicitor notes, interpreter records, draft history | Moderate | Will set aside, earlier will or intestacy applies |
Funding your legal matter: no win, no fee
Simons George Legal offers No Win, No Fee arrangements for eligible will contest and estate litigation matters. This means that if your case does not succeed, you do not pay legal fees, removing the upfront cost barrier that stops many people with legitimate claims from acting.
Eligibility is assessed during a free initial consultation, where the team at Simons George Legal will review the facts of your matter, identify the applicable grounds, and give you an honest assessment of your prospects. There is no obligation to proceed after that conversation.
If you believe a will does not reflect the genuine wishes of the deceased, the right time to seek advice is now. Time limits apply, and evidence becomes harder to gather as time passes. Book your free case assessment with Simons George Legal today.
No Win, No Fee arrangements are subject to case eligibility and a written costs agreement. Liability limited by a scheme approved under Professional Standards Legislation.
Key takeaways
Successfully contesting a will requires at least one legally recognised ground, objective evidence to support it, and legal standing to bring the claim in the first place.
| Point | Details |
|---|---|
| Grounds are specific, not general | Disappointment or perceived unfairness does not constitute a valid legal ground to contest a will. |
| Capacity is assessed at signing | A dementia diagnosis does not automatically void a will; courts examine the testator’s state at the precise moment of signing. |
| Execution errors can void a will | Improper witnessing, including a beneficiary acting as witness, is one of the most common and straightforward grounds. |
| Undue influence is hard to prove | Courts require evidence of coercion overriding free will, not just family pressure or persuasion. |
| Time limits are strict | In NSW, family provision claims must generally be filed within 12 months of the date of death. |
What I have seen in contested will matters
After working in wills and estates law for years, the pattern I see most often is this: people come to me with a genuine sense of injustice, but their instinct about what happened and the legal evidence needed to prove it are two very different things. Feeling certain that a parent was manipulated is not the same as having the medical records, attendance notes, and witness accounts that a court will actually weigh.
The cases that succeed are almost always the ones where the challenger acted quickly, gathered objective evidence before it disappeared, and had realistic expectations about cost and timeline. The cases that fail, or that settle for far less than expected, are usually the ones where the challenger relied on family stories and assumed the court would see what they see.
My honest advice is this: if you have a genuine concern about how a will came to be signed, speak to a specialist before you do anything else. Do not confront the executor, do not make allegations to other family members, and do not assume a no-contest clause stops you from acting. Get a proper assessment of your grounds first, then decide.
— George
How Simons George Legal can help you contest a will
Simons George Legal is a Bondi-based wills and estates practice with deep experience in contested will matters and estate litigation across Sydney. The firm acts for challengers and defenders alike, building tailored strategies around the specific grounds and evidence available in each matter.
Whether your concern involves testamentary capacity, undue influence, or a suspected forgery, Simons George Legal provides clear advice on your prospects and a cost structure designed to keep litigation proportionate. The firm’s estate litigation team handles everything from initial evidence gathering through to court proceedings and negotiated settlements.
New clients receive a complimentary 30-minute consultation. Contact Simons George Legal to discuss your matter and understand your options before time limits close.
FAQ
What are valid reasons to contest a will in Australia?
The legally recognised grounds include lack of testamentary capacity, undue influence, improper execution, fraud, forgery, and lack of knowledge and approval. Feeling that a will is unfair or unexpected does not constitute a valid ground on its own.
Can I contest a will if the deceased had dementia?
A dementia diagnosis does not automatically invalidate a will. Courts assess testamentary capacity at the precise moment of signing, and a person can validly execute a will during a lucid interval even if they had a cognitive condition.
How long do I have to contest a will in NSW?
Family provision claims in NSW must generally be filed within 12 months of the date of death. Challenges to the validity of a will should be brought as early as possible, ideally before probate is granted.
How difficult is it to prove undue influence?
Proving undue influence is one of the hardest grounds to establish because direct evidence rarely exists. Courts rely on circumstantial evidence such as isolation of the testator, the influencer’s involvement in drafting the will, and sudden unexplained changes to earlier wills.
What happens if I successfully contest a will?
If a will is declared invalid, the court will either apply an earlier valid will or distribute the estate according to the rules of intestacy. The specific outcome depends on which ground succeeded and whether any prior valid will exists.