Queensland Will Disputes: Challenging a Will for Undue Influence or Lack of Capacity

By James Stevens, Director and Solicitor, Go To Court Lawyers. Last reviewed 10 April 2026.

Challenging a Will in Queensland - Undue Influence or Lack of Capacity Claims

You can challenge a will in Queensland's Supreme Court if someone pressured the deceased into changing it (undue influence) or if the deceased lacked the mental capacity to understand what they were doing when they signed it. These are serious legal challenges that require strong evidence and must be filed within 9 months of probate being granted. Time limits are strict - if you suspect undue influence or lack of capacity, you need legal advice immediately to protect your rights.

Do You Need a Lawyer?

Yes, you absolutely need specialist legal representation for will disputes in Queensland. The Supreme Court requires detailed affidavit evidence, expert medical testimony, and complex legal arguments that self-represented litigants cannot effectively present.

Without a lawyer, you risk having your case struck out for failing to meet procedural requirements, missing critical evidence deadlines, or incorrectly pleading your case. Queensland's Supreme Court sees hundreds of will disputes annually - judges expect professional representation and detailed legal submissions.

A specialist will dispute lawyer can subpoena medical records, engage handwriting experts, obtain witness statements, and present your case according to established legal precedents. They can also identify whether you have stronger claims under family provision legislation or whether multiple claims should be combined for maximum impact.

The other side will have lawyers - you need equal representation to protect your inheritance rights.

What Happens Next - The Supreme Court Process

1. Evidence gathering (1-3 months): Your lawyer obtains the deceased's medical records, identifies potential witnesses, and reviews the circumstances surrounding the will's creation. This includes subpoenaing GP records, specialist reports, and any nursing home documentation.
2. Filing the challenge (within 9 months of probate): Your lawyer files an Originating Application in Queensland's Supreme Court, clearly stating whether you're challenging based on undue influence, lack of testamentary capacity, or both.
3. Respondent's defence (28 days): The executor or beneficiaries file their response, often claiming the will is valid and seeking to have your challenge dismissed.
4. Affidavit evidence (2-6 months): Both sides file detailed sworn statements with supporting documents. This includes medical expert reports, witness statements, and documentary evidence about the deceased's mental state.
5. Expert medical assessment: If challenging capacity, your lawyer engages a specialist psychiatrist or geriatrician to review all medical evidence and provide an expert opinion on the deceased's mental state.
6. Mediation attempt (court-ordered): The Supreme Court typically orders mediation before trial. Many will disputes settle at this stage when faced with strong evidence.
7. Trial preparation (2-4 months): If mediation fails, your lawyer prepares detailed legal submissions, organizes witness testimony, and prepares you for cross-examination.
8. Supreme Court trial (1-5 days): A judge hears all evidence and legal arguments. The court makes a final determination on whether the will is valid or should be set aside.

Time limits are critical - you must act within 9 months of probate being granted, or risk losing your right to challenge forever.

The Law in Queensland

Will challenges in Queensland are governed by the Succession Act 1981 (Qld) and heard exclusively in the Supreme Court of Queensland. The key legal tests are well-established but require expert presentation.

Undue Influence Legal Test

Under Queensland law, undue influence means coercion that overpowered the deceased's free will when making their will. The court applies the test from Wingrove v Wingrove - you must prove the influence was so strong it prevented the deceased from exercising independent judgment.

Undue influence is different from mere persuasion or family pressure. The law recognizes that family members naturally influence each other. You must prove active coercion, threats, or manipulation that dominated the deceased's decision-making.

Lack of Testamentary Capacity

The legal test comes from Banks v Goodfellow (1870), still applied in Queensland today. The deceased must have understood:

• The nature and effect of making a will
• The extent of their property
• The moral claims upon them (family members who might expect to inherit)
• How these factors relate to each other in disposing of their property

The law presumes mental capacity unless proven otherwise. However, if the deceased had dementia, mental illness, or was taking medication affecting cognition, the burden shifts to those supporting the will to prove capacity existed.

Difference from Family Provision Claims

These challenges are completely different from family provision claims under the Succession Act 1981 (Qld). Will challenges argue the will itself is invalid. Family provision claims accept the will is valid but argue eligible family members received inadequate provision.

You can run both claims simultaneously - challenging the will's validity while also seeking better provision under family provision legislation.

Mistakes to Avoid

1. Waiting Too Long to Challenge

The most devastating mistake is missing the 9-month deadline after probate is granted. Unlike family provision claims which have 12 months, will challenges have shorter time limits. Once this deadline passes, you generally cannot challenge the will regardless of how strong your evidence is.

2. Confusing Undue Influence with Family Pressure

Many people believe any family influence constitutes undue influence - this is wrong. Queensland courts recognize that family members naturally influence each other's decisions. You need evidence of active coercion, threats, isolation from other family members, or manipulation of a vulnerable person. Simply being close to the deceased or persuading them to change their will is not enough.

3. Failing to Obtain Medical Records Early

Medical evidence is crucial for capacity challenges, but hospitals and GPs destroy records after certain periods. If you wait too long, critical evidence may be lost forever. GP records, specialist reports, hospital admissions, and medication records all provide vital evidence about the deceased's mental state.

4. Assuming Dementia Automatically Means Lack of Capacity

Queensland law recognizes that people with dementia can have "lucid intervals" where they understand their decisions. A dementia diagnosis alone doesn't invalidate a will - you must prove the deceased lacked capacity at the specific time they signed the will. This requires detailed medical analysis of their condition's progression.

5. Not Considering Alternative Claims

Sometimes what appears to be undue influence is better argued as a family provision claim, or vice versa. Experienced lawyers assess all possible claims and choose the strongest legal strategy. Running the wrong type of claim can result in complete failure even with good facts.

These mistakes can destroy otherwise strong cases - get specialist advice immediately to avoid costly errors.

Likely Outcomes and Costs

What Success Looks Like

If your undue influence claim succeeds, the court sets aside the invalid will entirely. This typically means the previous valid will takes effect, or if none exists, the deceased's estate is distributed according to intestacy laws.

For lack of capacity claims, the court declares the will invalid and either validates an earlier will or applies intestacy distribution. The court can also find part of a will invalid while upholding other parts.

With specialist legal representation, strong will challenges succeed approximately 60-70% of the time when they reach trial. However, many settle during mediation once the other side sees compelling evidence.

Legal Costs

Will dispute costs in Queensland's Supreme Court typically range:

• Straightforward challenges: $25,000 - $50,000 in legal fees
• Complex cases requiring multiple experts: $50,000 - $100,000+
• Trial proceedings: Additional $15,000 - $30,000 for court preparation and trial advocacy

Most will dispute lawyers offer cost agreements limiting your exposure. If you win, you may recover legal costs from the estate. If you lose, you typically pay the other side's costs unless the court orders otherwise.

Timeframes

Queensland will disputes typically take 12-24 months from filing to resolution. Complex cases involving multiple medical experts or extensive discovery can take longer. Cases that settle at mediation resolve in 6-12 months.

The sooner you start, the better your chances of success and the lower your legal costs will be.

How Go To Court Lawyers Can Help

Go To Court Lawyers has specialized in will disputes across Queensland for over 13 years. Our estate litigation team has successfully challenged hundreds of wills in Queensland's Supreme Court, recovering millions in inheritance for families facing undue influence and lack of capacity situations.

Our Queensland will dispute lawyers provide:

• Immediate case assessment: Fixed-fee consultation to evaluate your claim's strength and identify the best legal strategy
• Expert medical networks: Direct access to specialist psychiatrists, geriatricians, and neurologists who provide court-ready capacity assessments
• Supreme Court experience: Our lawyers appear regularly in Queensland's Supreme Court and understand judicial expectations for will dispute evidence
• Cost-effective representation: Transparent fee structures and cost agreements that protect you from unexpected legal bills
• 24/7 availability: Urgent legal advice when you discover concerning circumstances about a loved one's will

With 800+ lawyers nationally and a 4.5-star rating from 780+ reviews, Go To Court Lawyers delivers results when your inheritance is at stake.

Don't let undue influence or lack of capacity invalidate your loved one's true wishes. Queensland's strict time limits mean every day counts when challenging a will.

Call 1800 577 015 now for urgent will dispute advice, book your consultation online at gotocourt.com.au/book, or request immediate help through our 24/7 contact system. Your inheritance rights depend on acting quickly.