How Mental Capacity Impacts the Legal Defence of a Will in Perth

December 22, 2025    Deceased Estate Lawyers Perth
How Mental Capacity Impacts the Legal Defence of a Will in Perth

When someone near and dear dies, there’s no denying that sorrow and remorse get the better of us. Handling legal cases and solving will disputes is clearly not in someone’s mind. It is known that in the event of a loved one dying, there should be a will that reflects what they wanted after their demise. However, what would be the case when somebody says that the maker of the will was not of sound mind during the time of its creation?

In Perth as well as in Australia, mental capacity is a very decisive factor in defending or challenging a will. Keep reading as we will share everything about mental capacity, how it affects the legal defence of a will, and whether the decision to hire deceased estate lawyers in WA can to defend their last wish.

What Is Mental Capacity?

Mental capacity implies that an individual has the capacity to comprehend the actions they are performing in making a legal or financial decision.

In the case of a will, the person (the testator) must clearly comprehend:

  • What a will is and its effects.
  • What are their property and assets?
  • Who can claim their estate morally or legally?

Failure to have this understanding has the power to make a will invalid.

Why Mental Capacity is Important in Will Disputes

Among the most frequent reasons that result in a will being challenged is the absence of testamentary capacity. This occurs when a person argues that the testator did not actually understand what they were signing.

Courts do not take these claims lightly, especially when the individual was old, sick or under medication that may influence judgment. Defending a claim in Perth becomes complicated when mental capacity is doubtful.

The Legal Test of Testamentary Capacity

The Australian law is based on a 19th-century legal principle of a case, Banks v Goodfellow (1870). As per this test, an individual has to:

  • Know what the will is and what its impact is.
  • Be acquainted with the general dimensions of their property.
  • Identify people who are likely to gain access to their estate.
  • Has to be of sound mind and not have any mental disorders that influence decision-making.

In Perth, this criterion remains in use by the courts in determining capacity.

How Capacity Is Determined

Evidence is important when a conflict arises. Medical history, witness testimonies and solicitors’ notes will be examined by the judges to decide whether the will-maker was mentally competent. Doctors or psychiatrists often have a lot of weight on their medical evidence.

The fact that the person had understood instructions can be demonstrated by the notes made by lawyers during the signature of the will. The behaviour and the way the individual was speaking and acting can also be confirmed by the witness accounts. All these works assist the court to determining whether the testator was of capacity.

Common Signs of Questionable Capacity

The mental ability may be influenced by a number of conditions, such as:

  • Dementia or Alzheimer’s disease.
  • Stroke or brain injury.
  • Extreme depression or mental illness.
  • Powerful drug or alcohol consumption.

Such warning signs include confusion of the assets, forgetting of family members or sudden, unusual changes to their will. Lawyers normally advise a medical examination prior to the signing of the will when these signs exist.

What is the most likely time that capacity is going to be challenged?

Disputes often arise when:

  • Close family members are strangely left out of the will.
  • Before death, a new will is drawn up.
  • The boundsman was extremely dependent on an individual.
  • The will was not drawn up by a lawyer.

This may create a question of doubt on mental ability.

Defending a Will When Capacity Is Questioned

In defending mental capacity issues in Perth wills, preparation and evidence are important, especially in Perth. Here’s what usually helps:

  • Collect the medical history of the individual, proving that he was sane at the time.
  • Get a testimony from the lawyer who made the will.
  • Get people who observed the will-maker to have acted rationally.
  • Be consistent with the past versions of the will; if it is the same as the previous versions, the will stands a minimal chance of being challenged.

The more the paperwork, the better the defence.

When to Seek Legal Advice

You should seek the services of a deceased estate solicitor Perth in contested wills in case you suspect that a will was created when the person was not fully mentally sound, or you need to defend one. They can:

  • Examine the materials and evidence.
  • Give suggestions on how successful you are likely to be.
  • Defend you during mediation or court.
  • Early advice can save time, money and emotional agony.

Wrapping Up

The central point of every valid will is mental capacity. The courts in Perth and the rest of Australia would prefer to see that a will is actually what an individual wanted to be. Without that understanding, conflicts are bound to occur.

The ultimate insurance is planning, effective communication, medical verification and professional services by defending a will lawyer in Perth. In such a manner, you protect the wishes of your beloved and ensure that their legacy is preserved.

REQUEST A QUOTE NOW! Complete the form below for a fast response


Copyright © Deceased Lawyers Perth.
All Rights Reserved
Powered by Inausco Digital
Enquire Now
Call Us Now