Capacity to make a Will and its effects
Capacity to make a Will is one of the key conditions necessary for the validity of a will. One’s capacity to make a Will is determined from their legal and mental capacity.

Legal Capacity to make a Will
Under Common law, the legal and mental capacity of someone to make a Will is referred to as testamentary capacity. Looking at the legal capacity, the convention or general rule applicable is that only adults can make a Will. The exception to the above rule is a privileged Will. A privileged will allows members of the Military who are below the age limit of adulthood (below 18 years). Usually, a person below 18 cannot make a will, but when such a person is a member of the Military and in ‘warlike’ situation makes a Will, such a Will is valid. However, it is not necessary that such a Will must be witnessed by two persons. The usual formalities in making a will are dispensed with.Mental Capacity to make a Will
We must also consider the mental state of the testator. A person is said to mental capacity to make a will, when he is corpus mentis, that is, has a sound and disposing mind at the time he gave instructions, and at the time he executed the Will. A person is said to have mental capacity as laid down in Banks v. Goodfellow. It was held that what constitutes a sound and disposing mind is a question of fact, that a person who can converse rationally and conduct his business is not sufficient to prove mental capacity. The most prominent issues of incapacity arise from unsound mind, senility, drunkenness and undue influence. The propounders of a Will has to prove that the testator’s had mental capacity where it becomes an issue. The following tests were put forward in the judgment by Cockburn C.J., in the case of Banks v. Goodfellow (supra) –- The testator must understand the nature of the act and its effects as regards making the will.
- He must understand and recollect the extent of the property he intends to dispose of.
- He must understand and appreciate the nature and extent of the claims upon him as regards to those he intended to distribute his property to.
- Further to the above point, the manner in which the property is distributed must be rational that no disorder of the mind has poisoned his affection or perverted the exercise of his will
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