Much litigation in the United Kingdom and elsewhere could be avoided if doctors correctly assessed the capacity of a person to make a will. An old age psychiatrist and a solicitor explain how to assess capacity using legal tests
Dementia and personal wealth are both increasing. This has led to more wills being contested after a testator's death. Solicitors often adhere to the “golden rule” by asking doctors to certify testamentary capacity (capacity for making a will) in potential testators. We discuss possible pitfalls in this situation and offer advice on how to proceed.
The policies of former UK prime minister Margaret Thatcher led to an increase in property ownership in the UK. Given the steep rise in house prices in Britain since she left office, more people now have substantial estates to bequeath. Alongside this trend has been an increase in the proportion of older people in the population, resulting in a growth in the prevalence of dementia. Dementia and will making are awkward bedfellows. This would scarcely be a problem if people were to make wills before reaching old age, but this often does not happen, and a growing number of wills are challenged after the testator's death.
Much litigation could be avoided, however, if doctors, when asked by solicitors, assessed testamentary capacity correctly.
Defining testamentary capacity
The most important fact about capacity is that it is task specific. Incapacity to manage one's financial affairs does not necessarily imply, for example, incapacity to donate power of attorney. The leading authority on testamentary capacity is the judgment in the case of Banks v Goodfellow. 1 This judgment remains the test in most common law jurisdictions today and is stated thus:
“It is essential. that a testator  shall understand the nature of the act [of making a will] and its effects;  shall understand the extent of the property of which he is disposing;  shall be able to comprehend and appreciate the claims to which he ought to give effect; and, with a view to the latter object, [and]  that no disorder of the mind shall poison his affections, pervert his sense of right, or prevent the exercise of his natural faculties; that no insane delusion shall influence his will in disposing of his property and bring about a disposal of it which, if the mind had been sound, would not have been made” (see summary in box 1).