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Sui juris meaning

What does Sui juris mean?
Sui juris describes a person who can make binding legal decisions and transactions in their own right — able to contract, hold and dispose of property, sue and be sued, and instruct legal advisers — because they have full legal capacity. It is a descriptive Latin expression, not generally a defined statutory term, and is used across litigation, trusts and estates, and conveyancing (for example, a beneficiary or party who is sui juris can consent without a guardian or court approval). Usage is consistent across the UK and Ireland and aligns with each jurisdiction’s rules on age and mental capacity. In England and Wales, adults aged 18 with decision‑specific capacity under the Mental Capacity Act 2005 are sui juris; minors and those who lack capacity act through a representative (such as a litigation friend, attorney or court‑appointed deputy). In Scotland, legal capacity arises at 16 under the Age of Legal Capacity (Scotland) Act 1991, subject to the Adults with Incapacity (Scotland) Act 2000. In Northern Ireland, the age of majority is 18; capacity is addressed by the Mental Capacity (Northern Ireland) Act 2016. In Ireland, full age is 18 and capacity is governed by the Assisted Decision‑Making (Capacity) Act 2015.
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View the related Practice Notes about Sui juris

PRACTICE NOTES
Variation of Scottish trusts: common law, court-sanctioned arrangements and statutory powers (1921, 1961, 2024), including alimentary liferents, beneficiary approvals, procedure, divorce, and public/charitable cy-près and OSCR reorganisations

FORTHCOMING CHANGE : The Trusts and Succession (Scotland) Act 2024 obtained Royal Assent on 30 January 2024, representing the first comprehensive re-examination of Scottish trust law in more than a century, since the cornerstone Trusts (Scotland) Act 1921 was enacted. As regards trusts, a substantial proportion of its provisions will only operate once Scottish Ministers make further secondary legislation to commence them. By contrast, most succession provisions took effect on 30 April 2024, with a handful of minor trust-related points commencing on 26 June 2024. See News Analysis: Trusts and Succession (Scotland) Bill passed. Practice Notes dealing with Scottish trusts and succession will be updated further to reflect, and align with, this new legislation. At common law, once a trust has taken effect, the scope to vary its terms or purposes is very narrowly confined. Where an inter vivos trust is revocable, the truster may adjust its terms at any time, provided they are sui juris. However, the majority of inter vivos trusts are irrevocable once the trust has...

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PRACTICE NOTES
Disclaimers and acceptance of testamentary and intestate entitlements: legal limits, consequences, joint beneficiaries and tax (England and Wales)

The refusal of a gift before it is accepted is known as a disclaimer. Freedom to disclaim The law does not oblige a beneficiary to accept a testamentary gift against their wishes. A beneficiary is at liberty to decline a gift if they choose. As Abbot CJ observed in Townson v Tickell, the law is not so absurd as to compel someone to take an estate against their Will. Although any estate, whether given by Will or otherwise, is presumed to benefit the recipient, he is the best judge; if he decides it is not beneficial, the law will, by some means, permit him to renounce or refuse it. A beneficiary may disclaim by: in writing by deed by conduct Retracting a disclaimer For a person sui juris, a disclaimer is ordinarily final; a disclaimer executed by deed binds the maker as any other deed would. It has been held, however, ...

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