Definition
The Thellusson Act is a popular name for the English statute 39 & 40 Geo. III, c. 98 (1800), which prohibited the settlement of property so as to accumulate income beyond certain specified periods. The Act was passed in direct response to the will of Peter Thellusson, a wealthy merchant banker who died in 1797 leaving a trust designed to accumulate his estate's income across multiple generations until the death of his last surviving descendant born before his death — at which point the accumulated fund, projected to be enormous, would pass to the heirs. Parliament moved quickly to prevent similar instruments from being executed in the future, and the resulting statute became known by his name.
The Act operates as a companion restriction to the Rule Against Perpetuities. Where the Rule Against Perpetuities limits how far into the future a property interest may vest, the Thellusson Act limits the period during which income may be directed to accumulate rather than be paid out to beneficiaries. Trusts or will provisions directing accumulation beyond the permitted period are void as to the excess; the income must instead pass as though no accumulation had been directed.
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Common Confusion
The Thellusson Act is frequently conflated with the Rule Against Perpetuities, but the two address distinct problems. Perpetuities law governs when future interests in property must vest; the Thellusson Act governs the accumulation of income. A trust could theoretically satisfy the Rule Against Perpetuities and still violate the Thellusson Act, or vice versa. Researchers analyzing accumulation trusts must examine both bodies of law independently.
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Why It Matters in Research
The Thellusson Act is an English statute with a specific and narrow scope, but it casts a long shadow in legal history research for several reasons.
First, the Act applies only to England and Wales, and its direct force does not extend to other common law jurisdictions. American jurisdictions developed their own accumulation restrictions — sometimes statutory, sometimes through judicial application of perpetuities principles — and those rules do not always track the English model. Researchers working on late 19th and early 20th century American trust law must be cautious not to treat Thellusson Act doctrine as universally applicable. Look for jurisdiction-specific accumulation statutes rather than assuming the English framework governs.
Second, the Act was the product of a specific historical moment — Thellusson's will generated enormous public anxiety and Parliamentary debate — and historical sources treat it heavily in that narrative context. Treatises on trusts from the Victorian period often discuss the Act at length, but their analysis can be colored by the drama of the Thellusson case itself rather than providing neutral doctrinal guidance.
Third, because both Rapalje & Lawrence and Anderson's treat this entry briefly or incompletely — Rapalje & Lawrence gives only the statutory citation and a bare description, while Anderson's entry appears to have been truncated and cross-references accumulation without completing its own definition — researchers relying solely on these dictionaries will find little substantive guidance. The entries confirm the term's existence and statutory identity but do not explain operation, permitted periods, or consequences of violation. Fuller treatment requires recourse to 19th century equity treatises, particularly English works on trusts and executorship.
Fourth, the Thellusson case itself (Thellusson v. Woodford) was litigated extensively before the Act passed and continued to be cited in accumulation cases well into the 19th century. A researcher encountering the case citation in historical materials should understand it as the origin event, not as controlling precedent for post-Act analysis.
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Historical Dictionary Support
Rapalje & Lawrence identify the Act correctly as 39 & 40 Geo. III, c. 98 and characterize its function — forbidding accumulation of income beyond certain named periods — with accuracy but no elaboration. The entry contains no discussion of what those periods are, what consequences attach to violation, or how the Act interacts with perpetuities doctrine. It is a signpost, not a guide.
Anderson's Dictionary of Law appears to have suffered a typographical or editorial failure at this entry: the text shifts mid-entry to a definition of "Thief" and a marine insurance policy question, with the Thellusson Act referenced only in a truncated cross-reference to "ACCUMULATION." This is an unreliable source for this term and should not be cited for substantive content.
Neither historical dictionary addresses the Act's legislative history, the Thellusson litigation that prompted it, or the American reception question. Both sources agree on the statutory identity of the Act. Beyond that, the historical dictionaries are thin, and researchers should treat them as confirmation of the Act's existence rather than analysis of its operation.
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Jurisdictional Note
The Thellusson Act is English legislation and applies as such to England and Wales. Several American states enacted their own statutory restrictions on accumulations in the 19th century, drawing on but not replicating the English model. Scottish law developed separately under the Accumulations Act 1800, which was substantially similar. Canadian and Australian jurisdictions similarly developed distinct accumulation rules. Research into accumulation trust problems outside England requires independent jurisdictional analysis.
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Encyclopedia Cross-Reference
See Law Mind Encyclopedia: Accumulations, Rule Against; Perpetuities, Rule Against; Trusts, Restraints on
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