King Charles III will publicly disclose his personal tax details for the 2024-2025 fiscal year on Thursday, becoming the first British sovereign to break with a centuries-old tradition of financial secrecy. Buckingham Palace confirmed the decision to the Press Association, describing it as an express wish of the King to “further enhance clarity and accessibility” while situating royal finances within their “historical and constitutional context.” The move comes as the monarchy faces intensified parliamentary and public examination of its financial arrangements, triggered in part by controversies linked to Prince Andrew’s use of subsidised properties.

Under British law, the monarch is legally exempt from paying income tax, capital gains tax, and inheritance tax on assets inherited from a predecessor. Since 1993, however, sovereigns have voluntarily paid income and capital gains taxes—a practice initiated by the late Queen Elizabeth II. Charles III has continued this voluntary arrangement, as codified in a 2023 memorandum on royal taxation. His private income derives largely from the Duchy of Lancaster, a portfolio of land and investments that generated £26.8 million in the latest fiscal year. In addition, the Sovereign Grant—the annual government allocation for official duties—amounted to £132 million for 2025-26. The Treasury does not oblige disclosure of individual tax liabilities, making this week’s release a departure from historical practice.

Buckingham Palace has framed the disclosure as part of a wider modernisation agenda pursued since Charles’s accession in 2022. Observers in London note that the timing coincides with a period of reputational vulnerability for the House of Windsor. A parliamentary public accounts committee opened an inquiry last year into the granting of residential properties to royals, following revelations that Prince Andrew had earned private income by subletting cottages while paying only a symbolic rent on a mansion for over two decades. The King had previously made his tax affairs public during his tenure as Prince of Wales; the extension of this practice to his role as monarch is presented as a personal initiative intended to reinforce accountability. By contrast, his son and heir, Prince William, does not disclose his tax payments, though he voluntarily pays the highest income tax rate on revenues from the Duchy of Cornwall.

The publication of the King’s tax bill on Thursday is expected to provide concrete figures on his voluntary contributions, feeding into ongoing debates over the monarchical privilege of tax exemption. European analysts view the step as consistent with a secular trend among hereditary institutions toward greater financial openness—a trend also visible in the voluntary tax contributions of some continental royal houses. The Buckingham Palace spokesperson said that the 2025-26 fiscal data would be released next year following audit completion, indicating that the practice will become an annual feature. For now, the dossier remains under close watch by both Westminster and the broader public.