U.K. — King Charles's personal tax information for the 2024-25 financial year will be published next week, making him the first head of state to reveal his personal tax bill. A new royal household report on the monarch's finances will also be published next week, alongside accounts detailing the sovereign grant and the Duchy of Lancaster's accounts at a press briefing during the same period.

The Duchy of Lancaster estate provides the King with an annual income, from which he received £26.8m in the 2024-25 financial year. The King voluntarily pays income tax on all his private income and capital gains tax on relevant elements of his assets. This practice follows the Memorandum of Understanding on Royal Taxation 2023, which was agreed by the government.

The private sources of income for King Charles could include funds from investments or trading profits, money generated by his private estates of Balmoral and Sandringham, and private savings. King Charles is 77 years old.

A Buckingham Palace spokesperson said, "While this is the first time a monarch has shared this personal tax information, you may recall it was similarly released by His Majesty when he was Prince of Wales." The spokesperson added, "The decision to do so as sovereign has come at the express wish of the king himself, as part of the adaptations carried across since accession." King Charles's 2025-26 tax details will be released next year after the audit is completed.

No independent assessment of King Charles’s claims was available.