"King Charles III will release his own personal tax bill, becoming the first sovereign to do so. The move is an effort to improve transparency around royal finances, and the release has been ordered by the King himself. It comes as his royal household seeks to increase “clarity and accessibility” around the monarchy’s finances by producing a new report on the subject. His son,William, the Prince of Wales, meanwhile, has not disclosed the tax he has paid since becoming heir to the throne.

The release will give people an insight into the monarch's annual earnings. It could include the King's private sources of income, such as investments or trading profits, funds generated by his private estates of Balmoral and Sandringham and private savings. The King also earns money from the Duchy of Lancaster estate, which is a private portfolio of land, investments and office, retail and industrial properties. In 2024/2025, it earned him £26.8million."



https://www.express.co.uk/news/royal/2219885/king-Charles-release-personal-tax-return