King Charles III. he is the first monarch in UK history to file a tax return. It implies that his son, Prince William, is wealthier than himself. The net worth of the Duchy of Cornwall, which William inherited after his appointment as Prince of Wales, is £1.2 billion (around €1.4 billion).
The tax return also revealed for the first time how much the future British king paid in taxes. For the tax years 2023/24 and 2024/25, he paid a total of £16.1 million (approximately €18.8 million) in income and capital gains tax. Since becoming Prince of Wales, according to published figures, he has already paid more than £20 million (about €23.4 million) in taxes.
The latest accounts show that in the financial year 2025/26, William had a private income of £21.6m (around €25.3m) from his dukedom. For comparison, the personal property of King Charles III. estimated by the Sunday Times Rich List at 640 million pounds (approximately 749 million euros).
At the same time, it was revealed that William had decided to give up the income from the lease of Dartmoor Prison. From the financial year 2026/27, he no longer wants to receive an annual rent of £1.5m (around €1.75m). This money is instead intended to support the recovery of the local community.
“Prince William recognizes that for many residents of Princetown, the prison has been an integral part of the local community for many years. Its closure has brought real uncertainty not only in terms of jobs and business, but also for the future of the town as a whole. The Duke believes that as long as these issues remain unresolved, the benefit of this revenue should remain in the local community and help its residents shape its future.” said the prince’s private secretary, Ian Patrick.
