How much does the British Royal Family cost taxpayers? King Charles' £137.9m grant, William's wealth

How much does the British Royal Family cost British taxpayers, and how wealthy are King Charles III and Prince William? A new UK Parliament briefing on royal finances has revealed how public money supports the monarchy, while also explaining the income generated by historic royal estates and the tax arrangements followed by senior members of the family.

The Sovereign Grant, which funds the King's official duties, stands at £137.9 million for 2026/27. However, the government has proposed reducing it to £99.9 million in 2027/28 following the completion of the Buckingham Palace refurbishment.Meanwhile, a report by The Mirror has drawn attention to Prince William's financial position, including the £1.2 billion valuation of the Duchy of Cornwall and his reported £21.6 million income in 2025-26.

King Charles, meanwhile, has an estimated personal fortune of £640 million, according to the Sunday Times Rich List.