Prince William and Kate Middleton's annual income from the Duchy of Cornwall for the 2024-2025 financial year was approximately £30.9 million. This income, derived from the historic estate worth over £1 billion, is utilized for official duties, private expenses, and supporting their three children. William inherited the Duchy, established in 1337 to fund the monarch's eldest son, when his father became King Charles III in 2022. The couple will also assume new responsibilities as Grantors of Royal Warrants in 2026.