Throughout his legal career, Jinnah practised probate law (with many clients from India's nobility), and in 1911 introduced the Wakf Validation Act to place Muslim religious trusts on a sound legal footing under British Indian law.
Sepanjang karier hukumnya, Jinnah mempraktikan hukum probate (dengan beberapa klien dari kalangan bangsawan India), dan pada 1911 memperkenalkan Undang-Undang Validasi Wakaf demi mendapatkan kepercayaan Muslim pada peletakan penyuaraan hukum di bawah hukum India Britania.