Thomas received livery of his father's lands at age 21 on 10 November 1408, and was summoned to parliament from 1 December 1412 as 'Thomas Dacre of Gillesland' (Gisland). He held the office Chief Forrester of Inglewood Forest.
This event marked a significant milestone in Thomas's life when he received his father's lands at age 21 on November 10, 1408. Two years later, he was formally invited to attend parliament as 'Thomas Dacre of Gillesland' (Gisland) from December 1, 1412. He also held the position of Chief Forrester of Inglewood Forest.