In 2023, Kerr was selected as the Scottish Conservative candidate for the new UK Parliament Angus and Perthshire Glens constituency, for the forthcoming 2024 United Kingdom general election.

His role immediately prior to his election involved heading the sales teams for Kimberly Clark in the UK, Ireland and France.

[6] Kerr signed a letter to the Prime Minister on 16 February 2018, making suggestions about the way Britain should leave the European Union.

In July 2018, Kerr unveiled replicas of the John Allan Stones at the Stirling Smith Art Gallery and Museum.

[11] Upon his election, he was given the role of Chief Whip for the Scottish Conservatives in Holyrood, replacing Miles Briggs.

[12] On the 28 May, Kerr used his maiden speech to urge the Cabinet Secretary for Health, Humza Yousaf, to speed up rollout of the COVID-19 vaccine.

[18] Kerr caused controversy on 14 April 2023 in a now deleted tweet when he suggested transgender people have learning disabilities and has since apologised.

[20] Kerr highlighted the rise in violent attacks in the classroom, successfully persuading the Government to hold a national discussion to address this problem.

[22] On 14 August 2024, Kerr accidentally published doubts about his endorsed candidate Murdo Fraser in the leadership election as a status update on WhatsApp.

[23] As of October 2024, Kerr is a member of the Constitution, Europe, External Affairs, and Culture Committee at Holyrood.