Lim made his political debut in the
1997 general election as part of a five-member PAP team contesting in
Tanjong Pagar GRC, led by Prime Minister
Lee Kuan Yew and was elected in a walkover. He was on the PAP's team in
Holland–Bukit Panjang GRC at the
2001 general election, and in
Holland–Bukit Timah GRC at the
2006 general election, and was elected unopposed on both occasions. At the
2011 general election, Lim stood in
East Coast GRC, where the PAP's team defeated the team from the opposition
Workers' Party by 59,992 votes (54.8%) to 49,429 (45.2%). Lim served as Deputy Secretary-General of the
National Trades Union Congress (NTUC) from 1997 to 1999. He also served on the Committee on Singapore's Competitiveness from 1997 to 1998, and chaired its Sub-committee on Manpower Development. In 1999, Lim was appointed as
Minister of State for Trade and Industry and
Minister of State for Information, Communications and the Arts. Lim was made a member of the PAP's
Central Executive Committee in 1999 and served as the chairman of the party's
youth wing between 2000 and 2004. Lim was made the Acting Minister for the Environment on 1 October 2000. He became a full minister of the
Cabinet on 23 November 2001.
Minister in Prime Minister's Office (2004–2015) On 12 August 2004, Lim was appointed a Minister in the Prime Minister's Office. He also served as the Second
Minister for National Development from 12 August 2004 to 29 May 2006. In 2005, Lim became the Deputy Secretary-General of the NTUC for the second time (while continuing to serve concurrently as a Minister without portfolio in the Prime Minister's Office). In 2007, he was made the Secretary-General of the NTUC. In 2014, Lim appeared on Singapore's
Mediacorp Channel 8 episode "Hear Me Out", to respond to the criticisms against him and clarify himself on a few topics such as his Zorro costume, "Cheaper Better Faster", "Better, Betterer, Betterest", "Deaf Frog" and why Singapore implements
Progressive Wage Model instead of
minimum wage.
Minister for Manpower (2015–2018) On 4 May 2015, Lim relinquished his post of Minister in Prime Minister's Office and NTUC secretary-general (in line with the NTUC's retirement policies) and was appointed the Minister for Manpower. Lim retired from the cabinet on 1 May 2018, with his Manpower portfolio succeeded to
Josephine Teo. On the same day, he was appointed to NTUC as trustee of NTUC and chairman of NTUC Administration and Research Unit (ARU) Board of Trustees replacing his predecessor
Lim Boon Heng. On 5 May, Lim was awarded the Distinguished Comrade of Labour during the May Day Awards ceremony.
Retirement from politics In 2020, Lim announced that he would be retiring from politics, and not stand for the
2020 general election. In 2021, he was appointed as an independent director in Singtel. ==Personal life==