Upon graduation in 1970, Lim joined
Neptune Orient Lines (NOL) as a naval architect. Lim was assigned overseas twice to supervise the construction of NOL's new ships - Denmark (1972–1974) and Japan (1976–1977). He was promoted to Manager of Corporate Planning in 1978, while concurrently holding the post of Manager of Liner Services.
Political career Lim was approached by former NOL colleague
Goh Chok Tong to contest in the
1980 general election. Lim contested in the
Kebun Baru SMC and was later elected the
Member of Parliament (MP) for Kebun Baru (1980–1991). In 1984, Lim raised the concept of
town council, and was appointed the chairman of Ang Mo Kio West Town Council, the first in the country, in 1986. He was the MP for the Ulu Pandan division of
Bukit Timah GRC (1991–2001) and the Jurong Central division of
Jurong GRC (2001–2011). Lim was Chairman of the Government Parliamentary Committee (GPC) for Labour (1987–1991) and Deputy Speaker of Parliament (1989–1991). Lim was appointed Senior Minister of State for the Ministry of Trade and Industry in 1991 and later became the Second Minister for the same ministry in 1993. In October, Lim was appointed as Minister without portfolio in October 1993 (later renamed as Minister in the Prime Minister's Office). In 1996, he was the Treasurer of the PAP Central Executive Committee and went on to become the Chairman of the PAP Central Executive Committee in 2004. In 2007, Lim was appointed Chairman of the Ministerial Committee on Ageing to oversee issues related to Singapore's rapidly ageing population. Lim announced his retirement from politics in 2011 before the general elections. Lim teared up while responding to the media on whether there was
groupthink among PAP politicians. He recounted how the Cabinet was deeply split over whether to set up a casino in Singapore and his struggle with the decision.
Trade union career Lim has a long career with the
trade union in Singapore. He spent 26 years at the National Trades Union Congress, with the last 13 as its Secretary-General. He rose from the position of Deputy Director (1981–1983) to Assistant Secretary-General (1983–1987) and Deputy Secretary-General (1987–1991). Thereafter, he had a two-year stint at the
Ministry of Trade and Industry (1991–1993). Upon his return to the NTUC, he was elected Secretary-General and served for another four terms until he stepped down in December 2006 to make way for
Lim Swee Say. Lim is Chairman of NTUC Eldercare since 2000 and Deputy Chairman of
Singapore Labour Foundation since 1997. Following his retirement from NTUC, Lim helps to oversee the labour movement's network of nine cooperatives. He is currently Chairman of the Social Enterprises Development Council. Lim served as a member on the National Wages Council from 1981 to 1991. Lim was instrumental in pushing for a flexible wage system to help older workers keep their jobs and to preserve jobs during difficult economic times. Lim was able to persuade union leaders to support the
Central Provident Fund (CPF) cuts and reform during the 1998 recession. He also rallied union leaders and workers to support the restructuring of key companies like
PSA International and
Singapore Airlines (SIA). Aware of the many criticisms of his wearing the two hats - that of NTUC chief and Minister in the Cabinet, Lim argued that this arrangement gave labour a place to influence public policy-making at the highest level. He opined that both trade unions and government have the same objective - to better the lives of workers. Lim was also the Executive Secretary of SMMWU (1981–1991) and advisor to 11 unions affiliated to the NTUC. He was also Chairman of NTUC Pasir Ris Resort Management Committee (1988–1992), Chairman of NTUC Club (1993–2006) and Appointing Governor of the Ong Teng Cheong Institute of Labour Studies (OTC-ILS) (1993–2006). In 2007, the NTUC honoured Lim with the Distinguished Comrade of Labour for his contributions to the trade union movement. The NTUC recognises Lim as having played a key role in building trust among tripartite partners in the tumultuous 1990s when Singapore was rocked by recessions, job losses, and economic restructuring. In 2013, the Lim Boon Heng Scholarship was launched to help Singaporean students who are residents of Jurong Central and Jurong Spring constituencies who have applied for admission into or are pursuing higher education in Singapore universities.
Other appointments Lim was Chairman of the National Productivity Board (1991–2003), later known as the Productivity and Standards Board and subsequently the Standards, Productivity and Innovation Board (SPRING Singapore). Lim was also Chairman of the Skills Development Council (1999–2002). Lim was the Chairman of the Cost Review Committee to look into cost of living in Singapore. (CRC1993 and CRC1996). After Lim's retirement from politics in 2011, he joined
Temasek Holdings as a director in June 2012. In July 2013, the investment company announced his appointment as chairman to replace outgoing chairman
S. Dhanabalan. Lim was also appointed as the chairman of NTUC Enterprise Co-operative in 2012. Lim served as the deputy chairman of the Singapore Labour Foundation. In 2017, Lim urged Singaporeans to work as long as they can, as working longer can offer health benefits and give them a sense of purpose. "We should work for as long as we are able to work, and want to work, although we should not expect the same pay." On 6 June 2025, Temasek Holdings announces that Lim will step down from his chairman role on 9 October with
Teo Chee Hean as his successor. On 30 October, Lim retired from his role as chairman of NTUC Enterprise Co-operative, with Tan Hee Teck as his successor, citing that he takes 'ultimate responsibility' for failed Income-Allianz deal. == Honours ==