The Treasurer of New South Wales, known from 1856–1959 as the Colonial Treasurer of New South Wales, is the minister in the Government of New South Wales responsible for government expenditure and revenue raising and is the head of the New South Wales Treasury. The Treasurer plays a key role in the economic policy of the government. By convention, the Treasurer is usually a member of the NSW Parliament with a seat in the Legislative Assembly. The exception to this is Michael Egan, Michael Costa and Eric Roozendaal, who were members of the Legislative Council during their tenure as Treasurer.
Each year, the Treasurer presents the NSW Budget to the Parliament. In some other countries the equivalent role is the Minister for Finance, although NSW has had a separate office of that name responsible for regulating government spending. For 103 years the Treasurer was originally known as the 'Colonial Treasurer', however the 'Colonial' word was removed with the passing of the Ministers of the Crown Act 1959 (NSW) from 1 April 1959.
Treasurers Forster, Stuart, Dibbs, Jennings, Reid, Lyne, Waddell, Carruthers, McGowen, Holman, Fuller, Lang, Bavin, Stevens, Mair, McKell, McGirr, Cahill, Heffron, Renshaw, Askin, Lewis, Willis, Wran, Greiner, Fahey and Iemma were also Premier during some or all of their period as Treasurer.
The Assistant Treasurer (along with the Finance Minister) effectively acts as Deputy to the Treasurer. From 1925–1929 there existed the office of 'Assistant Colonial Treasurer'. However this office was abolished and when it returned in 1933, it was titled as 'Assistant Treasurer'. The Assistant Treasurer is not an essential cabinet post, often being appointed on an on-off basis, and there is no Assistant Treasurer at the present. Significantly, the role exists only when in use; there can be a lengthy period between successive holders of the title. The last Assistant Treasurer was John Della Bosca from 1999 to 2006. The title Minister of Finance is also used within New South Wales governments but that role is primarily made responsible for the Revenue collection and administration side of Governance.