Senate composition at 1 July 1923 Government (25) - (7 seat majority) Nationalist (24) FSA/Country Party (1)
While senators were elected for a six-year term, people appointed to a casual vacancy only held office until the earlier of the next election for the House of Representatives or the Senate.
NSW however had 2 additional vacancies as a result of the death of 2 senators with terms ending in 1929.
The first three elected, Cox, Duncan and Massy-Greene won the full term from 1 July 1926 to 30 June 1932, while the next two elected Abbott and Thomas won the long vacancies finishing on 30 June 1929.
Massy-Greene who had been appointed to fill one of the vacancies in 1923 ceased to be a senator between 14 November 1925 and the start of his new term on 1 July 1926.