Year	Issue of Writ	Close of Nominations	Polling Day
1901 NSW	5 March 1901	15 March 1901	29 March 1901
Vic	4 March 1901	15 March 1901	29 March 1901
Qld	18 February 1901	2 March 1901	30 March 1901
SA	20 February 1901	4 March 1901	30 March 1901
WA	18 February 1901	8 March 1901	29 March 1901
Tas	13 March 1901	22 March 1901	29 March 1901
1903	23 November 1903	3 December 1903	16 December 1903
1906	8 November 1906	17 November 1906	12 December 1906
1910	28 February 1910	16 March 1910	13 April 1910
1913	24 April 1913	2 May 1913	31 May 1913
1914*	30 July 1914	7 August 1914	5 September 1914
1917	26 March 1917	5 April 1917	5 May 1917
1919	3 November 1919	14 November 1919	13 December 1919
1922	6 November 1922	17 November 1922	16 December 1922
1925	3 October 1925	15 October 1925	14 November 1925
1928	9 October 1928	19 October 1928	17 November 1928
1931 NSW Vic Qld	28 November 1931	5 December 1931	19 December 1931
WA Tas	3 December 1931	10 December 1931	19 December 1931
SA	5 December 1931	12 December 1931	19 December 1931
1934	16 August 1934	23 August 1934	15 September 1934
1937	24 September 1937	2 October 1937	23 October 1937
1940	30 August 1940	7 September 1940	21 September 1940
1943	16 July 1943	30 July 1943	21 August 1943
1946	21 August 1946	3 September 1946	28 September 1946
1949	31 October 1949	14 November 1949	10 December 1949
1951*	28 March 1951	6 April 1951	28 April 1951
1953	2 April 1953	17 April 1953	9 May 1953
1955	7 November 1955	16 November 1955	10 December 1955
1958	22 October 1958	31 October 1958	22 November 1958
1961	3 November 1961	14 November 1961	9 December 1961
1964	26 October 1964	9 November 1964	5 December 1964
1967	13 October 1967	27 October 1967	25 November 1967
1970	16 October 1970	29 October 1970	21 November 1970
1974*	20 April 1974	29 April 1974	18 May 1974
1975* NSW Vic Qld Tas NT ACT	17 November 1975	28 November 1975	13 December 1975
SA WA	21 November 1975	28 November 1975	13 December 1975
1977	10 November 1977	18 November 1977	10 December 1977
1980	19 September 1980	27 September 1980	18 October 1980
1983*	4 February 1983	19 February 1983	5 March 1983

Year	Issue of Writ	Close of Rolls**	Close of Nominations	Polling Day
1984	26 October 1984	2 November 1984	6 November 1984	1 December 1984
1987*	5 June 1987	12 June 1987	18 June 1987	11 July 1987
1990	19 February 1990	26 February 1990	2 March 1990	24 March 1990
1993	8 February 1993	15 February 1993	19 February 1993	13 March 1993
1996	29 January 1996	5 February 1996	9 February 1996	2 March 1996
1998	31 August 1998	7 September 1998	10 September 1998	3 October 1998
2001	8 October 2001	15 October 2001	18 October 2001	10 November 2001
2004	31 August 2004	7 September 2004	16 September 2004	9 October 2004
2007***	17 October 2007	23 October 2007	1 November 2007	24 November 2007

* These elections were double dissolutions.

** The 1993 major reforms to the Commonwealth Electoral Act provided for rolls to close 7 days after the issue of the writ rather than on the day the writ was issued.

*** The 2007 major reforms to the CEA provided for rolls to close 3 days after the issue of the writ rather than 7 days (for electors wishing to update their existing enrolment details), however no new names were added to the roll after 8pm on the day of issue of writ.

Elections held to fill casual vacancies in the senate

Year	Issue of Writ	Close of Nominations	Polling Day
1908 SA	13 January 1908	21 January 1908	15 February 1908
1963 Qld	1 November 1963	8 November 1963	30 November 1963
1966 NSW Vic Qld WA	31 October 1966	7 November 1966	26 November 1966
1969 Vic SA	29 September 1969	7 October 1969	25 October 1969
1972 Qld	2 November 1972	10 November 1972	2 December 1972

Following the 1977 referendum on Senate casual vacancies, section 15 of the Constitution was altered and there will not be another election to fill a Senate casual vacancy. Vacancies are now filled by a joint sitting of the State Parliament nominating a new Senator who must be of the same political affiliation as the previous Senator was at the time of his or her election or appointment.

Sources:

* Commonwealth Election and Referendum Statistics 1901-1975. Pg 9. Australian Electoral Office. AGPS, Canberra 1976

* The Constitution