The AGO's fiscal year has been defined differently over time, as follows.
- from inception to 1928: April to March
- 1928: April to December
- 1929-1945: January to December
- 1946/47: January 1946 to June 1947
- 1947-1972: July to June
- 1972/73: July 1972 to March 1973
- 1973 to present: April to March
The AGO's current fiscal year begins on April 1st and ends on March 31st.