The membership year runs from 1 October to 30 September of the following year.
If you join as a new member after 1 May, your first year's membership is good until 30 September of the following calendar year.
Existing members pay full renewal fees regardless of what date they send in their membership fees. In other words, if you send in your renewal on 1 September, your membership expires 30 days later.
NOTE that membership renewal notices are NOT sent out by the club. Each member must remember to send in their dues by the end of September.