The minimum duration of an EHEDG membership is one year. Furthermore, regardless of the date on which a membership is applied for, an EHEDG membership contribution relates to a calendar year. The membership will be automatically extended from one calendar year to another, if not cancelled in written before 30th September of the current year for the year to come, thus terminating the membership on 31st December. The full payment for the following year will be due in case of cancellation after 30th September. Future invoices will be issued each during the first quarter of a year.