There are three categories of membership, "Individual", "Corporate" and "Young". Members in all categories have one vote in the Society's formal proceedings, but Corporate Members may be represented at functions by one or more persons. The annual membership fee is EUR 20 for Young Members, EUR 75 for Individual Members and EUR 200 for Corporate Members.

Young Members are living in Belgium and aged below 35. Once a Young Member turns 36, his/her membership will be transferred to either Individual or Corporate Member.