From April 2010 there is a corporate level of membership open to individuals in salaried posts in organisations, such as dance agencies, who are working with a portfolio of independent artists in the same way as an IDM.  IDMN Corporate level membership is valid per individual not per organisation.

Membership is open to anyone working in the UK or elsewhere, if
they are working (at least partly) with UK-based artists, companies, buildings or projects. IDMN aims to be an active network and this requires Members to be active participants in the fullest sense. We are not interested in a membership who want to feel they are networked to a resource, but have no commitment to engage or participate in the network. Such members will swiftly become ineligible under the terms of membership.

Members are required to attend as many meetings as possible and,
as a minimum, must attend at least one meeting every year. Should
a member be unable to attend a meeting, apologies should be
offered in advance. Failure to meet the basic attendance requirement, to attend and submit apologies in advance,will result in the automatic termination of membership under the IDMN Constitution.