Corpus fund should be understood as the capital of the organisation; the funds generated and kept for the existence and sustenance of the organisation.
Corpus funds are generally created out of corpus donation. A donation will be treated as corpus donation only if it is accompanied by a specific written direction of the donor. In the absence of any written direction of the donor, a contribution or grant cannot be transferred to corpus fund. It is important to understand that in case of a corpus fund, the funds are restricted but the purposes are not restricted. Corpus fund is an unrestricted permanent fund. The restriction is on the use itself rather than the type of use. A corpus fund may be used in exceptional circumstances, where the survival of the NGO is at threat. Such decisions are rarely taken and should be taken at general meetings. As such there is no legal bar on application of corpus funds for charitable purposes. But for all practical purposes corpus fund is a permanently closed fund with no strings or restriction for future application attached.