Download this Montana Irrevocable Living Trust form. An irrevocable trust should not be changed or modified during the life of the grantor because the grantor may incur tax or other consequences. A trust is used by people who want flexibility in directing their assets to their beneficiaries. A grantor can direct that his or her beneficiary not receive distributions from the trust unless he or she has reached a certain age. A grantor can specify that the funds expended be spent only on education or health care or whatever the grantor values. The grantor chooses a trusted person to be the trustee as well as a second person to be a successor trustee. The trustee has a iduciary obligation to the beneficiaries of the trust.