(a) Trustees shall be compensated in accordance with either the trust instrument or any separate written agreement. The agreement shall be between the trustee and the settlor, or after the settlor's death or incapacity or while the trust is irrevocable, and subsequent to any original fee agreement entered into by the settlor and the trustee, the trustee and a majority in number of both of the sui juris income and vested remainder beneficiaries, executed in writing at such time or times as changes, if any, occur.

(b) If the trustee's compensation is not specified in the trust instrument or any separate written agreement, the trustee, for services rendered, shall be entitled to the same compensation as guardians receive for similar services. The trustee's compensation may be paid from time to time as the fees are earned, except that the fees for delivery of property in kind, when specifically approved by the judge of the probate court, may be paid in advance of actual distribution when the judge of the probate court shall determine that this is equitable and that the condition of the estate permits it.

(c) Unless the trust instrument or the agreement provides otherwise:

(1) Compensation among cotrustees shall be apportioned as they shall agree or according to the services rendered by each;

(2) Compensation among successive trustees shall be apportioned according to the proportion of time each rendered services during the year, and shall not include any amount for transferring the trust property or responsibility for it from one trustee to a successor.