Del. Code Ann. tit. 12, § 3561
(b) Unless a trust instrument specifically provides that the trustee shall serve without compensation, when a trust instrument does not fix the compensation of the trustee, reasonable compensation shall be allowed. Subject to the provisions of § 3562 of this title, such compensation shall be determined as follows:
(1) For qualified trustees:
a. Each qualified trustee shall file with the Register in Chancery for every county in this State, a copy of a schedule or formula by which its allowance as compensation shall be computed. Such schedule or formula may be based upon or reflect the following factors: