No final account of a fiduciary shall be allowed by the probate court unless such account shows, and the judge of said court finds, that all taxes imposed by the provisions of this Subchapter upon said fiduciary, which have become payable, have been paid, and that all taxes which may become due are secured by bond, deposit, or otherwise. The certificate of the Secretary of Revenue and the receipt for the amount of tax herein certified shall be conclusive as to the payment of the tax to the extent of said certificate.

For the purpose of facilitating the settlement and distribution of estates held by fiduciaries, the Secretary of Revenue, with the approval of the Attorney General, may, on behalf of the State, agree upon the amount of taxes at any time due or to become due from such fiduciaries under the provisions of this Subchapter, and the payment in accordance with such agreement shall be full satisfaction of the taxes to which the agreement relates. (1939, c. 158, s. 911; 1973, c.? 476, s. 193.)