(1) Where a chargeable person has delivered a return for a chargeable period and has made in the return a full and true disclosure of all material facts necessary for the making of an assessment for the chargeable period -
(a) an assessment for that period, or
(b) an amendment of an assessment for that period,
shall not be made by a Revenue officer on the chargeable person after the end of 4 years commencing at the end of the chargeable period in which the return is delivered and -
(i) no additional tax shall be payable by the chargeable person after the end of that period of 4 years, and
(ii) no tax shall be repaid after the end of a period of 4 years commencing at the end of the chargeable period for which the return is delivered,
by reason of any matter contained in the return.
(2) Nothing in this section prevents a Revenue officer from, at any time, amending an assessment for a chargeable period -
(a) where the return for the period does not contain a full and true disclosure of al
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