(1) Section 579 of the Principal Act is amended -

(a) in subsection (1) by deleting "domiciled and" in each place,

(b) in subsection (2) by substituting the following for paragraph (b):

"(b) Notwithstanding paragraph (a), where a beneficiary under the settlement was neither resident nor ordinarily resident in the State in a year of assessment during which a gain accrued to the trustees, but was so resident or ordinarily resident in an earlier and subsequent year of assessment, the gain which would have accrued to that beneficiary if paragraph (a) had applied shall be treated as accruing in the first year of assessment in which he or she subsequently becomes resident or ordinarily resident in the State.

(c) Notwithstanding paragraph (a), where a person was excluded as a beneficiary under the settlement for a period of time but was subsequently included as a beneficiary of that settlement and a gain accrued to the trustees during a year of assessment when that beneficiary was so excluded, a gain which would have accrued to the beneficiary if paragraph (a) had applied shall be treated as accruing in the first year of assessment in which that person was subsequently included as a beneficiary of the settlement concerned.