1121.8. Where a trust is a member of a partnership a fiscal period of a business or property of which ends in a calendar year after 15 December of the year and a particular taxation year of the trust ends on 15 December of the year because of section 1121.7, each amount otherwise determined under paragraph f or g of section 600 to be the trust’s income or loss for a taxation year subsequent to that year is deemed to be the trust’s income or loss determined under that paragraph for the particular year and not for the subsequent year.