Remission of trading liability now includes unilateral write-off in accounts, expanding the scope of cessation treatment. The amendment clarifies that the expression 'loss or expenditure or some benefit in respect of any such trading liability by way of remission or cessation thereof' includes remission or cessation effected by a unilateral act whereby the first-mentioned person, under the successor-in-business framework, writes off such liability in his accounts; such unilateral accounting write-offs are thereby treated as remission or cessation for the provision's purposes.