Employee benefit

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AB decides to close a business segment. The segment's employees will be made redundant and will earn no further pension benefits after being made redundant. Their plan assets will remain in the scheme so that the employees will be paid a pension when they reach retirement age (i.e. this is a curtailment without settlement). Before the curtailment, the scheme assets had a fair value of $500,000, and the defined benefit obligation had a present value of $600,000. It is estimated that the curtailment will reduce the present value of the future obligation by 10%, which reflects the fact that employees will not benefit from future salary increases and therefore will be entitled to a smaller pension than previously estimated. Required: What is net gain or loss on curtailment and how will this be treated in the financial statements