2012年ACCA考试《p2公司报告》讲义辅导22

2012年ACCA考试《p2公司报告》讲义辅导22
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Past service costs
　　Watkins Co operates a pension plan that provides a pension of 2% of final salary for every year of service and the benefits become vested after five years’ service. On 1 January 20X6 Watkins Co improved the pension to 2.5% of final salary for every year of service starting from 1 January 20X2.
　　At the date of improvement, the present value of the additional benefits for service from 1 January 20X2 to 1 January 20X6 is as follows.
　
$m

	$m
Employees with more than 5 years’ service at 1/11/X6	300
Employees with less than 5 years’ service at 1/11/X6 （average period until vesting = 3 years）	240
	540

A constructive obligation, which will arise from the entity’s informal practices, exist when the entity has no realistic alternative but to pay employee benefits.