Defined benefit plan
The Company’s net obligation in respect of its defined benefit retirement plan is calculated by estimating the amount of future benefit that employees have earned in return for their service in the current financial year and prior periods; the benefit is discounted to determine the present value. Any unrecognised past service costs and the fair value of the plan assets are deducted. The discount rate is the yield at the end of the financial year on high quality corporate bonds or government bonds that have maturity date approximating the terms of the Company’s obligation and are denominated in the same currency in which benefits are expected to be paid.
The calculation is performed by a qualified actuary using the projected unit credit method. When the calculation results in a benefit to the Company, the recognised asset is limited to the net total of any unrecognised past service costs and the present value of any future refunds from the plan or reductions in future contributions to the plan.
When the benefits of the plan are improved, the portion of the increased benefit relating to past service by employees is recognised as an expense in the income statement on a straight-line basis over the average period until the benefits become vested. To the extent that the benefits vest immediately, the expense is recognised immediately in the income statement.
In calculating the Company’s obligation in respect of a plan, to the extent that any cumulative unrecognised actuarial gain or loss exceeds ten percent of the greater of the present value of the defined benefit obligation and the fair value of plan assets, if any, that portion is recognised in the income statement over the expected average remaining working lives of the employees participating in the plan. Otherwise, the actuarial gain or loss is not recognised.
The latest actuarial valuation was performed in Year 2008.