Retirement benefits
Defined contribution plans
Payments to defined contribution schemes are charged to the income statement as they fall due.
Defined benefit plans
Plan assets are measured at fair value and plan liabilities are measured on an actuarial basis, using the projected unit credit method and discounting at an interest rate equivalent to the current rate of return on a high-quality corporate bond of equivalent currency and term to the plan liabilities. The difference between the value of plan assets and liabilities at the period-end date is the amount of surplus or deficit recorded in the statement of financial position as an asset or liability. An asset is recognised when the employer has an unconditional right to use the surplus at some point during the life of the plan or on its wind-up.
The service cost of providing pension benefits to employees, together with the net interest expense or income for the year, is charged to the income statement within ‘administrative expenses’. Net interest is calculated by applying the discount rate to the net defined benefit asset or liability, after any asset restriction. Past service costs and gains, which are the change in the present value of the defined benefit obligation for employee service in prior periods resulting from plan amendments, are recognised immediately the plan amendment occurs. Settlement gains and losses, being the difference between the settlement cost and the present value of the defined benefit obligations being settled, are recognised when the settlement occurs.
Re-measurements comprise actuarial gains and losses, the return on plan assets (excluding amounts included in net interest) and changes in the amount of any asset restrictions. Actuarial gains and losses may result from: differences between the actuarial assumptions underlying the plan liabilities and actual experience during the year or changes in the actuarial assumptions used in the valuation of the plan liabilities. Re-measurement gains and losses, and taxation thereon, are recognised in other comprehensive income and are not reclassified to profit or loss in subsequent periods.
Actuarial valuations are carried out on a regular basis and are updated for material transactions and other material changes in circumstances (including changes in market prices and interest rates) up to the end of the reporting period.