## Accounting Policies  | continued 

The defined benefit pension asset or liability in the Consolidated Balance Sheet comprises the total for each plan of the present value of the defined benefit obligation less the fair value of plan assets out of which the obligations are to be settled directly. Plan assets are assets that are held by a long-term employee benefit fund or qualifying insurance policies. Fair value is based on market price information and, in the case of published securities, it is the published bid price. The value of any defined benefit asset is limited to the present value of any economic benefits available in the form of refunds from the plan and reductions in the future contributions to the plan. 

The Group’s obligation in respect of post-employment healthcare and life assurance benefits represents the amount of future benefit that employees have earned in return for service in the current and prior periods. The obligation is computed on the basis of the projected unit credit method and is discounted to present value using a discount rate equating to the market yield at the balance sheet date on high-quality corporate bonds of a currency and term consistent with the currency and estimated term of the post-employment obligations. 

## Assumptions 

The assumptions underlying the actuarial valuations from which the amounts recognised in the Consolidated Financial Statements are determined (including discount rates, expected return on plan assets, rate of increase in future compensation levels, mortality rates and healthcare cost trend rates) are updated annually based on current economic conditions and for any relevant changes to the terms and conditions of the pension and post-retirement plans. These assumptions can be affected by (i) for the discount rate, changes in the rates of return on high-quality corporate bonds; (ii) for the expected return on plan assets, changes in the pension plans’ strategic asset allocations to various investment types or to long-term return trend rates in the capital markets in which the pension fund assets are invested; (iii) for future compensation levels, future labour market conditions and (iv) for healthcare cost trend rates, the rate of medical cost inflation in the relevant regions. The weighted average actuarial assumptions used and sensitivity analysis in relation to the discount rates employed in the determination of pension and other post-retirement liabilities are contained in Note 28 to the Consolidated Financial Statements. 

While management believes that the assumptions used are appropriate, differences in actual experience or changes in assumptions may affect the obligations and expenses recognised in future accounting periods. The assets and liabilities of defined benefit pension schemes may exhibit significant period- on-period volatility attributable primarily to asset valuations, changes in bond yields and longevity. In addition to future service contributions, significant cash contributions may be required to remediate past service deficits. 

## Taxation – current and deferred – Notes 11 and 27 

Current tax represents the expected tax payable (or recoverable) on the taxable profit for the year using tax rates enacted for the period. Any interest or penalties arising are included within current tax. Where items are accounted for outside of profit or loss, the related income tax is recognised either in other comprehensive income or directly in equity as appropriate. 

Deferred tax is recognised using the liability method on temporary differences arising at the balance sheet date between the tax bases of assets and liabilities and their carrying amounts in the Consolidated Financial Statements. However, deferred tax liabilities are not recognised if they arise from the initial recognition of goodwill; in addition, deferred income tax is not accounted for if it arises from initial recognition of an asset or liability in a transaction other than a business combination that at the time of the transaction affects neither accounting nor taxable profit or loss. No provision has been made for temporary differences applicable to investments in subsidiaries and interests in joint ventures as the Group is in a position to control the timing of reversal of the temporary differences and it is probable that the temporary differences will not reverse in the foreseeable future. Due to the absence of control in the context of associates (significant influence only), deferred tax liabilities are recognised where appropriate in respect of CRH’s investments in these entities on the basis that the exercise of significant influence would not necessarily prevent earnings being remitted by other shareholders in the undertaking. 

Deferred tax is determined using tax rates (and laws) that have been enacted or substantially enacted by the balance sheet date and are expected to apply when the related deferred income tax asset is realised or the deferred income tax liability is settled. Deferred tax assets and liabilities are not subject to discounting. 

Deferred tax assets are recognised in respect of all deductible temporary differences, carry-forward of unused tax credits and unused tax losses to the extent that it is probable that taxable profits will be available against which the temporary differences can be utilised. The carrying amounts of deferred tax assets are subject to review at each balance sheet date and are reduced to the extent that future taxable profits are considered to be inadequate to allow all or part of any deferred tax asset to be utilised. 

The Group’s income tax charge is based on reported profit and expected statutory tax rates, which reflect various allowances and reliefs and tax planning opportunities available to the Group in the multiple tax jurisdictions in which it operates. The determination of the Group’s provision for income tax requires certain judgements and estimates in relation to matters where the ultimate tax outcome may not be certain. The recognition or non-recognition of deferred tax assets as appropriate also requires judgement as it involves an assessment of the future recoverability of those assets. In addition, the Group is subject to tax audits which can involve complex issues that could require extended periods for resolution. Although management believes that the estimates included in the Consolidated Financial Statements and its tax return positions are reasonable, no assurance can be given that the final outcome of these matters will not be different than that which is reflected in the Group’s historical income tax provisions and accruals. Any such differences could have a material impact on the income tax provision and profit for the period in which such a determination is made. 

## Property, plant and equipment – Note 14 

The Group’s accounting policy for property, plant and equipment is considered critical because the carrying value of €8,448 million at 31 December 2012 represents a significant portion (40%) of total assets at that date. Property, plant and equipment are stated at cost less any accumulated depreciation and any accumulated impairments except for certain items that had been revalued to fair value prior to the date of transition to IFRS (1 January 2004). 

Repair and maintenance expenditure is included in an asset’s carrying amount or recognised as a separate asset, as appropriate, only when it is probable that future economic benefits associated with the item will flow to the Group and the cost of the item can be measured reliably. All other repair and maintenance expenditure is charged to the Consolidated Income Statement during the financial period in which it is incurred. 

Borrowing costs incurred in the construction of major assets which take a substantial period of time to complete are capitalised in the financial period in which they are incurred. 

In the application of the Group’s accounting policy, judgement is exercised by management in the determination of residual values and useful lives. Depreciation and depletion is calculated to write off the book value of each item of property, plant and equipment over its useful economic life on a straight-line basis at the following rates: 

Land and buildings:  The book value of mineral-bearing land, less an estimate of its residual value, is depleted over the period of the mineral extraction in the proportion which production for the year bears to the latest estimates of mineral reserves. Land other than mineral-bearing land is not depreciated. In general, buildings are depreciated at 2.5% per annum (“p.a.”). 

Plant and machinery:  These are depreciated at rates ranging from 3.3% p.a. to 20% p.a. depending on the type of asset. Plant and machinery includes transport which is, on average, depreciated at 20% p.a. 

Depreciation methods, useful lives and residual values are reviewed at each financial year-end. Changes in the expected useful life or the expected pattern of consumption of future economic benefits embodied in the asset are accounted for by changing the depreciation period or method as appropriate on a prospective basis. 

## Impairment of long-lived assets and goodwill – Notes 14 and 15 

## Impairment of property, plant and equipment and goodwill 

The carrying values of items of property, plant and equipment are reviewed for indicators of impairment at each reporting date and are subject to impairment testing when events or changes in circumstances indicate that the carrying values may not be recoverable. Goodwill is subject to impairment testing on an annual basis and at any time during the year if an indicator of impairment is considered to exist. In the year in which a business combination is effected and 

