80 Consolidated  Notes to the  Financial  Statements 2011 2010 $m $m Note 9 – Income tax Income tax recognised in the income statement The major components of income tax expense are: Current income tax Current tax expense in respect of the current year  141.5 102.3 Adjustments in relation to current tax of prior years  (6.0) (2.6) Effect of retrospective changes to Tax Consolidation Legislation  (5.5) (85.5) Deferred income tax Relating to the origination and reversal of temporary differences  104.9 7.3 Total income tax expense 234.9 21.5 Numerical reconciliation between tax expense and pre-tax accounting profi t The prima facie income tax expense on pre-tax accounting profit reconciles  to the income tax expense in the financial statements as follows: Profit before tax  793.6 377.6 Income tax expense calculated at the Australian tax rate of 30% (2010: 30%)  238.1 113.3 Non-deductible expenses  7.5 9.6 Gain on disposal of businesses and subsidiaries  1.9 3.7 Share of profits of associates and jointly controlled entities  (1.1) (12.2) Previously unrecognised tax losses used to reduce deferred tax expense  – (3.3) Effect of retrospective changes to Tax Consolidation Legislation  (5.5) (85.5) Other  – (1.5) Adjustments in relation to current tax of prior years  (6.0) (2.6) 234.9 21.5 Income tax recognised in other comprehensive income Deferred income tax Revaluation of financial instruments treated as cash flow hedges  21.1 (66.4) Actuarial gain/(loss) on defined benefit plans  1.1 (2.4) Income tax expense/(income) recognised in equity  22.2 (68.8) Current tax assets and liabilities Current tax assets Income tax refund receivable  – – Current tax liabilities Income tax payable  167.2 42.5 Deferred income tax recognised in the income statement Temporary differences Unbilled revenue  9.8 34.6 Allowance for doubtful debts  (0.3) 1.1 Other receivables  0.9 6.1 Exploration and evaluation assets  6.4 15.9 Oil and gas assets  7.4 5.1 Property, plant and equipment  19.4 8.7 Defined benefit superannuation plans  2.8 2.3 Payables and accruals  (0.5) (10.6) Provisions  (1.1) 0.2 Derivative financial instruments  64.1 (56.1) Unearned revenue  (6.0) 0.4 Share issue transaction costs  1.3 1.3 Other  0.7 (1.7) 104.9 7.3