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Performance B.6.1 Income tax expense (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Income tax (charge) credit |  |  |  |
Withholding tax | $ (83) | $ (56) | $ (64) |
Other income tax relating to the current year | (65) | (88) | (82) |
Adjustments in respect of prior years | (29) | (7) | 1 |
Current tax expense (income) and adjustments | (177) | (151) | (145) |
Deferred tax (charge) credit |  |  |  |
Origination and reversal of temporary differences | 99 | 58 | 32 |
Effect of change in tax rates | (5) | (8) | (10) |
Tax income (expense) before valuation allowances | 94 | 50 | 22 |
Effect of valuation allowances | (19) | (9) | (8) |
Deferred tax expense (income) | 75 | 41 | 14 |
Adjustments in respect of prior years | 0 | (10) | 19 |
Deferred tax expense (income) and adjustments | 75 | 31 | 33 |
Income Tax Calculation: |  |  |  |
Profit before tax | (271) | 218 | 119 |
Tax at the weighted average statutory rate | 82 | (37) | (1) |
Effect of: |  |  |  |
Items taxed at a different rate | 1 | (1) | 7 |
Change in tax rates on deferred tax balances | (5) | (8) | (10) |
Expenditure not deductible and income not taxable | (106) | (37) | (59) |
Unrelieved withholding tax | (83) | (56) | (64) |
Accounting for associates and joint ventures | 42 | 36 | 5 |
Movement in deferred tax on unremitted earnings | 15 | 9 | (2) |
Unrecognized deferred tax assets | (27) | (20) | (8) |
Recognition of previously unrecognized deferred tax assets | 8 | 11 | 0 |
Adjustments in respect of prior years | (29) | (17) | 20 |
Total tax (charge) credit | $ (102) | $ (120) | $ (112) | [1]
Weighted average statutory tax rate | 30.30% | 17.00% | 0.80% |
Effective tax rate | (37.50%) | 55.00% | 94.10% |
Discontinued operations |  |  |  |
Income Tax Calculation: |  |  |  |
Profit before tax | $ (11) | $ 59 | $ (29) |
Tax at the weighted average statutory rate | 3 | (11) | 0 |
Effect of: |  |  |  |
Items taxed at a different rate | 0 | 0 | 0 |
Change in tax rates on deferred tax balances | 0 | 0 | 0 |
Expenditure not deductible and income not taxable | (3) | 9 | (2) |
Unrelieved withholding tax | 0 | 0 | 0 |
Accounting for associates and joint ventures | 0 | 0 | 0 |
Movement in deferred tax on unremitted earnings | 0 | 0 | 0 |
Unrecognized deferred tax assets | 0 | 0 | (2) |
Recognition of previously unrecognized deferred tax assets | 0 | 0 | 0 |
Adjustments in respect of prior years | (2) | 0 | 0 |
Total tax (charge) credit | (2) | (2) | (4) |
Aggregate continuing and discontinued operations |  |  |  |
Income Tax Calculation: |  |  |  |
Profit before tax | (282) | 277 | 90 |
Tax at the weighted average statutory rate | 85 | (48) | (1) |
Effect of: |  |  |  |
Items taxed at a different rate | 1 | (1) | 7 |
Change in tax rates on deferred tax balances | (5) | (8) | (10) |
Expenditure not deductible and income not taxable | (109) | (28) | (61) |
Unrelieved withholding tax | (83) | (56) | (64) |
Accounting for associates and joint ventures | 42 | 36 | 5 |
Movement in deferred tax on unremitted earnings | 15 | 9 | (2) |
Unrecognized deferred tax assets | (27) | (20) | (10) |
Recognition of previously unrecognized deferred tax assets | 8 | 11 | 0 |
Adjustments in respect of prior years | (31) | (17) | 20 |
Total tax (charge) credit | $ (104) | $ (122) | $ (116) |
Weighted average statutory tax rate | 30.10% | 17.30% | 1.10% |
Effective tax rate | (36.80%) | 44.00% | 128.90% |
Bottom of range |  |  |  |
Effect of: |  |  |  |
Weighted average statutory tax rate | 10.00% | 10.00% | 10.00% |
Top of range |  |  |  |
Effect of: |  |  |  |
Weighted average statutory tax rate | 35.00% | 35.00% | 37.00% |
[1] | 2018 was not restated for the application of IFRS 16, as the Group elected the modified retrospective approach.

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