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DEFERRED INCOME TAXES
12 Months Ended
Dec. 31, 2020
Income Tax [Abstract]  
DEFERRED INCOME TAXES Deferred Income Taxes
Recognition and Measurement
We record deferred income tax assets and liabilities where temporary differences exist between the carrying amounts of assets and liabilities in our balance sheet and their tax bases. The measurement and recognition of deferred income tax assets and liabilities takes into account: substantively enacted rates that will apply when temporary differences reverse; interpretations of relevant tax legislation; estimates of the tax bases of assets and liabilities; and the deductibility of expenditures for income tax purposes. In addition, the measurement and recognition of deferred tax assets takes into account tax planning strategies. We recognize the effect of changes in our assessment of these estimates and factors when they occur. Changes in deferred income tax assets and liabilities are allocated between net income, other comprehensive income, equity and goodwill based on the source of the change.
Current income taxes of $16 million have been provided in the year on the undistributed earnings of certain foreign subsidiaries. Deferred income taxes have not been provided on the undistributed earnings of all other foreign subsidiaries for which we are able to control the timing of the remittance, and it is probable that there will be no remittance in the foreseeable future. These undistributed earnings amounted to $16,112 million as at December 31, 2020.
Sources of Deferred Income Tax Assets and Liabilities
As at December 31, 2020 As at December 31, 2019
Deferred tax assets
Tax loss carry forwards $456  $511 
Tax credits 13  28 
Environmental rehabilitation 358  329 
Post-retirement benefit obligations and other employee benefits 30  24 
Other working capital 70  75 
Other 3  11 
$930  $978 
Deferred tax liabilities
Property, plant and equipment (3,375) (3,263)
Inventory (463) (545)
Accrued interest payable (28) (26)
($2,936) ($2,856)
Classification:    
Non-current assets $98  $235 
Non-current liabilities (3,034) (3,091)
($2,936) ($2,856)

The deferred tax asset of $98 million includes $43 million expected to be realized in more than one year. The deferred tax liability of $3,034 million is expected to be realized in more than one year.
Expiry Dates of Tax Losses
2021 2022 2023 2024 2025+ No expiry date Total
Non-capital tax losses1
Barbados $13  $—  $263  $77  $655  $—  $1,008 
Canada —  —  —  —  2,176  —  2,176 
Chile —  —  —  —  —  1,050  1,050 
Tanzania —  —  —  —  —  1,455  1,455 
Zambia —  150  —  —  14  —  164 
Other —  12  —  21  380  417 
$13  $154  $275  $77  $2,866  $2,885  $6,270 
1Represents the gross amount of tax loss carry forwards translated at closing exchange rates at December 31, 2020.

The non-capital tax losses include $4,728 million of losses which are not recognized in deferred tax assets. Of these, $13 million expire in 2021, $4 million expire in 2022, $275 million expire in 2023, $77 million expire in 2024, $2,830 million expire in 2025 or later, and $1,529 million have no expiry date.
    
Recognition of Deferred Tax Assets
We recognize deferred tax assets taking into account the effects of local tax law. Deferred tax assets are fully recognized when we conclude that sufficient positive evidence exists to demonstrate that it is probable that a deferred tax asset will be realized. The main factors considered are:
Historic and expected future levels of taxable income;
Tax plans that affect whether tax assets can be realized; and
The nature, amount and expected timing of reversal of taxable temporary differences.
 
Levels of future income are mainly affected by: market gold, copper and silver prices; forecasted future costs and expenses to produce gold and copper reserves; quantities of proven and probable gold and copper reserves; market interest rates; and foreign currency exchange rates. If these factors or other circumstances change, we record an adjustment to the recognition of deferred tax assets to reflect our latest assessment of the amount of deferred tax assets that is probable will be realized.
Deferred Tax Assets Not Recognized
As at December 31, 2020 As at December 31, 2019
Argentina $105  $103 
Australia 298  277 
Barbados 10  17 
Canada 1,127  1,097 
Chile 1,037  1,074 
Côte d'Ivoire 6 
Mali 9 
Peru 281  329 
Saudi Arabia 70  70 
Tanzania 110  156 
United States  
Zambia   24 
$3,053  $3,161 
Deferred Tax Assets Not Recognized relate to: non-capital loss carry forwards of $1,092 million (2019: $1,082 million), capital loss carry forwards with no expiry date of $323 million (2019: $331 million), and other deductible temporary differences with no expiry date of $1,638 million (2019: $1,748 million).
Source of Changes in Deferred Tax Balances
For the years ended December 31 2020 2019
Temporary differences
Property, plant and equipment ($112) ($1,851)
Environmental rehabilitation 29  37 
Tax loss carry forwards (54) (27)
AMT and other tax credits (14) (10)
Inventory 81  (42)
Other (10) 14 
($80) ($1,879)
Intraperiod allocation to:
Income from continuing operations before income taxes ($151) ($1,073)
Allocation to PPA   (799)
Sale of 50% interest in Kalgoorlie   12 
Income Tax Payable 65  (16)
Other comprehensive income (6) (3)
Other 12  — 
  ($80) ($1,879)
Income Tax Related Contingent Liabilities
2020 2019
At January 1 $327  $306 
Net additions based on uncertain tax positions related to prior years 39  21 
Reductions for tax positions of prior years (100) — 
At December 311
$266  $327 
1If reversed, the total amount of $266 million would be recognized as a benefit to income taxes on the income statement, and therefore would impact the reported effective tax rate.
Tax Years Still Under Examination
Argentina 2010-2011, 2014-2020
Australia 2016-2020
Canada 2015-2020
Chile 2015-2020
Côte d'Ivoire 2019-2020
Democratic Republic of Congo 2019-2020
Dominican Republic 2015-2020
Mali 2017-2020
Papua New Guinea 2006-2020
Peru 2013-2020
Saudi Arabia 2019-2020
Tanzania 2018-2020
United States 2019-2020
Zambia 2018-2020