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Income taxes | 12 Months Ended
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Dec. 31, 2020
Income Tax Disclosure [Abstract] |
Income taxes | Income taxes The provision for income taxes in the consolidated statements of operations represents an effective tax rate different than the Canadian enacted statutory rate o f 26.5% (2019 - 26.5%). The differences are as follows:
| 2020 |  | 2019
Expected income tax expense at Canadian statutory rate | $ | 209,989 |  |  | $ | 147,093 |
Increase (decrease) resulting from: |  |  |
Effect of differences in tax rates on transactions in and within foreign jurisdictions and change in tax rates | (27,082) |  |  | (27,703) |
Adjustments from investments carried at fair value | (87,058) |  |  | (60,730) |
Non-controlling interests share of income | 18,243 |  |  | 16,991 |
Non-deductible acquisition costs | 3,223 |  |  | 2,500 |
Tax credits | (40,185) |  |  | (9,332) |
Adjustment relating to prior periods | (4,228) |  |  | (1,240) |
Amortization and settlement of excess deferred income tax | (12,392) |  |  | (2,554) |
Other | 4,073 |  |  | 5,092 |
Income tax expense | $ | 64,583 |  |  | $ | 70,117 |
On April 8, 2020, the IRS issued final regulations with respect to rules regarding certain Hybrid arrangements as a result of U.S. Tax Reform. As a result of the final regulations, the Company has recorded a one-time income tax expense of $9,300 to reverse the benefit of the deductions taken in the prior year. For the years ended December 31, 2020 and 2019, earnings before income taxes consist of the following:
| 2020 |  | 2019
Canada (1) | $ | 626,980 |  |  | $ | 351,908 |
U.S. | 165,431 |  |  | 203,159 |
| $ | 792,411 |  |  | $ | 555,067 |
(1) Inclusive of fair value gain (loss) on investments carried at fair value (note 8) Income tax expense (recovery) attributable to income (loss) consists of:
| Current |  | Deferred |  | Total
Year ended December 31, 2020 |  |  |  |  |
Canada | $ | 6,336 |  |  | $ | 61,440 |  |  | $ | 67,776 |
United States | (1,448) |  |  | (1,745) |  |  | (3,193) |
| $ | 4,888 |  |  | $ | 59,695 |  |  | $ | 64,583 |
Year ended December 31, 2019 |  |  |  |  |
Canada | $ | 6,695 |  |  | $ | 17,607 |  |  | $ | 24,302 |
United States | 9,736 |  |  | 36,079 |  |  | 45,815 |
| $ | 16,431 |  |  | $ | 53,686 |  |  | $ | 70,117 |
18.Income taxes (continued) The tax effect of temporary differences between the financial statement carrying amounts of assets and liabilities and their respective tax bases that give rise to significant portions of the deferred tax assets and deferred tax liabilities as of December 31, 2020 and 2019 are presented below:
| 2020 |  | 2019
Deferred tax assets: |  |  |
Non-capital loss, investment tax credits, currently non-deductible interest expenses, and financing costs | $ | 531,353 |  |  | $ | 382,448 |
Pension and OPEB | 66,826 |  |  | 54,113 |
Environmental obligation | 16,145 |  |  | 15,541 |
Regulatory liabilities | 168,054 |  |  | 160,200 |
Other | 65,787 |  |  | 59,103 |
Total deferred income tax assets | $ | 848,165 |  |  | $ | 671,405 |
Less: valuation allowance | (29,824) |  |  | (29,447) |
Total deferred tax assets | $ | 818,341 |  |  | $ | 641,958 |
Deferred tax liabilities: |  |  |
Property, plant and equipment | $ | 733,211 |  |  | $ | 707,185 |
Outside basis differentials | 406,429 |  |  | 235,063 |
Regulatory accounts | 212,937 |  |  | 145,852 |
Other | 12,528 |  |  | 14,811 |
Total deferred tax liabilities | $ | 1,365,105 |  |  | $ | 1,102,911 |
Net deferred tax liabilities | $ | (546,764) |  |  | $ | (460,953) |
Consolidated balance sheets classification: |  |  |
Deferred tax assets | $ | 21,880 |  |  | $ | 30,585 |
Deferred tax liabilities | (568,644) |  |  | (491,538) |
Net deferred tax liabilities | $ | (546,764) |  |  | $ | (460,953) |
The valuation allowance for deferred tax assets as at December 31, 2020 was $29,824 (2019 - $29,447). The valuation allowance primarily relates to operating losses that, in the judgment of management, are not more likely than not to be realized. In assessing the realizability of deferred tax assets, management considers whether it is more likely than not that some portion or all of the deferred tax assets will not be realized. The ultimate realization of deferred tax assets is dependent upon the generation of future taxable income during the periods in which those temporary differences become deductible. Management considers the scheduled reversal of deferred tax liabilities (including the impact of available carryback and carryforward periods), projected future taxable income, and tax-planning strategies in making this assessment. As of December 31, 2020, the Company had non-capital losses carried forward and tax credits available to reduce future years' taxable income, which expire as follows:
Non-capital loss carryforward and credits | 2021-2026 | 2027+ | Total
Canada | $ | 58 |  | $ | 552,506 |  | $ | 552,564 |
US | 13,427 |  | 912,589 |  | 926,016 |
Total non-capital loss carryforward | $ | 13,485 |  | $ | 1,465,095 |  | $ | 1,478,580 |
Tax credits | $ | 3,624 |  | $ | 72,849 |  | $ | 76,473 |
The Company has provided for deferred income taxes for the estimated tax cost of distributed earnings of certain of its subsidiaries. Deferred income taxes have not been provided on approximate ly $504,149 of undistributed earnings of certain foreign subsidiaries, as the Company has concluded that such earnings are indefinitely reinvested and should not give rise to additional tax liabilities. A determination of the amount of the unrecognized tax liability relating to the remittance of such undistributed earnings is not practicable.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI http://asc.fasb.org/extlink&oid=116825942&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 + Details
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