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Income Tax (Tables) | 12 Months Ended
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Dec. 31, 2019
TextBlock [abstract] |
Summary of Income Tax Expense | Income tax expense consisted of the following:
|  | Years Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Current income tax expense |  |  |  |  |  |  |  |  |  |  |  |
Current tax expense recognized in the current year |  | $ | 73,851.4 |  |  | $ | 60,584.3 |  |  | $ | 47,135.5 |
Income tax adjustments on prior years |  |  | (19,107.0 | ) |  |  | (21,753.0 | ) |  |  | (10,193.8 | )
Other income tax adjustments |  |  | 152.8 |  |  |  | 152.9 |  |  |  | (41.5 | )
|  |  | 54,897.2 |  |  |  | 38,984.2 |  |  |  | 36,900.2 |
Deferred income tax expense (benefit) |  |  |  |  |  |  |  |  |  |  |  |
Effect of tax rate changes |  |  | 561.8 |  |  |  | (1,474.8 | ) |  |  | — |
The origination and reversal of temporary differences |  |  | (4,336.1 | ) |  |  | (3,072.5 | ) |  |  | (1,065.1 | )
|  |  | (3,774.3 | ) |  |  | (4,547.3 | ) |  |  | (1,065.1 | )
Income tax expense recognized in profit or loss |  | $ | 51,122.9 |  |  | $ | 34,436.9 |  |  | $ | 35,835.1 |
Reconciliation of Income before Income Tax and Income Tax Expense Recognized in Profit or Loss | A reconciliation of income before income tax and income tax expense recognized in profit or loss was as follows:
|  | Years Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Income before tax |  | $ | 396,161.9 |  |  | $ | 397,543.1 |  |  | $ | 389,862.1 |
Income tax expense at the statutory rate |  | $ | 69,613.5 |  |  | $ | 80,872.5 |  |  | $ | 79,056.5 |
Tax effect of adjusting items: |  |  |  |  |  |  |  |  |  |  |  |
Nondeductible (deductible) items in determining taxable income |  |  | (1,415.9 | ) |  |  | 2,533.4 |  |  |  | (4,183.5 | )
Tax-exempt income |  |  | (16,901.1 | ) |  |  | (54,543.5 | ) |  |  | (39,808.1 | )
Additional income tax under the Alternative Minimum Tax Act |  |  | — |  |  |  | 21,455.9 |  |  |  | 10,367.9 |
Additional income tax on unappropriated earnings |  |  | 28,183.5 |  |  |  | 16,294.5 |  |  |  | 7,628.1 |
Effect of tax rate changes on deferred income tax |  |  | 561.8 |  |  |  | (1,474.8 | ) |  |  | — |
The origination and reversal of temporary differences |  |  | (4,336.1 | ) |  |  | (3,072.6 | ) |  |  | (1,065.1 | )
Income tax credits |  |  | (5,628.6 | ) |  |  | (6,028.4 | ) |  |  | (5,925.4 | )
|  |  | 70,077.1 |  |  |  | 56,037.0 |  |  |  | 46,070.4 |
Income tax adjustments on prior years |  |  | (19,107.0 | ) |  |  | (21,753.0 | ) |  |  | (10,193.8 | )
Other income tax adjustments |  |  | 152.8 |  |  |  | 152.9 |  |  |  | (41.5 | )
Income tax expense recognized in profit or loss |  | $ | 51,122.9 |  |  | $ | 34,436.9 |  |  | $ | 35,835.1 |
Income Tax Expense Recognized in Other Comprehensive Income |
| b. | Income tax expense recognized in other comprehensive income
|  | Years Ended December 31 |
|  | 2017 |  |  | 2018 |  |  | 2019 |
|  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Deferred income tax benefit (expense) |  |  |  |  |  |  |  |  |  |  |  |
Related to remeasurement of defined benefit obligation |  | $ | 30.6 |  |  | $ | 103.3 |  |  | $ | (30.4 | )
Related to unrealized gain/loss on investments in equity instruments at FVTOCI |  |  | — |  |  |  | 91.8 |  |  |  | 9.4 |
Related to gain/loss on cash flow hedges |  |  | (0.6 | ) |  |  | 0.6 |  |  |  | — |
Related to unrealized gain/loss on available-for-sale financial assets |  |  | (2.9 | ) |  |  | — |  |  |  | — |
|  | $ | 27.1 |  |  | $ | 195.7 |  |  | $ | (21.0 | )
Analysis of Deferred Income Tax Assets and Liabilities in Consolidated Statements of Financial Position | The analysis of deferred income tax assets and liabilities was as follows:
|  | December 31, 2018 |  |  | December 31, 2019 |
|  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |
Deferred income tax assets |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |
Depreciation |  | $ | 11,839.2 |  |  | $ | 13,547.2 |
Refund liability |  |  | 2,594.0 |  |  |  | 2,150.4 |
Net defined benefit liability |  |  | 1,084.9 |  |  |  | 1,016.3 |
Unrealized loss on inventories |  |  | 751.0 |  |  |  | 469.4 |
Deferred compensation cost |  |  | 271.7 |  |  |  | 323.1 |
Investments in equity instruments at FVTOCI |  |  | 56.2 |  |  |  | 65.7 |
Others |  |  | 209.4 |  |  |  | 356.3 |
|  | $ | 16,806.4 |  |  | $ | 17,928.4 |
Deferred income tax liabilities |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |
Unrealized exchange gains |  | $ | (61.7 | ) |  | $ | (333.6 | )
Others |  |  | (171.6 | ) |  |  | (10.8 | )
|  | $ | (233.3 | ) |  | $ | (344.4 | )
|  | Year Ended December 31, 2017 |
|  |  |  |  | Recognized in |  |  |  |  |  |  |  |  |  |
|  | Balance, Beginning of Year |  |  | Profit or Loss |  |  | Other Comprehensive Income |  |  | Effect of Disposal of Subsidiary |  |  | Effect of Exchange Rate Changes |  |  | Balance, End of Year |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Deferred income tax assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  | $ | 4,244.2 |  |  | $ | 4,207.2 |  |  | $ | — |  |  | $ | — |  |  | $ | (50.1 | ) |  | $ | 8,401.3 |
Provision for sales returns and allowance |  |  | 1,512.1 |  |  |  | 130.0 |  |  |  | — |  |  |  | — |  |  |  | (4.4 | ) |  |  | 1,637.7 |
Net defined benefit liability |  |  | 939.5 |  |  |  | 5.2 |  |  |  | 30.6 |  |  |  | — |  |  |  | — |  |  |  | 975.3 |
Unrealized loss on inventories |  |  | 737.3 |  |  |  | (105.1 | ) |  |  | — |  |  |  | — |  |  |  | (2.7 | ) |  |  | 629.5 |
Deferred compensation cost |  |  | 378.7 |  |  |  | (83.1 | ) |  |  | — |  |  |  | — |  |  |  | (29.1 | ) |  |  | 266.5 |
Others |  |  | 445.1 |  |  |  | (222.4 | ) |  |  | — |  |  |  | — |  |  |  | (27.5 | ) |  |  | 195.2 |
Operating loss carryforward |  |  | 14.5 |  |  |  | — |  |  |  | — |  |  |  | (14.5 | ) |  |  | — |  |  |  | — |
|  | $ | 8,271.4 |  |  | $ | 3,931.8 |  |  | $ | 30.6 |  |  | $ | (14.5 | ) |  | $ | (113.8 | ) |  | $ | 12,105.5 |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized exchange gains |  | $ | (48.7 | ) |  | $ | (120.8 | ) |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | (169.5 | )
Available-for-sale financial assets |  |  | (92.5 | ) |  |  | — |  |  |  | (2.9 | ) |  |  | — |  |  |  | — |  |  |  | (95.4 | )
Others |  |  | — |  |  |  | (36.7 | ) |  |  | (0.6 | ) |  |  | — |  |  |  | — |  |  |  | (37.3 | )
|  | $ | (141.2 | ) |  | $ | (157.5 | ) |  | $ | (3.5 | ) |  | $ | — |  |  | $ | — |  |  | $ | (302.2 | )
|  | Year Ended December 31, 2018 |
|  |  |  |  | Recognized in |  |  |  |  |  |  |
|  | Balance, Beginning of Year |  |  | Profit or Loss |  |  | Other Comprehensive Income |  |  | Effect of Exchange Rate Changes |  |  | Balance, End of Year |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Deferred income tax assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  | $ | 8,401.3 |  |  | $ | 3,430.4 |  |  | $ | — |  |  | $ | 7.5 |  |  | $ | 11,839.2 |
Refund liability |  |  | 1,637.7 |  |  |  | 955.0 |  |  |  | — |  |  |  | 1.3 |  |  |  | 2,594.0 |
Net defined benefit liability |  |  | 975.3 |  |  |  | 6.3 |  |  |  | 103.3 |  |  |  | — |  |  |  | 1,084.9 |
Unrealized loss on inventories |  |  | 629.5 |  |  |  | 120.5 |  |  |  | — |  |  |  | 1.0 |  |  |  | 751.0 |
Deferred compensation cost |  |  | 266.5 |  |  |  | (4.7 | ) |  |  | — |  |  |  | 9.9 |  |  |  | 271.7 |
Investments in equity instruments at FVTOCI |  |  | — |  |  |  | — |  |  |  | 56.2 |  |  |  | — |  |  |  | 56.2 |
Others |  |  | 195.2 |  |  |  | 7.1 |  |  |  | — |  |  |  | 7.1 |  |  |  | 209.4 |
|  | $ | 12,105.5 |  |  | $ | 4,514.6 |  |  | $ | 159.5 |  |  | $ | 26.8 |  |  | $ | 16,806.4 |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized exchange gains |  | $ | (169.5 | ) |  | $ | 107.8 |  |  | $ | — |  |  | $ | — |  |  | $ | (61.7 | )
Investments in equity instruments at FVTOCI |  |  | (95.4 | ) |  |  | — |  |  |  | 95.4 |  |  |  | — |  |  |  | — |
Others |  |  | (37.3 | ) |  |  | (75.1 | ) |  |  | (59.2 | ) |  |  | — |  |  |  | (171.6 | )
|  | $ | (302.2 | ) |  | $ | 32.7 |  |  | $ | 36.2 |  |  | $ | — |  |  | $ | (233.3 | )
|  | Year Ended December 31, 2019 |
|  |  |  |  | Recognized in |  |  |  |  |  |  |
|  | Balance, Beginning of Year |  |  | Profit or Loss |  |  | Other Comprehensive Income |  |  | Effect of Exchange Rate Changes |  |  | Balance, End of Year |
|  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |  |  | NT$ |
|  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |  |  | (In Millions) |
Deferred income tax assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Depreciation |  | $ | 11,839.2 |  |  | $ | 1,727.8 |  |  | $ | — |  |  | $ | (19.8 | ) |  | $ | 13,547.2 |
Refund liability |  |  | 2,594.0 |  |  |  | (443.2 | ) |  |  | — |  |  |  | (0.4 | ) |  |  | 2,150.4 |
Net defined benefit liability |  |  | 1,084.9 |  |  |  | (38.2 | ) |  |  | (30.4 | ) |  |  | — |  |  |  | 1,016.3 |
Unrealized loss on inventories |  |  | 751.0 |  |  |  | (280.8 | ) |  |  | — |  |  |  | (0.8 | ) |  |  | 469.4 |
Deferred compensation cost |  |  | 271.7 |  |  |  | 59.4 |  |  |  | — |  |  |  | (8.0 | ) |  |  | 323.1 |
Investments in equity instruments at FVTOCI |  |  | 56.2 |  |  |  | 0.1 |  |  |  | 9.4 |  |  |  | — |  |  |  | 65.7 |
Others |  |  | 209.4 |  |  |  | 151.1 |  |  |  | — |  |  |  | (4.2 | ) |  |  | 356.3 |
|  | $ | 16,806.4 |  |  | $ | 1,176.2 |  |  | $ | (21.0 | ) |  | $ | (33.2 | ) |  | $ | 17,928.4 |
Deferred income tax liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Temporary differences |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrealized exchange gains |  | $ | (61.7 | ) |  | $ | (271.9 | ) |  | $ | — |  |  | $ | — |  |  | $ | (333.6 | )
Others |  |  | (171.6 | ) |  |  | 160.8 |  |  |  | — |  |  |  | — |  |  |  | (10.8 | )
|  | $ | (233.3 | ) |  | $ | (111.1 | ) |  | $ | — |  |  | $ | — |  |  | $ | (344.4 | )
Tax-exemption Information Related to Profits Generated from Certain Projects | As of December 31, 2019, the profits generated from the following projects of TSMC are exempt from income tax for a five-year period:
|  | Tax-exemption Period
Construction and expansion of 2009 by TSMC |  | 2018 to 2022

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