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Equity (Tables)
 12 Months Ended
Dec. 31, 2020
Statement [LineItems]  
Appropriations of Earnings and Dividends Per Share
The appropriation of 2018 earnings has been approved by TSMC’s shareholders in its meeting held on June 5, 2019. The appropriation and cash dividends per share were as follows:
 
   
Appropriation of Earnings
   
Cash Dividends Per Share
 
   
NT$
   
(NT$)
 
   
(In Millions)
     
Legal capital reserve
  $35,113.1   
  
 
 
   
Special capital reserve
  $(11,459.5)   
  
 
 
   
Cash dividends to shareholders
  $207,443.0   $8.0 
  
 
 
   
The appropriations of 2019 and 2020 quarterly earnings have been approved by TSMC’s Board of Directors in its meeting, respectively. The appropriations and cash dividends per share were as follows:
 
   
First Quarter
of 2019
   
Second Quarter
of 2019
   
Third Quarter
of 2019
   
Fourth Quarter
of 2019
 
   
NT$
(In Millions)
   
NT$
(In Millions)
   
NT$
(In Millions)
   
NT$
(In Millions)
 
Resolution date of TSMC’s Board of Directors in its meeting
  
 
 
June 5,
2019
 
 
  
 
 
August 13,
2019
 
 
  
 
November 12,
2019
 
 
  
 
February 11,
2020
 
 
Special capital reserve
  $(4,724.0)   $(3,338.2)   $3,289.2   $16,893.0 
  
 
 
   
 
 
   
 
 
   
 
 
 
Cash dividends to shareholders
  $51,860.8   $64,826.0   $64,826.0   $64,826.0 
  
 
 
   
 
 
   
 
 
   
 
 
 
Cash dividends per share (NT$)
  $2.0   $2.5   $2.5   $2.5 
  
 
 
   
 
 
   
 
 
   
 
 
 
 
   
First Quarter
of 2020
   
Second Quarter
of 2020
   
Third Quarter
of 2020
   
Fourth Quarter
of 2020
 
   
NT$
(In Millions)
   
NT$
(In Millions)
   
NT$
(In Millions)
   
NT$
(In Millions)
 
Resolution date of TSMC’s Board of Directors in its meeting
  
 
 
May 12,
2020
 
 
  
 
 
August 11,
2020
 
 
  
 
November 10,
2020
 
 
  
 
February
9, 2021
 
 
Special capital reserve
  $(2,694.8)   $11,884.5   $5,501.3   $12,420.7 
  
 
 
   
 
 
   
 
 
   
 
 
 
Cash dividends to shareholders
  $64,826.0   $64,826.0   $64,826.0   $64,826.0 
  
 
 
   
 
 
   
 
 
   
 
 
 
Cash dividends per share (NT$)
  $2.5   $2.5   $2.5   $2.5 
  
 
 
   
 
 
   
 
 
   
 
 
 
Changes in Other Reserves
Changes in others were as follows:
 
 
  
Year Ended December 31, 2018
 
 
  
Foreign
Currency
Translation
Reserve
 
  
Unrealized
Gain (Loss) on
Financial
Assets at
FVTOCI
 
  
Gain (Loss) on
Hedging
Instruments
 
  
Unearned
Stock-Based
Employee
Compensation
 
  
Total
 
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
Balance, beginning of year(IFRS 9)
  
$
(26,697.7
) 
  
$
(524.9
) 
  
$
4.2
 
  
$
(10.3
) 
  
$
(27,228.7
) 
Exchange differences arising on translation of foreign operations
  
 
14,562.0
 
  
 
—
 
  
 
—
 
  
 
—
 
  
 
14,562.0
 

 
  
Year Ended December 31, 2018
 
 
  
Foreign
Currency
Translation
Reserve
 
  
Unrealized
Gain (Loss) on
Financial
Assets at
FVTOCI
 
  
Gain (Loss) on
Hedging
Instruments
 
  
Unearned
Stock-Based
Employee
Compensation
 
  
Total
 
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
  
NT$
(In Millions)
 
Unrealized gain (loss) on financial assets at FVTOCI
  
   
  
   
  
   
  
   
  
   
Equity instruments
  
$
—
 
  
$
(3,311.6
) 
  
$
—
 
  
$
—
 
  
$
(3,311.6
) 
Debt instruments
  
 
—
 
  
 
(1,858.0
) 
  
 
—
 
  
 
—
 
  
 
(1,858.0
) 
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal
  
 
—
 
  
 
1,193.1
 
  
 
—
 
  
 
—
 
  
 
1,193.1
 
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal
  
 
—
 
  
 
989.1
 
  
 
—
 
  
 
—
 
  
 
989.1
 
Loss allowance adjustments from debt instruments
  
 
—
 
  
 
(2.0
) 
  
 
—
 
  
 
—
 
  
 
(2.0
) 
Gain (loss) arising on changes in the fair value of hedging instruments
  
 
—
 
  
 
—
 
  
 
41.0
 
  
 
—
 
  
 
41.0
 
Transferred to initial carrying amount of hedged items
  
 
—
 
  
 
—
 
  
 
(22.2
) 
  
 
—
 
  
 
(22.2
) 
Share of other comprehensive income (loss) of associates
  
 
93.3
 
  
 
(6.8
) 
  
 
—
 
  
 
—
 
  
 
86.5
 
Share of unearned stock-based employee compensation of associates
  
 
—
 
  
 
—
 
  
 
—
 
  
 
8.5
 
  
 
8.5
 
Income tax effect
  
 
—
 
  
 
91.8
 
  
 
0.6
 
  
 
—
 
  
 
92.4
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
      
Balance, end of year
  
$
(12,042.4
) 
  
$
(3,429.3
) 
  
$
23.6
 
  
$
(1.8
) 
  
$
(15,449.9
) 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
 
  
 
 
   
Year Ended December 31, 2019
 
   
Foreign
Currency
Translation
Reserve
   
Unrealized
Gain (Loss) on
Financial
Assets at
FVTOCI
   
Gain (Loss) on
Hedging
Instruments
   
Unearned
Stock-Based
Employee
Compensation
   
Total
 
   
NT$
   
NT$
   
NT$
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
   
(In Millions)
   
(In Millions)
   
(In Millions)
 
Balance, beginning of year
  $(12,042.4)   $(3,429.3)   $23.6   $(1.8)   $(15,449.9) 
Exchange differences arising on translation of foreign operations
   (14,693.5)    —    —    —    (14,693.5) 
Unrealized gain (loss) on financial assets at FVTOCI
                         
Equity instruments
   —    334.5    —    —    334.5 
Debt instruments
   —    3,097.3    —    —    3,097.3 
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal
   —    (162.1)    —    —    (162.1) 
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal
   —    (537.8)    —    —    (537.8) 
Loss allowance adjustments from debt instruments
   —    6.9    —    —    6.9 
Gain (loss) arising on changes in the fair value of hedging instruments
   —    —    (109.6)    —    (109.6) 
Other comprehensive income transferred to profit or loss due to disposal of subsidiary
   4.6    —    —    —    4.6 
Transferred to initial carrying amount of hedged items
   —    —    82.3    —    82.3 
Share of other comprehensive income (loss) of associates
   (140.1)    (11.8)    (0.1)    —    (152.0) 
Share of unearned stock-based employee compensation of associates
   —    —    —    1.6    1.6 
Income tax effect
   —    9.4    —    —    9.4 
      
Balance, end of year
  $(26,871.4)   $(692.9)   $(3.8)   $(0.2)   $(27,568.3) 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
 
   
Year Ended December 31, 2020
 
   
Foreign
Currency
Translation
Reserve
   
Unrealized
Gain (Loss) on
Financial
Assets at
FVTOCI
   
Gain (Loss) on
Hedging
Instruments
   
Unearned
Stock-Based
Employee
Compensation
   
Total
 
   
NT$
(In Millions)
   
NT$
(In Millions)
   
NT$
(In Millions)
   
NT$
(In Millions)
   
NT$
(In Millions)
 
      
Balance, beginning of year
  $(26,871.4)   $(692.9)   $(3.8)   $(0.2)   $(27,568.3) 
Exchange differences arising on translation of foreign operations
   (29,846.8)    —    —    —    (29,846.8) 
Unrealized gain (loss) on financial assets at FVTOCI
                         
Equity instruments
   —    423.2    —    —    423.2 
Debt instruments
   —    3,907.0    —    —    3,907.0 
Cumulative unrealized gain (loss) of equity instruments transferred to retained earnings due to disposal
   —    108.7    —    —    108.7 
Cumulative unrealized gain (loss) of debt instruments transferred to profit or loss due to disposal
   —    (1,439.4)    —    —    (1,439.4) 
Loss allowance adjustments from debt instruments
   —    (0.9)    —    —    (0.9) 
Gain (loss) arising on changes in the fair value of hedging instruments
   —    —    24.1    —    24.1 
Transferred to initial carrying amount of hedged items
   —    —    (20.3)    —    (20.3) 
Share of other comprehensive income (loss) of associates
   (283.4)    15.5    —    —    (267.9) 
Share of unearned stock-based employee compensation of associates
   —    —    —    0.2    0.2 
Income tax effect
   —    0.6    —    —    0.6 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
      
Balance, end of year
  $(57,001.6)   $2,321.8   $—   $—   $(54,679.8) 
   
 
 
   
 
 
   
 
 
   
 
 
   
 
 
 
Capital Stock - Common Stock [member]  
Statement [LineItems]  
Summary of Capital Stock and Capital Surplus
 a.
Capital stock
 
   
December 31,
2019
   
December 31,
2020
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Authorized shares
   28,050.0    28,050.0 
  
 
 
   
 
 
 
Authorized capital
  $280,500.0   $280,500.0 
  
 
 
   
 
 
 
Issued and paid shares
   25,930.3    25,930.3 
  
 
 
   
 
 
 
Issued capital
  $259,303.8   $259,303.8 
  
 
 
   
 
 
 
Capital Surplus [member]  
Statement [LineItems]  
Summary of Capital Stock and Capital Surplus
 b.
Capital surplus
 
   
December 31,
2019
   
December 31,
2020
 
   
NT$
   
NT$
 
   
(In Millions)
   
(In Millions)
 
Additional
paid-in
capital
  $24,185.0   $24,185.0 
From merger
   22,804.5    22,804.5 
From convertible bonds
   8,892.9    8,892.9 
From share of changes in equities of subsidiaries
   121.8    121.8 
From share of changes in equities of associates
   302.2    302.5 
Donations
   33.3    40.5 
  
 
 
   
 
 
 
  $56,339.7   $56,347.2