v3.26.1
Accumulated other comprehensive income (loss), net of tax (Tables)
 12 Months Ended
Mar. 31, 2026
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Changes in Each Component of Accumulated Other Comprehensive Income (Loss), Net of Tax ("AOCI")
Changes in each component of AOCI for the fiscal years ended March 31, 2024, 2025 and 2026 are as follows:
 
    
2024
    
2025
    
2026
  
    
(in millions of yen)
  
AOCI, balance at beginning of fiscal year
      649,395       984,578       931,779  
Net unrealized gains (losses) on
available-for-sale
securities:
       
Balance at beginning of fiscal year
      (31,084 )      2,061       (36,056 )
Unrealized holding gains (losses) during year
      20,972       (48,349 )      (101,373 )
Less: reclassification adjustments for losses (gains) included in net income
      12,173       10,231       54,563  
  
 
 
    
 
 
    
 
 
  
Change during year
      33,145       (38,118 )      (46,810 )
  
 
 
    
 
 
    
 
 
  
Balance at end of fiscal year
      2,061       (36,056 )      (82,866 )
Foreign currency translation adjustments:
       
Balance at beginning of fiscal year
      227,660       467,864       517,081  
Foreign currency translation adjustments during year
      258,887       52,255       312,124  
Less: reclassification adjustments for losses (gains) included in net income
      (18,682 )      (3,038 )      (6,566 )
  
 
 
    
 
 
    
 
 
  
Change during year
      240,204       49,217       305,558  
  
 
 
    
 
 
    
 
 
  
Balance at end of fiscal year
      467,864       517,081       822,639  
Defined benefit plan adjustments:
       
Balance at beginning of fiscal year
      423,677       499,663       422,515  
Unrealized gains (losses) during year
      97,847       (42,062 )      181,244  
Less: reclassification adjustments for losses (gains) included in net income
      (21,861 )      (35,086 )      (27,714 )
  
 
 
    
 
 
    
 
 
  
Change during year
      75,986       (77,148 )        153,530  
  
 
 
    
 
 
    
 
 
  
Balance at end of fiscal year
      499,663       422,515       576,045  
Own credit risk adjustments:
       
Balance at beginning of fiscal year
      29,142       14,990       28,239  
Unrealized gains (losses) during year
      (15,403 )      12,850       (6,076 )
Less: reclassification adjustments for losses (gains) included in net income
      1,251       399       (69 )
  
 
 
    
 
 
    
 
 
  
Change during year
      (14,152 )      13,249       (6,145 )
  
 
 
    
 
 
    
 
 
  
Balance at end of fiscal year
      14,990       28,239       22,095  
Total other comprehensive income (loss), net of tax attributable to MHFG shareholders
      335,184       (52,799 )   
 
406,133
 
  
 
 
    
 
 
    
 
 
  
AOCI, balance at end of fiscal year
   
 
984,578
 
  
 
931,779
 
     1,337,912  
  
 
 
    
 
 
    
 
 
  
Amounts Reclassified Out of Accumulated Other Comprehensive Income into Net Income
The following table shows the amounts reclassified out of AOCI into net income during the fiscal year ended March 31, 2026:
 
   
Before

tax
(1)
    
Tax

effect
(2)
    
Net of tax

before

allocation to

noncontrolling

interests
    
Net of tax

attributable to

noncontrolling

interests
(2)
    
Net of tax

attributable

to MHFG

shareholders
         
   
(in millions of yen)
         
Amounts reclassified out of AOCI into net income:
               

 		 Affected line items in
the consolidated
statements of
income:		  
 
 
 
Net unrealized gains (losses) on
available-for-sale
securities
     (79,123 )     24,560       (54,563 )     —        (54,563 )      Investment gains
(losses)—net		  
 
Foreign currency translation adjustments
     6,566       —        6,566       —        6,566       
 
Foreign exchange
gains (losses)—net
Other noninterest
income
  
 
 
 
Defined benefit plan adjustments
     40,220       (12,509 )
 
     27,711       2       27,714        Salaries and
employee benefits		  
 
Own credit risk adjustments
     100       (32 )     69       —        69        Other noninterest
income (expenses)		  
 
 
 
 
    
 
 
    
 
 
    
 
 
    
 
 
     
Total
          (32,237 )
 
          12,020            (20,217 )
 
        2            (20,215 )
 
   
 
 
 
    
 
 
    
 
 
    
 
 
    
 
 
     
 
Notes:
(1)
The financial statement line item in which the amounts in the before tax column are reported in the consolidated statements of income is listed to the right of the table.
(2)
The financial statement line items in which the amounts in the tax effect and the net of tax attributable to noncontrolling interest columns are reported in the consolidated statements of income are Income tax expense (benefit) and Net income (loss), respectively.