v3.26.1
Income Taxes (Components of Net Deferred Tax Assets) (Detail) - JPY (¥)
¥ in Millions
Mar. 31, 2026
Mar. 31, 2025
Mar. 31, 2024
Mar. 31, 2023
Deferred tax assets:        
Derivative financial instruments ¥ 408,829 ¥ 224,074    
Allowance for credit losses 364,516 288,385    
Lease liabilities 166,026 158,220    
Trading securities 92,607 115,783    
Foreign tax credit and payments [1] 87,110 112,412    
Premises and equipment 52,928 45,797    
Available-for-sale securities 38,313 1,454    
Net operating loss carryforwards [2],[3] 134,675 151,390    
Other 325,147 338,067    
Deferred Tax Assets, Gross, Total 1,670,149 1,435,582    
Valuation allowance (185,857) [1],[2],[3] (215,626) [1],[2],[3] ¥ (233,991) ¥ (198,800)
Deferred tax assets, net of valuation allowance 1,484,291 1,219,956    
Deferred tax liabilities:        
Investments 606,109 370,063    
Prepaid pension cost and accrued pension liabilities 212,903 203,490    
Right-of-use assets 152,952 148,989    
Other 184,537 188,913    
Deferred tax liabilities 1,156,502 911,454    
Net deferred tax assets ¥ 327,790 ¥ 308,502    
[1] The amount includes ¥82,572 million and ¥59,644 million related to MHBK’s foreign tax credit carryforwards as of March 31, 2025 and 2026, respectively. The amount is mainly offset by valuation allowance, and if not utilized, the amount will expire during the fiscal year ending March 31, 2027.
[2] The amount includes ¥11,423 million and ¥1,613 million related to MHSC’s net operating loss carryforwards resulting mainly from the organizational restructuring of certain foreign subsidiaries as of March 31, 2025 and 2026, respectively. The tax effect of the net operating loss carryforwards as of March 31, 2025 is substantially offset by ¥4,408 million of valuation allowance as a result of considering all available evidence regarding sources of future taxable income including historical trends in taxable income in the preceding periods and forecasted taxable income.
[3] The amount includes ¥24,943 million and ¥24,852 million related to MHFG’s net operating loss carryforwards resulting mainly from intercompany capital transactions in relation to the share buyback conducted by MHSC as of March 31, 2025 and 2026, respectively. The tax effect of the net operating loss carryforwards is fully offset by ¥24,943 million and ¥24,852 million, respectively, of valuation allowance as a result of considering all available evidence regarding sources of future taxable income including historical trends in taxable income in the preceding periods and forecasted taxable income.