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Summary of significant accounting policies (Tables)
 12 Months Ended
Mar. 31, 2021
Schedule of Composite depreciation rate Depreciation is provided over the estimated useful lives of property and equipment on a straight-line basis at the following rates:
Type of Asset
   
Rate of depreciation
Premises
    1.63%
Software and systems
    20.00%
Equipment and furniture
   
10.00%-33.33%
Schedule of Allowances for credit losses on adopting ASC 326
The following table illustrates the impact on allowances for credit losses on adopting ASC 326.
 
    
As of April
 1, 2020
 
    
As reported
under ASC 326
     
Pre-ASC
326
adoption
     
Impact of
ASC 326
adoption
  
    
(In millions)
  
Loans:
                           
Auto loans
    Rs. 29,099.9      Rs. 19,219.0      Rs. 9,880.9  
Personal loans/Credit cards
      85,188.2        47,097.1        38,091.1  
Retail business banking
      36,807.8        32,860.3        3,947.5  
Commercial vehicle and construction equipment finance
      20,788.9        20,463.4        325.5  
Housing loans
      3,360.2        1,700.7        1,659.5  
Other retail loans
      38,098.6        37,864.3        234.3  
Wholesale loans
      66,502.6        39,628.4        26,874.2  
    
 
 
     
 
 
     
 
 
  
Allowance for Credit Losses on Loans
    Rs. 279,846.2      Rs. 198,833.2      Rs. 81,013.0  
Allowance for Credit Losses on AFS debt securities
 
 
—  
 
 
 
—  
 
 
 
—  
 
Accrued expenses and other liabilities:
                           
Allowance for Credit Losses on
Off-Balance
Sheet Credit Exposures and undrawn commitments
    Rs. 5,523.4      Rs. 3,226.8      Rs. 2,296.6  
 
Allowance for Credit Losses Other
      186.8        —        186.8  
    
 
 
     
 
 
     
 
 
  
Tota
l
    Rs. 285,556.4      Rs. 202,060.0      Rs. 83,496.4