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Tax - Reconciliation (Details) - GBP (£)
£ in Millions
 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Tax      
UK corporation tax 25.00% 25.00%  
Profit before tax £ 3,585 £ 3,029  
Expected tax charge (896) (757)  
Losses and temporary differences in period where no deferred tax assets recognised (4) (10)  
Foreign profits and losses taxed at other rates 21 17  
losses on disposals and write-downs 5 (9)  
UK bank levy (17) (16)  
regulatory and legal actions (16) (3)  
other disallowable items (14) (17)  
RPI-related uplift on index-linked gilts 9 18  
other non-taxable items 15 4  
Taxable foreign exchange movements (3) 2  
Unrecognised losses bought forward and utilised 18 12  
Net increase in the carrying value of deferred tax assets in respect of UK losses 26    
Banking surcharge (95) (81)  
Pillar 2 top-up tax   (11)  
Tax on paid-in equity dividends 40 33  
Adjustments in respect of prior years 1 17  
Actual tax charge (910) £ (801)  
Deferred tax liability (92)   £ (99)
Deferred tax asset (1,521)   (1,876)
Total losses carried forward      
Tax      
Deferred tax asset £ (953)   £ (1,106)