The number of current account switches has topped a million for the third year in a row after a surge in people hunting down new deals towards the end of 2025. The final three months of 2025 was the busiest quarter, with 350,114 current account switches, according to data from the Current Account Switch Service (Cass). Nationwide Building Society gained the most customers through Cass (Mike Egerton/PA) · Mike EgertonThe service allows people to switch their current account automatically by having payments moved over to a new provider. Nationwide gained the highest number of customers switching to its current accounts between July and September, with Cass’s data reported three months in arrears. On the other end of the scale, customers were switching away from banks including Santander, which lost almost 20,000 current accounts during the period.