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) (PA Archive)The service allows people to switch their current account automatically by having payments moved over to a new provider. There were 1,054,521 in total over 2025 – the third year in a row that switches have topped one million. 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.