What CASS Guarantees — The Only Four Things That Matter
The Current Account Switch Service launched in September 2013 and is run by Pay.UK, the not-for-profit operator of UK retail payment systems. More than 50 banks and building societies participate, covering virtually every personal current account brand in Britain.
The guarantee you sign when you trigger a switch commits those banks to four things:
- The switch completes in seven working days — not calendar days. You pick the switch date; everything must be live by end of business on that date. Pay.UK's latest dashboard (issue 49, January 2026) reported a 99.2% seven-day delivery rate for Q4 2025 switches.
- Your old bank closes the old account — you do not have to call them, write to them, or visit a branch.
- All direct debits, standing orders, and your balance transfer automatically — and for 36 months after the switch, any payment sent to your old account number (by an old employer, HMRC, a forgotten subscription) is redirected to your new one.
- You are refunded any charges or interest that result from a mistake by either bank — if a direct debit bounces on switch day because the old bank did not forward it, you claim compensation through the new bank and the service reimburses you in full.
The Q4 2025 dashboard recorded 350,114 switches — the busiest quarter of the year — and public awareness now sits at 77%. Customer satisfaction with the service has climbed to 93%, and 91% of recent switchers say they would recommend it. Cumulative switches since launch crossed 12.4 million by December 2025.
Annual switching fell 11.4% year on year — 1,054,521 in 2025 versus 1,190,676 in 2024, which itself was 18% below 2023's record 1,457,165. The direction is not a sign the service is failing. It is a sign banks offered smaller cash incentives for most of 2025, and switching volumes track bonus size almost perfectly. When banks compete hardest, volumes spike — and Q4 2025's jump to 350,114 followed exactly that pattern, as Barclays, Lloyds, NatWest and Santander all ran simultaneous £150–£200 offers through the quarter.