What CASS Guarantees — and What It Doesn't
The Current Account Switch Service launched in September 2013, run by Pay.UK, the not-for-profit operator of UK retail payment systems. More than 50 banks and building societies participate. Over 12 million switches have been completed since launch.
The guarantee commits both banks to four things:
- The switch completes in seven working days — you pick the date, and everything must be live by end of business on that date. Pay.UK's latest dashboard (issue 50, published 30 April 2026, covering Q1 2026) maintained the 99.2% seven-day delivery record.
- Your old bank closes the old account — you do not 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 is redirected to your new one.
- You are refunded any charges or interest that result from a mistake by either bank — the Financial Ombudsman Service is the backstop.
The Q4 2025 dashboard recorded 350,114 switches — the busiest quarter of the year, driven by simultaneous £150–£200 offers from Barclays, Lloyds, NatWest, and Santander. Annual switching in 2025 totalled 1,054,521, down 11.4% from 2024's 1,190,676. The contraction through Q1 2026 reflected weaker incentives — not a failure of the service. When HSBC returned with £220 in late June, the market signalled that the bonus contraction of early 2026 was a pause, not a permanent retreat.
What CASS does not do: it does not move recurring card payments (Netflix, Amazon Prime, Tesco delivery saver). Those rely on stored card details you must update manually. It does not move payee lists. Budget an hour in the fortnight after switch day. Download your old statements before the switch — once the account closes, retrieving them requires a formal request.
If a switching offer unlocks a monthly saver, compare the actual interest on staged deposits in our regular-saver maths guide.