One household, four different decisions
Assume one UK adult holds £10,000 unchanged in an easy-access saver for 12 months, spends £600 each month on purchases eligible for Chase cashback, makes no ATM withdrawals, deposits no cash, pays no overdraft interest, and has no tax on savings interest in this illustration. They qualify as a new customer for the relevant introductory offers and meet Chase's cashback conditions throughout. We compare free current accounts and savings; no paid insurance, exchange or other benefits are assigned an invented cash value. Rates are variable unless described as a fixed bonus. The savings illustration assumes rates do not change.
At the Chase advertised boosted saver rate of 4.50% AER for 12 months, that is about £450 gross interest. Starling's new-customer Easy Saver advertises 5.00% AER including a six-month fixed bonus, then a 2.50% AER standard variable rate: roughly £374 over a year, modelling two half-years as £10,000 × (1.05 × 1.025)^0.5 − £10,000. Monzo's free-plan instant-access rate of 2.75% AER yields roughly £275. The chart is not a ranking of every UK savings account: it only covers these verified offers, one opening balance and a deliberately constant-rate assumption. Revolut is not assigned a made-up savings return.
At 2% on £600 eligible spend a month, Chase's current-account offer would add £144 annual cashback, below its £20 monthly cap, taking this household's illustrative Chase total to £594 before any tax. Chase requires its current and saver accounts for cashback and applies exceptions and qualification criteria; £600 of general spending is not automatically £600 of qualifying spending. If none qualifies, remove £144. Compare the banks hub for the broader landscape.