Compare the AER, not just the headline interest rate, and check whether it is fixed or variable, includes a bonus, or has withdrawal restrictions. Consider when you may need the money, as easy-access accounts offer flexibility while fixed-term accounts may pay more but limit withdrawals. Check that the provider is covered by the Financial Services Compensation Scheme (FSCS), normally protecting eligible deposits up to £120,000 per authorised firm. You should also consider your Personal Savings Allowance and compare accounts using a current comparison service or FCA-authorised provider.