Variable-rate savings accounts are for money you may need at short notice: an emergency fund, a purchase date that is not fixed yet, or cash you have not decided what to do with. You can usually get to the money. In return, the bank can change the interest rate.
That is fine for the right job. It is a poor choice if what you really want is a rate that cannot be cut for the next year. In that case, look at fixed-rate products instead.
Why the rate changes
Banks change savings rates when wider interest rates move, and when they need more or fewer deposits. Some accounts also offer a higher “bonus” rate for a few months, then fall back to a lower rate.
When you open an account with a bonus, write the end date in your calendar. Check the rate a few times a year — not every week, and not never.
Notice accounts
A notice account asks you to wait — often 30, 60, or 90 days — before you can withdraw. It may pay more than instant access. It is still a bad home for true emergency money, because emergencies do not wait.
A practical way to use £50,000
Keep a proper emergency reserve in easy-access savings. If another part of the money has a clearer date next year, compare a short fixed rate or a notice account for that part only. Compare easy-access accounts with other easy-access accounts first, then decide whether any money should be locked away.