2025-09-03
Cash buffers that make sense for UK households
How much emergency cash to hold, where to keep it, and when surplus cash might sit better in an ISA.
An emergency fund is not a vague comfort idea; it is a fixed number of months of essential spending held in an accessible account. For most UK households, three to six months of rent or mortgage, utilities, food and transport is a workable range.
Keep that money in an easy-access savings account or a cash ISA, not in shares. The point is availability when a boiler fails or income dips, not growth.
Once the buffer is filled, new surplus cash deserves a different home. Stocks and shares ISAs suit longer horizons; workplace pensions suit retirement. Mixing the purposes — dipping into investments for a new kitchen — often leads to selling at awkward times.
Review the buffer once a year after a pay rise or a change in housing costs. If essentials have risen, top the fund up before adding to investment accounts.