Why You Need an Emergency Fund
An emergency fund is money you set aside for unexpected costs: a car repair, a boiler going in January, redundancy. It is not a savings pot for a holiday or a deposit fund you dip into. The whole point is that it sits there, untouched, until something goes genuinely wrong.
Without one, any unplanned expense lands on a credit card at 20% or more, or forces you to sell investments at the wrong moment. The fund is not about optimising returns. It is about buying yourself options when life gets awkward.
How Much Do You Need?
The general rule is 3-6 months of essential expenses. But this varies:
- 3 months if you have stable employment and low fixed costs
- 6 months if you are self-employed, have dependents, or work in a volatile industry
- 12 months if you are the sole earner or approaching retirement
Essential expenses means the basics: rent or mortgage, council tax, utilities, food, insurance. Not your full spending. Most people overestimate their monthly outgoings because they fold in discretionary spending. Strip it back to what you genuinely must pay every month.
Where to Keep It
Your emergency fund needs to be: 1. Accessible, so you can get to it quickly 2. Safe, so it is not at risk of losing value 3. Separate, so it is not mixed with spending money
Best options: - Easy-access savings account (check current rates) - Cash ISA (tax-free interest) - Premium Bonds (FSCS protected, potential to win more)
Do not put emergency money in a Stocks & Shares ISA. Markets do not care that your boiler has broken. A fund that could be down 20% when you need it is not an emergency fund.
One thing people overlook: the "separate" rule matters more than it sounds. If your emergency money lives in the same account as your spending, it will slowly disappear on normal life. A different account, ideally at a different bank, adds enough friction to protect it.
Building Your Fund
If starting from zero:
- . Start small. Even £500 makes a difference
- . Automate it. Set up a standing order on payday
- . Use windfalls. Tax refunds, bonuses, birthday money
- . Track progress. Use CoreFi to monitor your runway
The mistake most people make is trying to build the full fund before doing anything else with their money. Get to £1,000 first, which covers the majority of genuine emergencies, then build toward three months while continuing to pay down expensive debt. Sitting on six months of expenses in cash while carrying a 22% credit card balance is not a sensible trade-off.
Do Not Touch It
Once built, only use your emergency fund for true emergencies, not holidays or new gadgets. If you do use it, make rebuilding it the immediate priority. An emergency fund that has been raided and not replaced is not a safety net; it is a false sense of security.