Building an emergency fund

An emergency fund is the foundation of every other money goal. It’s a lump of easily accessible cash that exists for one reason: to catch you when life happens, so a broken boiler or a lost job doesn’t turn into high-interest debt. Here’s how to build yours.

How much do you need?

The rule of thumb is 3–6 months of essential costs:

• 3 months — stable salary, low risk of income shock
• 6 months — self-employed, commission-based, or a single-income household

Work out your essentials: rent or mortgage, bills, food, transport, insurance and minimum debt payments. That monthly figure × 3 (or 6) is your target.

The sizes in between

Don’t be daunted by the full target — it’s a journey with milestones:

• £0 → £500 — the “sink fund”: catches most small emergencies and stops you reaching for a credit card
• £500 → 1 month of costs — covers a broken appliance, a fine, a hospital trip
• 1 → 3 months — you can now survive a real shock like redundancy
• 3 → 6 months — full resilience, especially for the self-employed

Example. Essentials are £1,400 a month. Target: £4,200 (3 months) to £8,400 (6 months). At £300 a month, £4,200 takes about 14 months. At £200 a month, around 21 months. Slow and steady works.

How to build it

1. Set a monthly amount — even £50–100 a month, from your budget’s savings slice
2. Automate it — a standing order to a separate savings account on payday
3. Bank windfalls — bonuses, tax refunds and birthday money straight into the fund
4. Raise it with pay rises — your fund grows without you feeling it

Where it lives

Keep the fund in an easy-access savings account or cash ISA — safe, instant, and ideally separate from your daily spending account so it’s not accidentally spent. It should earn some interest, but access matters more than rate. Never invest it: investments can fall exactly when you need the money.

When to use it (and when not to)

Use it for genuine emergencies — unexpected essential costs or loss of income. Don’t use it for planned spending like holidays or new tech; those belong to a separate savings goal. If you do dip in, make refilling it your top priority, before other savings.

See the maths

Use the budget calculator to find your essentials and the savings slice, then the savings calculator to see how quickly your monthly amount reaches your target.