How Much Emergency Fund Should You Keep in the UK?

For UK households working out the actual number for their emergency fund — not the generic "three to six months" but a figure based on their own essential spending, income stability and dependants. It is the calculation counterpart to the emergency fund guide, which covers the why and the build order. Here we size the target precisely and decide where the cash sits.

Step 1 — calculate essential monthly spending

The target is based on needs, not wants. Add up only what you must pay to keep life stable:

• Rent or mortgage, and council tax.
• Utilities, broadband, mobile.
• Basic groceries and household essentials.
• Transport to work or job-hunting.
• Minimum payments on all debts.
• Essential childcare.

Exclude dining out, subscriptions, holidays and luxuries. The Budget Planner helps separate the two.

Step 2 — pick your months based on income risk

Worked example: a couple with one child, 6-month target

• Mortgage & council tax: £1,200
• Utilities & broadband: £250
• Basic groceries: £400
• Transport & insurance: £250
• Minimum debt payments: £100
• Monthly baseline: £2,200 → 6-month target: £13,200

Saving £300/month reaches the target in about 3.5 years. Held in a 4.5% easy-access account, the final-year balance earns around £600 in interest, partly offsetting inflation.

Step 3 — where to hold it

The fund must be liquid and protected from loss, so never invested in the stock market. Easy-access savings accounts, Premium Bonds and Cash ISAs all work. Within those, hunt for a competitive rate so inflation does the least damage — leaving £13,200 in a 0% current account is needlessly costly. See the high-interest savings guide for comparing accounts.

Common mistakes

• Spending it on non-emergencies. A sale or a holiday is not an emergency. If you would not put the cost on a 24% credit card, do not take it from this fund.
• Over-saving in cash. Once the target is reached, redirect further savings to investments and pensions, which historically outpace inflation. Holding £50,000 "just in case" has a real opportunity cost.
• Triggering tax on the interest. A large fund at a good rate can exceed the Personal Savings Allowance (£1,000 basic-rate, £500 higher-rate). Holding the fund in a Cash ISA removes that risk.

If you cannot afford the full target yet

Start with a £1,000 starter fund, then clear high-interest debt, then build towards the full target. One month's rent in reserve is infinitely better than none — even £50 a month, automated, builds momentum. See your timeline with the Savings Goal Calculator.

Limitations

The right number depends on your job security, health, dependants and access to other credit — these are rules of thumb, not guarantees. Cash savings carry inflation risk. For tailored liquidity planning, a certified financial planner can help. General guidance at MoneyHelper: Building your savings.