How much do you need?
Easy access cash ISA
No cost — compare at moneysavingexpert.comYour emergency fund needs to be accessible within 1–3 days, earning at least base rate, and protected up to £85,000. An easy access ISA fits all three.
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Marcus by Goldman Sachs / Chip / Moneybox
No costHigh-yield easy access accounts that currently pay competitive rates. Rates change — check MSE's Best Buy tables monthly.
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The emergency fund is not an investment. It is not there to grow. It is there to sit, boringly, until something goes wrong — and then to save you.
The calculation
Add up your essential monthly expenses only: rent or mortgage, council tax, utilities (gas, electric, water), food, minimum debt payments, insurance, phone. Do not include discretionary spending — eating out, subscriptions, clothes. That total is your monthly essential baseline.
How many months?
3 months is the minimum. 6 months is the standard recommendation. Some people hold 3 months during debt repayment (to preserve cash for debt clearing) and build to 6 months afterward. If you're self-employed, a contractor, or work in a volatile industry, aim for 6–12 months.
Set interim milestones
If 6 months feels impossibly large, set an interim goal of £1,000. Then £2,500. Then one month. Each milestone is meaningful — even a small buffer prevents the most common financial spirals.
Where to keep it
FSCS protection
The Financial Services Compensation Scheme protects up to £85,000 per person per banking institution. If your bank goes bust, your money is guaranteed up to this limit. Check that your chosen account is FSCS-protected — most UK banks and building societies are.
Not your current account
Your emergency fund must be separate from your everyday account. If it's in the same account, it will be spent. A separate account — even at the same bank — is enough psychological distance for most people. A different bank entirely is better.
What to look for
Easy access (no notice period or maximum 30 days). Pays interest at or above the Bank of England base rate. FSCS-protected. No charges. That's it. You don't need features. You need reliability and interest.
Cash ISA vs standard savings account
If you haven't used your ISA allowance (£20,000 per tax year in 2024/25), a cash ISA protects your interest from income tax. If you're a higher-rate taxpayer or have significant savings, this matters. If you're a basic-rate taxpayer and your savings are modest, the Personal Savings Allowance (£1,000 of interest tax-free) means it's less urgent.
Building it systematically
When to use it
Calculate your monthly essentials
This weekRent, council tax, utilities, food, minimum payments. That number × 3 = your target.
Open a dedicated account
This weekSeparate bank, easy access, FSCS-protected, decent rate. Set it up before your next payday.
Set up the standing order
This weekFixed amount leaves on payday. Even £50/month is a start.
Reach £1,000
Month 1–3Your first meaningful milestone. One month's rent. A car repair. A boiler callout.
Reach 1 month of essentials
Month 3–6This is where the fund starts to feel real.
Reach 3 months
Month 6–12You are now more financially stable than most people in the UK. This is the foundation everything else is built on.
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