How much should I have in an emergency fund?
The standard answer is three to six months of essential spending — but the right figure for you depends on how stable your income is and who relies on it. Here’s how to size yours properly.
The short answer
Most people should aim for three to six months of essential outgoings in accessible cash. If your essentials are £1,800 a month, that’s £5,400 to £10,800. Lean toward three months if your job is secure and stable, and six months or more if you’re self-employed, have an irregular income, or are the sole earner for a household.
An emergency fund is the cash that stops a bad week becoming a financial crisis. A boiler dies, a car fails its MOT, the work dries up — and instead of reaching for a credit card, you reach for savings. That’s its whole job.
The classic rule is three to six months of essential spending. Note the word essential: not your whole salary, just the costs you couldn’t avoid — rent or mortgage, bills, food, transport, minimum debt payments. Holidays and takeaways don’t count, because in a real emergency you’d cut them anyway.
So the first job isn’t choosing three months or six. It’s working out your essential monthly outgoings — the floor you’d need to keep the lights on if your income stopped tomorrow.
Three months or six? It depends on your risk
The range exists because not everyone faces the same risk. The more secure and predictable your income, the smaller the buffer you need; the more volatile, the bigger.
Lean toward three months if you’ve got a stable salaried job, an employer who’d give notice, and a second income in the household. Lean toward six — or more — if you’re self-employed, on a zero-hours or commission-based income, the sole earner, or in a sector where finding new work takes time.
One thing first, though: if you’re carrying high-interest debt, don’t build a full six-month fund before tackling it. A smaller starter buffer of around £1,000 covers most surprises while you clear the expensive debt — then build the fuller fund once it’s gone.
What changes the size you need?
The 3–6 month range shifts with your circumstances. Four things move it most.
!Job security
A stable salaried role needs less buffer than self-employment or zero-hours work, where income can stop or swing without warning.
2×One income or two
A sole earner carries all the risk alone and needs a bigger cushion. A two-income household has a fallback if one job goes.
£Your fixed costs
High, hard-to-cut outgoings — a big mortgage, dependants — mean you need more months covered. Lean fixed costs need less.
%Other safety nets
Sick pay, a partner’s income, or family who could help all reduce how much you must hold yourself in cash.
Emergency fund by monthly essentials
How much to hold at three and six months, for different levels of essential monthly spending.
| Essential spending/month | 3-month fund | 6-month fund |
|---|---|---|
| £1,200 | £3,600 | £7,200 |
| £1,500 | £4,500 | £9,000 |
| £1,800 | £5,400 | £10,800 |
| £2,200 | £6,600 | £13,200 |
| £2,800 | £8,400 | £16,800 |
These are based on essential outgoings only, so they’re lower than three to six months of full salary. Keep the money somewhere accessible but separate — an easy-access savings account, not your current account — so it’s there when needed but not spent by accident. Size yours with the emergency fund calculator.
An emergency fund, worked through
One realistic example, to show how to size a buffer to real circumstances.
- Essentials. Tom adds up rent, bills, food and transport — about £2,000 a month, ignoring discretionary spending.
- His risk. He’s self-employed and the only earner, so income can stop suddenly with no sick pay — he sits at the high-risk end.
- The target. Six months feels right given the risk: £12,000, not the three-month £6,000 a secure salaried worker might hold.
- The buffer first. He had a small credit card balance, so he built a £1,000 starter fund and cleared the card before topping up to £12,000.
- Where it lives. He keeps it in a separate easy-access account, earning interest but instantly reachable.
The takeaway: Tom’s number wasn’t “three to six months” in the abstract — it was six months of his real essentials, because his income is risky and his alone. The rule gives a range; his circumstances picked the end of it.
Size your own emergency fund
Enter your essential outgoings and risk level to see your target buffer and how long it’ll take to build.
Emergency fund questions, answered
How much should I have in an emergency fund?
Is three months enough for an emergency fund?
Should I build an emergency fund or pay off debt first?
Where should I keep my emergency fund?
Does an emergency fund need to cover my whole salary?
How long should it take to build an emergency fund?
Should retired people have an emergency fund?
Related guides & tools
How this guide is built
The three-to-six-month guideline reflects standard UK personal-finance practice; the figures use essential outgoings rather than full income. The right size depends on income stability and circumstances — the calculator lets you set a target for your own situation.
Definitions and sources: methodology · sources.
Not financial advice. This guide is for general information and links to a calculator that produces estimates. The right buffer depends on your circumstances — if you’re struggling financially, free regulated help is available from StepChange, National Debtline and Citizens Advice.