Almost every financial article tells you to keep 3–6 months of expenses in cash. But 3 months and 6 months are very different amounts of money, and neither figure accounts for the fact that your situation is specific. A self-employed freelancer with a mortgage and two children needs a very different cushion than someone in permanent employment, renting, with no dependants.
Get the definition right first
It's months of expenses — not months of salary.
Essential expenses are: rent or mortgage payment, council tax, utilities, food, transport to work (if job-seeking), insurance, minimum debt payments, and childcare if non-negotiable. They don't include holidays, restaurants, gym memberships, subscriptions, or the parts of your spending that would naturally fall away in a crisis.
Calculate this number specifically for your household. It is almost certainly lower than your monthly salary — and that's what you should multiply by 3 or 6.
How much do you actually need?
Your situation determines where in the 3–6 month range you sit.
| Your situation | Target fund | Why |
|---|---|---|
| Permanent employment, renting, no dependants | 3 months | Stable income, low fixed costs, flexible if job lost |
| Permanent employment, mortgage, no dependants | 3–4 months | Fixed mortgage adds a floor to essential costs |
| Permanent employment, mortgage, children | 4–6 months | Childcare and dependant costs make a gap more expensive |
| Single income household, mortgage, dependants | 6 months | No second income to fall back on — higher risk |
| Self-employed or variable income | 6–12 months | Income is uncertain; a quiet month isn't an emergency but shouldn't be a crisis |
| Contract worker, short-term renewable contracts | 6 months | Gaps between contracts need bridging without panic |
Where to keep it
It needs to be accessible. Not invested. Not locked.
An emergency fund that's hard to access isn't an emergency fund — it's just savings with an inconvenient name. The whole point is that it's there when you need it quickly, without penalty.
The right home for an emergency fund. Instantly accessible, no withdrawal limits, currently paying competitive rates (often 4–5% AER at major banks and challengers in 2024–25). Keep the full fund here.
Identical liquidity to a savings account but with tax-free interest — useful if you're a higher-rate taxpayer who'd otherwise pay tax on savings interest. Your £500/£1,000 personal savings allowance covers most people at lower balances.
Do not keep your emergency fund in investments. Markets can fall 30–40% precisely when jobs are at risk — economic downturns hit employment and portfolios simultaneously. An emergency fund that's down 35% when you need it is not an emergency fund.
Capital-secure and prize-based rather than interest-bearing — effectively 4%+ equivalent for most holders in recent years. Accessible within a few working days. Fine as part of an emergency fund, but not instant-access, so keep some in a true easy-access account.
Better rates but locked for 1–5 years with penalties for early access. Not suitable for an emergency fund — you may need this money precisely when the lock-in prevents you from getting it.
Common mistakes
Two things go wrong most often.
Not enough — relying on credit cards in a crisis
A job loss followed by 3 months of credit card borrowing at 25% APR can spiral quickly. People who rely on credit in emergencies often find they're in worse financial shape two years later than if they'd never lost the job at all.
Risk: high-interest debt in an already stressful situationToo much — holding 12+ months in cash when returns are mediocre
Beyond your target emergency fund, cash sitting in easy-access savings is a drag on long-term returns. Money beyond 6 months of expenses that isn't needed for a near-term purchase (house deposit, car) should typically be invested. Idle cash is a cost.
Opportunity cost: excess cash loses to inflation and market returns over timeUniversal Credit and Statutory Sick Pay exist in the UK and reduce — but don't eliminate — the need for an emergency fund. UC waiting periods, benefit caps, and means testing mean many households won't receive enough to cover their essential costs in a crisis. The safety net softens the floor but doesn't remove the need for a personal cushion.
How much do you actually need — given your specific situation?
Franky asks about your income stability, housing costs, dependants, and employment type — then gives you a clear target and tells you where you stand.
Talk to Franky →