Why cash comes before investing
An emergency fund is not an investment — it’s what makes investing safe. Without accessible cash, the boiler, the redundancy or the cracked timing belt gets paid by credit card at 25% APR or by selling investments at whatever price the market happens to be quoting that week. With it, life’s ambushes are inconveniences, and your portfolio never meets a forced seller. It’s also the licence to be sensibly aggressive elsewhere: people with a year of expenses in cash hold their equities through crashes; people without, often don’t.
How much is enough
The standard answer is 3–6 months of essential outgoings (not income — what it actually costs to run your life). Calibrate to your circumstances:
- Toward 3 months: stable salaried job, in-demand skills, two earners, no dependants.
- Toward 6–12 months: self-employed or variable income, single earner with dependants, poor health, an old house with a temperamental roof — or retirement, where the cash buffer does double duty against sequence risk (see the drawdown guide).
Add known near-term costs on top: money needed within about five years — house deposit, wedding, car — belongs in cash too, whatever the stock market’s recent form. Five years is roughly the horizon below which equities are a coin-flip.
Where to keep it — the hierarchy
Cash should still work for a living. The gap between a high-street account paying 1% and a best-buy paying 4%+ on £20,000 is £600+ a year for ten minutes of effort.
- Easy-access savings accounts — the workhorse. Chase best-buy tables (app-based banks and building societies usually top them); loyalty to a high-street brand is a voluntary tax. Watch for teaser rates that expire after 12 months.
- Cash ISAs — same idea, interest tax-free, uses ISA allowance. Worthwhile if your interest would breach the personal savings allowance (£1,000 basic rate, £500 higher rate, £0 additional rate).
- Premium Bonds (NS&I) — prizes instead of interest; the prize-fund rate (recently in the 3.5–4% region) is decent, prizes are tax-free, and the whole thing is Treasury-backed. Sensible for higher-rate taxpayers with used-up allowances; the “average luck” return needs a large holding to smooth out.
- Notice accounts and fixed-term bonds — better rates for locking money away. Fine for the back half of a large fund, wrong for the front line.
- Money market funds — funds holding very short-term deposits, yielding close to the Bank of England rate, held inside an ISA/SIPP/GIA. Excellent for cash inside wrappers (a house-deposit LISA, a drawdown buffer) but they’re investments, not deposits: no FSCS deposit protection and settlement takes days. They and their cousin, the individual gilt, get their own cash-like investing guide — including a tax edge on gilts that higher-rate taxpayers shouldn’t miss.
The protection limits
UK-regulated deposits are covered by the FSCS up to £120,000 per person, per banking licence (raised from £85,000 in December 2025 — and note some brands share a licence, so check). Above the limit, spread across institutions; joint accounts double the cover; temporary high balances such as house-sale proceeds get £1.4 million of cover for six months. NS&I is 100% government-backed with no ceiling.
The mistakes
Keeping the fund in the same account as daily spending (it evaporates). Keeping six months’ expenses at 0.5% out of inertia. Counting a credit card as the plan. And the opposite error — hoarding years of cash out of nervousness while inflation quietly compounds against it: once the fund is full, the next pound belongs in a wrapper — or, for homeowners, possibly in a mortgage overpayment, which the overpay-or-invest calculator weighs up. Fill the fund first either way: an overpayment is gone the moment you make it.
The one-line summary
Hold 3–6 months of essential spending (plus any within-five-years goals) in genuinely accessible cash, make it earn a best-buy rate, stay inside FSCS limits — then stop adding to it and invest the rest.
Related guides & tools
- ISA investing — where the next pound goes once the fund is full
- Mortgage overpay or invest? — the other candidate for spare money once the buffer is built
- Gilts, money market funds and cash-like investing — the investment-shaped homes for cash beyond deposit accounts
- Protection — income cover, life insurance, wills and LPAs — the same downside-first argument carried past what cash can cover
- Building a diversified portfolio — cash is one leg of the bigger structure
- Lump sum or drip-feed — why the buffer is what lets you stay invested
- Retirement drawdown — the cash buffer’s second career against sequence risk
Last reviewed: August 2026.