This is the single highest-value thing in personal finance and the least exciting. Everything else in a plan works better once it exists.
How much you need
The answer is a number of months of essential outgoings, not a round figure someone quoted at you. Essential means rent or mortgage, utilities, food, transport, insurance and minimum debt payments — not your whole budget.
| Your situation | Target | Why |
|---|---|---|
| Single income, stable employment | 3 months | Enough to absorb a gap between jobs. |
| Two incomes, both stable | 3 months of the joint total | Both failing at once is unlikely. |
| Single income, dependants | 6 months | More people relying on the same recovery. |
| Self-employed or irregular income | 6 to 12 months | Income gaps are normal rather than exceptional. |
| Approaching retirement | 12 months | Less time to recover, and less appetite for selling investments in a fall. |
| Owning property | Add a repair reserve | A roof or a boiler is not an emergency, it is a certainty with an unknown date. |
Work out the real number
Add up one month of essentials from your actual statements, not from memory. Most people overestimate their rent and underestimate everything else.
Where to keep it
Three requirements, in order: you can reach it within a day, its value does not move, and it is far enough away that you do not spend it by accident.
- An instant-access savings account, separate from your current account, is the right home for almost everyone.
- Keep it at arm’s length: a separate pot with a name on it, not sitting in your current account balance.
- Do not invest it. A fund that is down 20% on the day you need it has failed at the one job you gave it.
- Do not tie it up in a fixed-term product for a slightly better rate. Access is the point.
- If it is large, splitting it between instant access and a short notice account is a reasonable compromise.
A credit card is not an emergency fund
It converts an emergency into a debt at the worst possible moment, and it can be withdrawn by the lender exactly when your circumstances change.
Building it when money is tight
- 1Start with one month, not six. A six-month target is discouraging enough that many people never begin.
- 2Automate a transfer on payday, before you have adjusted to the money being there. Any amount works; consistency matters more than size.
- 3Route irregular money straight into it: refunds, bonuses, a tax rebate, the proceeds of selling something.
- 4Increase the transfer whenever your income rises, before your spending absorbs it.
- 5When you use it, restart the transfer immediately. Refilling is part of the plan, not a failure.
The first thousand matters most
Most household financial emergencies are smaller than people expect. A modest buffer removes the majority of situations where borrowing would otherwise be the only option.
What counts as an emergency
| This is | This is not |
|---|---|
| Losing your job or a major contract. | A holiday you decided to book. |
| An urgent medical or dental cost. | An upgrade to a phone that still works. |
| An essential repair to your home or car. | A car you would prefer to the one you have. |
| Travelling urgently for a family crisis. | A wedding you have known about for a year. |
| A sudden drop in income. | A sale ending on Sunday. |
The test is whether it is unexpected, necessary and urgent. Something predictable belongs in a savings goal with a date on it, which is a different pot and a different decision.
Documents you may also need
Financial Planning
Working out what your money is for, in the right order: an emergency fund first, then the goals with dates on them, then the long horizon.
Financial PlanningPersonal Goals
Turning "one day" into a monthly figure with a date on it: how to size a goal, where to keep the money, and what to do when you fall behind.
Financial PlanningTax-Efficient Saving
Using the allowances you already have, in the right order, before reaching for anything complicated — and why the tax tail should not wag the dog.
This document was last updated on 1 August 2026. We publish the current version here at all times; superseded versions are available on request.
If anything on this page is unclear, write to us and we will explain it.