Almost every piece of advice about emergency funds starts with "three to six months", and almost every one fails on the next word. Three to six months of what? If it is salary, the number is so large that most people do the sum once, see that it means two years of saving, and never start.
The right measure is three to six months of essential costs, not of income. That is an enormous difference, because essential costs are only the part of your month that does not stop if everything else stops: the home, food, utilities, transport to work, health. What you spend when life is running normally does not belong here.
And there is a second correction, more useful still: the first target is not six months, it is one. Six months is a destination. One month is a step, and it is the step that changes something straight away.
How to calculate an emergency fund: what is your household's essential number?
Whatever you would still be paying in a month where everything else got cut.
Take your budget and cross out everything you would stop without much drama: going out, subscriptions, clothes, presents, the part of the groceries that is taste rather than food. What is left is your household's floor, and that is the number you multiply.
Almost everyone is surprised here, and pleasantly: the floor is appreciably lower than a normal month. A fund that looked impossible when counted in salaries becomes something you can build.
If you cannot separate the essential from the rest, it is because the costs are not sorted yet, and that is the first job. How to sort them is in fixed bills and variable spending.
How big should an emergency fund be, and how many months?
In steps, and the first is the only one that matters today.
| Step | How much | What stops happening |
|---|---|---|
| First | 1 month of essentials | A breakdown stops ending up on a credit card |
| Then | 3 months of essentials | A month without work does not force a rushed decision |
| If there is a reason | 6 months of essentials | Irregular income, or one source supporting the household |
Anyone with a stable contract and a second income in the house lives well on three. Anyone freelancing, on commission, or the only person supporting the household needs six, and really does need it.
What is never worth doing is standing still staring at the six months. One month of essentials already catches the overwhelming majority of the real emergencies that happen in a life, which are breakdowns, unexpected travel and medical bills, not prolonged unemployment.
Where should you keep an emergency fund?
Somewhere you can reach in two or three days, separate from day-to-day money, and with no risk of being worth less when you need it.
Three requirements, and the third rules out a great deal. An emergency fund does not get invested: it is not money for growing, it is money for being there. If it can be worth less on the day you need it, it has stopped doing the job it exists for, and the day you need it tends to be exactly one of those days when the markets are not doing well either.
The first requirement rules out the opposite: a fixed-term deposit with a heavy penalty, or anything that takes two weeks to arrive, does not work either. You need days, not minutes and not weeks.
The second requirement is the most forgotten. If the fund sits in the account where you get paid and pay things, it is not a fund, it is a balance. You will spend it without deciding to, because it shows up as available every time you look. A separate account, even at the same bank, solves this at no cost.
Is the emergency fund the same as the pot for annual costs?
No, and confusing the two is the most expensive mistake in this subject.
Car insurance, road tax, the service and the dentist are not emergencies. They are perfectly foreseen costs that simply do not happen every month, and they need a monthly share of their own, as set out in how to build a budget that survives month two.
Anyone without that drawer uses the emergency fund for the car service. It is understandable and it is fatal: the fund empties into costs that were known in advance, and then a real emergency turns up and there is no fund. The question that separates the two is short: was this already known to be coming? If yes, it is not an emergency, it is missing planning.
When do you touch the emergency fund?
When the cost passes all three questions at once.
- Is it unexpected? It was not planned, and it was not foreseeable.
- Is it necessary? You cannot not do it, or putting it off costs more.
- Is it urgent? It has to be now, not in three months.
All three. A phone that breaks passes all three; a new phone because a new model came out passes none. Travelling for a funeral passes all three. A holiday that happens to be on offer fails the first.
This looks rigid and it is deliberate: the only way a fund is there on the day it is needed is by having survived all the days when it was tempting.
And after using the emergency fund?
You refill it before any other savings goal.
Using the fund is not a failure, it is the fund working. What is a failure is going a year without one because saving went back to being for something else. Until the fund is refilled, it is the first destination for whatever is left over, ahead of any goal.
And if refilling takes six months, that is fine. What matters is the direction, and half a fund is far better than zero and a plan.
In a two-person household, whose emergency fund is it?
The household's, if the costs are the household's, and that has a practical consequence.
If the two share rent and bills, the emergency worth covering is the household's, and the fund makes sense in the joint account, with one condition: both have to know it is not available balance. A fund that shows up as money left over lasts until the first temptation of either person.
Each should also keep some slack of their own, and that lives in their own account. The setup that sorts this out without arguments is in joint, separate, or the three-account setup.
Where to start your emergency fund, today
Three things, and the first is a two-minute sum.
- Work out your essential month. The budget minus everything you would stop. It is the number you multiply, and it is lower than you expect.
- Open a separate account and put in what you can today. Even if it is little. A fund started is a different category from a fund planned.
- Automate a small transfer for payday. Small and automatic beats large and voluntary, every month of the year.
The goal of the first step is not financial security. It is to stop solving a three-hundred-euro problem with credit that costs a great deal more than three hundred euros, and that is achieved well before everything else is sorted.
We keep a page of frequently asked questions about budgeting and everyday money, with a short answer to each one and the full piece one click away. If you want to see it, it is here: frequently asked questions.
This is educational writing. It is not financial advice or an investment recommendation; for advice on products, speak to a professional registered with the CMVM.