Read anything about personal finance and the same rule turns up: keep three to six months of expenses set aside for emergencies. It is a fair starting point. What is rarely explained is how to choose between three and six, or which expenses to count.
That gap matters. For the same person it can mean twice as much money sitting in reserve, money that is not being invested or paying down debt. So the figure should reflect your situation, not a generic rule.
This guide sets out what I found when comparing approaches: how to work out your essential costs, what pushes you towards three months or beyond six, and where to keep the money in Spain so it is there when you need it.
What an emergency fund is, and what it is not
It is money with one job: absorbing a shock without forcing you to borrow or sell investments.
An emergency fund is a cash reserve for costs you cannot predict or postpone. Cash here means money you can reach within a day or two without it losing value when you take it out.
It is meant for situations like these:
- Losing your job, or months of reduced income.
- A serious repair at home, or to the car you need for work.
- A medical, dental or family expense that cannot wait.
It is not for holidays, gifts or a good deal. Those costs can be planned, and savings goals exist for that. Mixing them in drains the fund without you noticing. The point is simple: the fund exists so that one surprise does not undo every other decision you have made.
How much to keep: start from your essential costs
The base is neither your salary nor what you spend in a normal month, but what you need to live on once everything optional is cut.
Essential costs are the ones you would keep paying even if your income dropped overnight. They usually include:
- Housing: rent or mortgage payment, community fees and a monthly share of IBI (property tax).
- Utilities: electricity, water, gas, internet and phone.
- Food and household basics.
- Transport to get to work, or to look for it.
- Insurance and any loan payments you cannot pause.
Leisure, subscriptions, non-essential shopping and saving for other goals stay out. In an emergency you would cut them. That is why essential costs are usually well below your total monthly spending.
A practical way to find the number is to go through two or three months of bank statements and mark only what is essential. Annual bills, like insurance paid once a year, are divided by twelve. The result is your unit: the fund is that figure times a number of months.
Three months or six: what decides it
The number of months reflects how long it could take to restore your income, and how many things could go wrong at once.
Three months is a sensible floor for almost anyone. From there, each risk factor pushes the figure up. These carry the most weight:
| Factor | Closer to 3 months | Closer to 6 or more |
|---|---|---|
| Job security | Permanent contract or public-sector post | Temporary contract or sector with frequent layoffs |
| Income pattern | Fixed monthly salary | Variable pay, commission or self-employment |
| Household income | Two independent salaries | A single salary |
| Dependants | None | Children or relatives who rely on you |
| Home and car | Renting, with the landlord handling repairs | Owning your home, or an older car |
| Finding new work | In-demand profile | Small or highly specialised field |
Spanish unemployment benefit (paro), if you qualify, also counts. It depends on your contribution record and rarely replaces your full salary. For the self-employed (autónomos), the equivalent cover has stricter conditions, which is why they usually need more months.
At the other end, more than about twelve months rarely pays off: beyond that, idle money could be working towards other goals. The takeaway: the more factors from the right-hand column you recognise, the closer to six months, or above, your fund should be.
Three examples of sizing an emergency fund
Same method, different lives: essential costs times months of cover.
The figures are illustrative. They show how the result moves when the factors above change.
couple with two stable salaries
Both have permanent contracts, they rent and have no children. Their essential costs come to €2,000 a month. If one loses their job, the other salary keeps coming in. At 3 months, their fund would be €6,000.
one salary, a mortgage and a child
Someone on a fixed salary who is the only earner at home, with a mortgage and a child. Essential costs are €1,800 a month. There is no second income to cushion the blow, and owning a home adds its own surprises. At 6 months, the fund would be €10,800.
self-employed with variable income
Works project by project, with good months and slow ones. Essential costs are €1,500 a month. The fund has to cover both a bad patch and gaps between invoices. At 9 months, the fund would be €13,500.
Notice that Profile C, with the lowest costs, needs the largest fund. What sets the figure is not how much you spend but how long you might go without enough income. To run the numbers for yourself, the guide to getting your finances in order includes a cushion calculator that shows how many months you cover today.
Where to keep your emergency fund
It has to be reachable within days and must not drop in value just when you need it. Within those limits, it may as well earn something.
The usual options in Spain, from most to least immediate:
- High-yield savings account (cuenta remunerada): pays interest and lets you withdraw at any time. Check whether the rate has a balance cap or is only a promotional offer for a few months.
- Term deposit (depósito a plazo): a fixed return in exchange for leaving the money for a set period. It only fits if early withdrawal is allowed, even with a small penalty.
- Money market fund: a fund that invests in very short-term debt. Its risk is low but not zero, and redemptions usually take a few business days.
Accounts and deposits at banks that belong to Spain's Deposit Guarantee Fund (FGD) are covered up to €100,000 per depositor per bank. Money market funds have no such guarantee. The stock market does not belong here: a fall could arrive at the same time as a drop in income.
At one point, saving for a specific goal, I left the money completely idle because I was afraid of losing it. Looking back, I understand now that I was avoiding one risk while quietly accepting another: inflation was wearing it down. A high-yield savings account would have kept the same access with minimal risk.
Profile B's fund left in a current account versus different returns, assuming 2 % inflation. Change the inputs to try your own case.
Idle savings vs. inflation vs. compound growth
- Idle, in euros10.800 €
- Idle, in purchasing power9782 €
- At 1 % a year11.351 €
- At 2 % a year11.924 €
- At 3 % a year12.520 €
2 % is the European Central Bank's medium-term inflation target; actual inflation can be higher or lower. The difference from one year to the next is small, and that is fine: the fund's job is to be there, not to earn. But given two equally accessible options, the one that pays something holds its value better. The article on why a PIAS with no interest loses purchasing power looks at this effect in more detail.
How much to save each month, and when to review it
An emergency fund is built in stages. Every month you cover already buys you room.
Starting from zero, the full amount can feel far away. It helps to treat it like any other goal: an amount, a deadline and a monthly contribution. For example, Profile B's €10,800, putting aside €300 a month, is complete in 36 months.
A first milestone within reach
The savings goal calculator shows how much to set aside each month for the deadline you choose, or when you would get there at your current pace. For the maths step by step, see how much to save each month to reach a goal.
Once it is in place, three signals to review it:
- You have used it: refilling it comes before other savings goals.
- Your life has changed: a child, a mortgage, a new job or going self-employed changes both your essential costs and the months you need.
- Time has passed: costs rise over the years. Reviewing the figure every 6 to 12 months keeps the fund from quietly falling short.
With the fund complete, whatever you keep saving can go elsewhere: expensive debt, the mortgage or long-term investing. The article on what to do with €10,000 in savings suggests an order for deciding.
There is no universal figure. The right fund is the one that lets you sleep at night without leaving more money idle than you need.
Run the numbers for your situation: