Budgeting4 min read

Emergency fund: how much you need and how to actually build one

The answer isn't "six months of salary". How to work out your number from your essential expenses, which currency to hold it in, and what counts as an emergency.

September 2, 2026

"Three to six months of salary" is the answer everyone gives, and it's a weak one for two reasons: it isn't calculated on salary, and "three to six" is a range wide enough to decide nothing.

An emergency fund is calculated on your essential expenses, not on what you earn. Someone who earns a lot and spends little needs a small fund; someone on the same income living at the edge needs a big one. Salary can't tell those two apart.

Step 1: your essential month

Take the last three months you've logged and add up only what you'd still be paying if your income stopped tomorrow:

Rent or mortgage, service charges, utilities
Everyday food
Minimum transport
Health: insurance, medication
The minimum payment on every debt
Insurance policies

And take out everything else: going out, clothes, entertainment subscriptions, travel, gifts. Not because they're wrong, but because in an emergency you pause them.

The average of those three months is your essential month. That's the base number.

If you've never tracked your spending, this can't be estimated from memory: everyone underestimates their essential month by 20% or 30%. Three logged months are enough, and how many categories you need helps you set it up without overcomplicating it.

Step 2: how many months, given your situation

This is where the generic range turns into an actual decision. Add them up:

Base: 3 months.
+1 month if your income is variable (freelance, commission, gig work).
+1 month if you're the only earner in the household.
+1 month if people depend on you.
+1 month if you work in a field where finding something new takes time.
−1 month if you have severance or unemployment cover for part of it.

A salaried worker with no dependants in a field with demand: 3 months. A freelancer supporting a household: 5 or 6. The maths isn't sophisticated, but it gives you a number of your own instead of a range off the internet.

Step 3: which currency to hold it in

In a stable economy the question doesn't come up. Where the local currency loses value quickly it does, and the practical answer is: the fund should sit in the currency you'll spend it in, or in one that doesn't melt.

What tends to work in practice is splitting it: a small, liquid portion in local currency — for what happens tomorrow — and the rest in whichever stable currency you actually use. What doesn't work is putting the whole fund in a 90-day deposit: a fund you can't reach the same day isn't an emergency fund, it's savings.

If you end up holding money in two currencies, log it that way instead of converting in your head — the reasoning is in tracking two currencies.

Step 4: how to fill it without it hurting

The final number is intimidating. Six essential months can be half a year of income, and staring at the whole thing is the best way never to start.

What works:

Set an intermediate goal. One essential month. That first month is what gets you out of "any surprise goes on the credit card".
Automate it on payday, not on the 28th. What's left at month end isn't left.
Start with a small, real number. 5% held for twelve months beats 20% held for two.
Windfalls go straight in until you hit the goal: a bonus, a refund, a one-off job.

What counts as an emergency and what doesn't

An emergency is unforeseen, necessary and urgent. All three.

The fridge died: yes.
You lost your job: yes.
A medical emergency: yes.
The holiday: no, that's foreseeable — save for it separately.
The annual tax bill: no, you knew the date. That gets spread across the months.
A really good deal: no.

The distinction matters because a fund used for foreseeable things never gets full. The expenses you know are coming but that don't happen monthly — insurance, registration, servicing — have their own place in the monthly budget.

In one line

Calculate it on your essential expenses rather than your salary, add months based on your real situation, keep it liquid and in the currency you'll spend it in, and fill it on payday with a percentage you can hold all year.