In short: an emergency fund is money you don't touch unless you truly have to: a layoff, a big repair, a health surprise. The usual rule of thumb is three to six months of shared fixed expenses, kept in a separate account that's easy to access, not invested. Bank deposits are usually protected only up to a limit, so if the fund grows large, check the limit where you live and consider spreading it across more than one institution.
How much to save: three to six months
The common rule of thumb is to cover three to six months of the household's fixed expenses: rent or mortgage, utilities, insurance, basic groceries. You don't need to include entertainment or other variable spending, because in a real emergency those are the first things you cut.
To decide whether you two should aim closer to three months or closer to six:
- Closer to three months if you both have stable jobs (permanent contracts, steady employment, or several clients if you're self-employed) and your fixed expenses are moderate compared with your income.
- Closer to six months if one of you is self-employed with only a few clients, is on a temporary contract, or if your fixed expenses (especially rent) take up a big chunk of your combined income.
It's not a number you have to hit all at once. You build it with a fixed monthly contribution, treated like any other fixed expense, until you reach the target.
Where to keep it
An emergency fund has one very specific job: to be available right away and not lose value along the way. That rules out putting it in the stock market, in funds, or in anything that could drop right when you need it. The usual choice is an interest-bearing savings account that's separate from your everyday account, so it doesn't get mixed up with the money you spend each month and you don't dip into it without thinking.
One useful thing to check when choosing where to open that account: bank deposits are generally protected by a deposit guarantee scheme, but only up to a limit per account holder and per institution, and the limit depends on the country. If your emergency fund fits under that limit, it's fully covered. If it grows past it (say, because you also keep other short-term savings there), consider spreading it across more than one institution so everything stays within the protected amount. Look up the exact limit that applies to you.
How to split the contribution
As with day-to-day expenses (see the guide on how to split expenses), the contribution to the emergency fund can be 50/50 or proportional to what each of you earns. If your incomes are similar, 50/50 is the simplest. If there's a notable gap, proportional spreads the effort more evenly.
What matters is treating it as an automatic transfer at the start of the month, not something you do "if there's anything left over." An emergency fund that depends on money being left over at the end of the month almost never gets finished.
An example of how to build it
Take a couple with $2,600 a month in shared fixed expenses (rent, utilities, insurance, basic groceries). With the three-to-six-month rule of thumb, their target is between $7,800 and $15,600. If they put in $150 a month between the two of them, into a separate interest-bearing account, they'd reach the low end (three months) in 52 months, a little over four years. If they can put in $300 a month, the time is cut in half. Seeing it in months helps you decide whether to start with a smaller contribution and raise it later, or push hard from the start to get the cushion sooner.
What counts as an emergency and what doesn't
An emergency fund loses its point if you use it for expenses that were actually predictable. Before you touch it, it helps to tell the difference:
- It is an emergency: a big, unexpected repair (the furnace, or the car if you need it for work), a stretch without income after a layoff or the end of a contract, an urgent medical expense that isn't covered.
- It's not an emergency, it's an expense you forgot to budget for: the annual car inspection or registration, car insurance, holiday gifts, a vacation. These come back every year and should have their own line in your monthly budget (see the couples budget guide), not come out of the emergency fund.
If you do use the fund for something that wasn't a real emergency, the healthy move is to replenish it as soon as you can, like you would with any other savings you spent, so you don't hit the next real surprise with an empty cushion.
Shared savings goals, beyond the emergency fund
Once the emergency fund is covered, couples often find new shared goals: a down payment on a home, a wedding, a sabbatical year, a car. For those goals, it helps to:
- Give them a specific number and a target date, not just "save more."
- Keep them in a different account from the emergency fund, so you don't mix the money you don't touch with the money you're building up for something specific.
- Decide ahead of time how the contribution is split (50/50, proportional), and revisit it if either of your incomes changes.
General information, not financial, tax, or legal advice. For your specific situation, talk to a professional.