Belgian sources disagree about your emergency fund by a factor of four

Ask nine Belgian sources how big a buffer should be and the answers span €6,900 to €27,600 for the same earner. The gap between the lowest and the highest is €20,700, and the years you spend closing it are years you are not investing.

We took €2,300 because Spaargids and HLN both work their own examples at exactly that amount. Here is what each source told the same person in August 2026.

Nibud is on that list because Belgian pages keep sending readers to it, not because it is Belgian. It is the Dutch national budget institute, and its BufferBerekenaar gives you a personal figure instead of a rule of thumb.

Two of those numbers come from the same publisher

DPG Media publishes both six to twelve times your salary and three to six times your salary, and Spaargids contradicts itself inside a single article.

Spaargids tells you to hold six to twelve times your net monthly salary, and works it out: on €2,300 net a month, €13,800 to €27,600. Further down the same article, it says that if you managed to set aside more than three to six times your net monthly salary, you can invest whatever is above that. So one page tells you to hold six to twelve times your salary and to invest everything above three to six times it.

HLN publishes the same material, written with Spaargids, and gives the rule as three to six months of net monthly salary, worked at the same €2,300 to give €6,900 to €13,800. DPG Media owns both titles. That is half the recommendation from one publisher, on the same source material, for the same reader.

The rules disagree because they size for two different disasters

Income-based rules size for losing your income. Expense-based rules size for things breaking. Treating the two as interchangeable is where the factor of four comes from.

Nibud is the clearest about the split. Its buffer covers unexpected, larger and necessary purchases, and it says in its own words that money for falling or variable income has to be saved separately. Belgian pages borrow the number anyway. Budgetwijzer links the BufferBerekenaar outright, Crelan cites it, and Google's AI Overview sends readers to the calculator. So a Belgian reader is handed a Dutch number that was built to exclude the risk they worry about most.

Sizing on expenses is the version that matches what an emergency fund actually pays for, which is why it is the one we use.

Which money belongs where, in order

An emergency fund comes second in a fixed order: after any expensive debt, and before both your named savings goals and your investments. You fill each layer before the money flows down to the next, like a waterfall.

1. Pay off expensive debt.
2. Build your emergency fund.
3. Save for the short-term goals you can already name.
4. Invest what is left.

The distinction that does the real work sits between the second and third layers. An emergency fund is for the unexpected: a broken car, an urgent repair at home, a medical bill you did not see coming. Money you are putting aside for a car, a renovation or a trip is a savings goal, not an emergency fund. Mixing the two is why so many people feel their buffer is never big enough, and why "I am still saving for my buffer" becomes the reason they never start investing.

There is a third boundary worth naming, because it catches people who have already started. A portfolio is not an emergency fund. A long-term portfolio makes you resilient over decades, while an emergency fund makes money available this week. Those are different jobs and they need different homes.

Giving each goal its own bucket keeps them apart in practice. Take someone with €500 a month to put aside: €200 goes into a holiday bucket on a savings account, €300 into a long-term bucket in index funds. Each bucket has its own horizon, so each one gets its own home. We look at how to treat short-term savings goals differently from long-term ones in more detail elsewhere.

Expensive debt comes before the buffer

If you are carrying a credit-card balance or a consumer loan, paying it off beats both saving and investing. A credit card at 15% a year hands you a guaranteed 15% return on every euro you repay, and no index portfolio matches that reliably. This is not about your mortgage, which is a different question entirely.

Three to six months of your expenses, and your job decides where in the range

Set your emergency fund at three to six months of your expenses, not your income, and let the security of your income decide where in that range you land.

Expenses win over income because the buffer's job is to keep your bills paid while something is repaired or replaced, and your salary is not what your bills cost. Sizing on income makes you hold too much if you save a large share of it, and too little if you spend all of it. Two people on €2,300 net with very different spending need very different buffers, and only the expense rule notices.

The range stops at six months because an emergency fund is a fixed target with an end point, not something you grow indefinitely. Past the target your own situation calls for, each extra euro buys very little additional safety and starts costing you real money.

Where you land inside three to six months is a question about your income rather than your expenses. Someone on a permanent civil-service contract can get a long way on three months. An employee on a permanent contract sits in the middle. A freelance graphic designer whose assignments can dry up overnight belongs at six, and may want more.

The last word goes to whatever lets you sleep. The point of an emergency fund is that the ups and downs of your investments barely touch you, so if six months of expenses does not give you that, hold more. That is a choice, and it has a price. Curvo co-founder Yoran Brondsema runs a business, treats that as riskier than full-time employment, and holds six months of expenses himself. You can read how he arrived at his own emergency fund and what he keeps where.

Most people underestimate what they spend each month

Asked what they spend in a month, most people name a figure well below what they actually spend, because the irregular costs never come to mind. Annual insurance premiums, holidays, maintenance, school bills and car repairs are all real, and none of them shows up in a typical month. In Hangmatbelegger voor het leven, the book Curvo co-founder Yoran Brondsema wrote with Tim Nijsmans, the gap comes out at roughly a quarter: people who believe they spend around €2,000 a month often turn out to be closer to €2,600 once the irregular costs are counted.

The Belgian figures put a floor under that. Statbel, the Belgian statistical office, runs a Household Budget Survey, and its 2024 edition is the most recent one with euro amounts published. It covers 5,696 households, weighted to the Belgian population.

• A Belgian living alone spent €32,187 a year, which is €2,682 a month.
• A two-person household spent €47,083 a year, or €3,924 a month.
• Across all households the average was €44,270 a year, and €20,620 per person, which is €1,718 a month, because larger households spend less per head.
• Housing, water, electricity, gas and other fuels is by far the largest line, at €13,536 per household per year.

Run three to six months against those numbers and you get a buffer. For a Belgian living alone at the average, that is €8,000 to €16,100. For a couple, €11,800 to €23,500. Both are arithmetic on Statbel's figures, and they are a starting point until you have your own number.

They also work as a check on the rules from the banks. The expense rule lands a single Belgian at the average somewhere between €8,000 and €16,100. Spaargids's salary rule puts the same person's ceiling at €27,600, which is more than ten months of everything they spend.

Three ways to find your own number

You can map your expenses with an app, with your account balances, or with three months in a spreadsheet. All three work, and the effort you put in is roughly the accuracy you get out.

Some budgeting apps connect to your bank accounts and categorise everything for you, which is the least work. If you already know your income, you can track your account balances instead: whatever your balances gained over a period is what you saved, and the rest is what you spent. Or keep three months of expenses in a spreadsheet by hand. That takes more effort, and it pays you back by showing you the subscriptions you stopped using. Whichever method you pick, look back over a full twelve months before you settle on a figure, because that is the only window that catches the annual insurance premiums, the holidays, the maintenance and the school bills.

The same exercise tells you what you can invest

Mapping your expenses to size your buffer also gives you your investing budget, because your savings capacity is your income minus your expenses. The same hour of work answers both questions.

That subtraction catches out the self-employed in particular. Someone invoicing €5,000 a month can easily assume €5,000 is available to live on, save and invest. After VAT, social contributions, business costs and taxes, it may be closer to €2,800. Once you know both halves, you can work out your monthly investment budget properly.

What your emergency fund costs you

Keeping three to six months of expenses on a savings account is not free. Over the last thirty years, €100 on a Belgian savings account held on to €75 of its purchasing power, while the same €100 in a global index grew to €525 of purchasing power.

Here is the full comparison. Take €100 in January 1996 and measure what it was worth in December 2025, in purchasing power rather than in euros on a statement.

• Under a mattress it was worth €51, with no interest and thirty years of Belgian inflation against it.
• On a Belgian savings account it was worth €75. The interest the banks paid recovered part of the loss, and only part.
• In the MSCI ACWI IMI, a global index covering developed and emerging markets including smaller companies, it was worth €525.

Even with interest, a Belgian savings account gave up a quarter of its purchasing power over those thirty years. The global index more than quintupled its purchasing power.

The three figures come from two primary series and our own tool. Belgian inflation is Eurostat's harmonised index of consumer prices. The savings rate is what Belgian households actually earned on savings deposits, collected by the National Bank of Belgium and published by the European Central Bank. The index figure comes from our own Backtest tool, with net dividends reinvested and before fund costs and taxes. You can run the same chart yourself.

Belgian savings rates lost to inflation in 84% of months since 2003

Between January 2003 and December 2025, Belgian inflation ran above the interest on a savings account in 232 of 276 months, which is 84% of them. On Eurostat's harmonised index of consumer prices, average Belgian inflation over that period was 2.45% a year, against an average savings rate of 0.83% in the ECB's series.

The worst of it is recent. Belgian inflation reached 13.1% in October 2022, while savings rates followed slowly and from a long way behind.

None of this looks like a crash. There is no red line diving in a single day, and the balance on your statement never moves. That is exactly why people underestimate it: the number on the screen stays the same while what it buys shrinks. We take the purchasing power of savings apart in more detail in its own article.

That cost is a premium, and it is worth paying on the buffer you actually need

An emergency fund is insurance, not an investment, and the return you give up is the premium you pay for it. You accept a lower return in exchange for peace of mind and money you can use the same day. On the day an unexpected €1,500 invoice arrives, same-day availability is worth far more to you than a few percent a year.

The premium is worth paying on the buffer your own situation calls for. It stops being worth paying on the money above that target.

Keep your emergency fund on a regulated Belgian savings account

A regulated Belgian savings account is the right home for an emergency fund, and its tax treatment means the interest on a buffer is almost certainly tax free. It does not belong on the stock market, and certainly not in crypto. Same-day availability is the entire point, so anything that delays access fails the one test this money has to pass.

Your money is also well protected. Deposits at a bank licensed in Belgium are protected up to €100,000 per person per bank by the Garantiefonds voor financiële diensten, part of the Belgian federal finance department. Every other country in the European Economic Area runs its own scheme with the same €100,000 ceiling. That is comfortably more than any emergency fund needs.

Then there is the tax rule, and this one is genuinely Belgian. Belgium has regulated and unregulated savings accounts, and most accounts at classic Belgian banks are regulated. On a regulated account, FOD Financiën exempts the first €1,020 of interest per person from withholding tax, and charges 15% on interest above that instead of 30%. Those amounts apply to income year 2025 and income year 2026.

The exemption belongs to the taxpayer, not to the account. The tax authority's own guidance for the 2026 assessment year states that married and legally cohabiting partners are each separately entitled to a €1,020 exemption, so a couple shelters €2,040 of interest whether they hold one joint account or two.

To see what that covers, take a savings account paying 1.5%. At that rate, €1,020 of interest corresponds to roughly €68,000 of savings, which is €1,020 divided by 1.5% rather than a published figure. For almost every emergency fund in Belgium, the interest is tax free.

Unregulated accounts work differently: 30% withholding tax from the first euro of interest, and accounts at foreign banks and brokers usually fall into that regime. On a foreign account nothing is withheld at source, so you declare the interest yourself and pay the 30% with your tax return. A higher headline rate can leave you with less than a lower one. Rates between Belgian savings accounts differ enough to be worth an hour of comparison, and availability and safety still come before the highest rate.

A current account is not the place

Keep about two months of expenses on your current account and the rest of your buffer on a savings account, because only the savings account pays interest. That is the split Curvo co-founder Yoran uses himself. It keeps enough cash where you can spend it today, and stops the rest sitting idle.

What about a term account or a money-market ETF?

Term accounts and money-market ETFs both pay more than a savings account, and both fail the one test an emergency fund has to pass.

A term account locks your money up for a fixed period. That is precisely why it pays more, and precisely why it does not work as a buffer, because you do not know when you will need the money. A deposit ladder helps and adds complexity, and in Belgium a term account is taxed at 30% from the first euro of interest.

Money-market ETFs hold very short-dated debt and generally follow €STR, the euro short-term rate published by the European Central Bank. They can be interesting when rates rise faster than banks adjust their savings rates. They have to be bought and sold through a broker, which slows your access down and adds broker costs and Belgian stock-exchange tax. For a short-term savings goal, either can make sense. For an emergency fund, a regulated savings account wins.

Your emergency fund is finished, and then the money has a different job

An emergency fund is the one savings goal that finishes, so the moment you reach it, the next euro you save has a different job. This is the point that costs people the most. Plenty of them use the buffer as an unconscious excuse never to start investing, and two, three or four years go by on the same sentence: "I am still saving for my buffer."

You do not have to wait for the buffer to be complete either. Once you are most of the way there, split your monthly saving so that part finishes the buffer and part goes to your investments. The habit starts now rather than in eighteen months, and the buffer still gets finished.

Review the target once a year, because your situation moves. Children, a house, a new job, higher expenses: every one of them changes the number you want behind you.

The useful question is never whether you are allowed to hold something besides index funds. It is what role each thing plays. A savings account is for your emergency fund and your short-term goals. A long-term portfolio is for long-term wealth over decades. Once each one is doing its own job, neither has to do the other's.

Spending your emergency fund means it worked

The day you have to spend your emergency fund, nothing has gone wrong. That is the system doing exactly what you built it for. Afterwards, lower your monthly investment for a while and use that money to refill the buffer, then go back to your normal plan once it is at target again.

If the buffer was not enough and you do have to sell investments, sell only what you need. Beginners tend to think in all-or-nothing terms, and usually only a part is needed. Everything that stays invested keeps growing. This is one place where an index fund beats a property: you can sell the exact amount you need during market hours, while a house sells whole and takes months.

If your income falls, your contribution can fall with it. Losing a job, going self-employed, working less, taking parental leave: all of them are reasons to put less in for a while, and a month of not investing is not a disaster. Pausing is allowed. Set a reminder to restart, because that is where it usually goes wrong. People pause "for a bit" and then the habit never comes back.

When money arrives rather than leaves, run the waterfall again before you invest more of it. Your emergency fund may need to be bigger than it was when you set the target, and you may have picked up short-term goals since. The order does not change just because the amount did.

Conclusion: sizing your emergency fund, and knowing what it costs

Belgian sources disagree about your emergency fund by a factor of four because they are sizing for two different disasters without saying so. Once you decide the money is there to pay bills while something is replaced, the rule follows: three to six months of what you spend, with the security of your income deciding where in that range you sit. A civil servant near three, a freelancer at six or beyond.

The part the banks leave out is what the buffer costs. Over the last thirty years, €100 on a Belgian savings account held €75 of its purchasing power while €100 in a global index grew to €525. That gap is the premium you pay for money you can use today, and it is worth paying on three to six months of expenses. Knowing the number is what stops you holding four times what you need for another ten years, and none of the Belgian pages that recommend a buffer puts a number on it.

So work out what you actually spend, set the target, and then give the money above it a different job. With Curvo, that second part takes a few minutes to set up and then runs on its own, while your buffer stays exactly where it belongs.