Sinking funds

The transmission fails in March and the garage wants €1,800. On an installment loan at 14% over two years, that repair costs €2,074 — the €1,800 plus €274 in interest. Saving €90 a month for twenty months costs €1,800 and nothing else. The repair is not the emergency. The absence of a fund for it is.

Most emergencies were on the calendar

A sinking fund is a separate savings balance for one specific, predictable expense. Christmas arrives every December. The car needs tyres and an inspection eventually. Insurance premiums, the licence fee, the dentist, the boiler, the laptop: all of them were knowable a year in advance. Almost nothing that people call a financial emergency actually qualifies.

The ones that do qualify are the others. A job loss, a serious illness, a death in the family, a burst pipe at midnight. Those are what the emergency fund is for, and mixing them with predictable costs is why so many emergency funds never stay full.

What happens without one

Two versions of the same €1,800 repair, one with a fund and one without:

The interest is the visible cost. The invisible one is the timing: a fund lets you pay the garage on Friday and keep the rest of the month intact, while a loan pushes everything else back for two years.

What a sinking fund is not

It is not a holiday account you raid for a weekend, and it is not your emergency fund with a different label. Three rules separate the two.

• One purpose per account. A pot called "car and gifts and maybe laptop" gets spent on whatever comes first.
• The balance is allowed to fall to zero. Spending it on the thing you saved for is the plan working, not a failure.
• It stays accessible. Cash or an instant-access savings account. Money you need in March does not belong in the stock market, where March might be a bad month.

Setting one up with real numbers

The method is four steps and fits on an index card: list every irregular expense from the last twelve months, add up each category, divide by twelve, and move that amount on payday. Here is what €350 a month covers across the four largest categories of a household with net income of €3,600.

Twelve payments of €350 come to €4,200, which is exactly the annual total. The list is worth checking against the €1,200 Christmas budget too: one twelfth of that is €100 a month, and paying it monthly feels like nothing next to finding €1,200 in December.

Where the money lives

A separate savings account per fund is the cleanest version, and most German banks let you open several sub-accounts inside one online banking login, each with its own name. One account plus a spreadsheet works too, though the money is easier to spend when it all sits together. The old envelope system still works for cash-only households.

Interest is a bonus, not the point. On €350 a month at the 3% that a good Tagesgeld account pays, a year of steady contributions earns roughly €78. That is a rounding error next to the €274 of loan interest you avoided, which is the actual return on this habit. Anything with a lock-up or a market risk is the wrong home for it.

Where it sits in the queue matters as much as where it sits: guaranteed minimum payments first, basic living costs second, then a starter emergency fund, then the fund for the bill you already know is coming. If that list looks backwards — a fund for new tyres before the card is cleared — swap it around. The hierarchy is not decoration; it is the difference between getting ahead and treading water.

Not every expense deserves a fund. Rent, groceries, electricity and subscriptions arrive every month and belong in the monthly budget as ordinary lines. A fund is only for the costs that arrive on their own schedule. The distinction matters because a fund that could be refilled any time you dipped into it is not a fund, it is a feeling.