Sinking Funds: The Saving Trick Nobody Explains Well

Let me describe a situation you'll recognise. The car needs new tyres, and it feels like a financial emergency. But tyres wear out on a predictable schedule. You knew. You just hadn't set anything aside.

That's the gap a sinking fund fills. You take an expense you know is coming but that doesn't arrive monthly, divide it by the number of months until it lands, and save that amount each month. When the bill arrives, the money's already there.

The term comes from corporate finance, which is probably why it sounds more complicated than it is.

Why it matters more than it sounds

Here's the argument I'd make for it. Most people's emergency fund gets drained by things that weren't emergencies — an annual insurance renewal, Christmas, a wedding they'd known about for eight months. Then a real emergency arrives and the fund isn't there.

Sinking funds keep those two things separate. Fidelity's framing of the emergency fund is money for genuinely unanticipated events — a surprise medical bill or a layoff. Predictable expenses don't qualify, and giving them their own home is what lets the emergency fund do its actual job.

Setting them up

List the irregular expenses you can genuinely anticipate over the next twelve months. Insurance renewals, car servicing and tyres, professional subscriptions, gifts and holidays, school costs, travel, anticipated home maintenance.

Total them, divide by twelve, and that's your monthly sinking fund contribution. The number is usually larger than people expect, which is precisely the point — that amount has been hitting you anyway, just unpredictably.

You don't need a separate account per category. One account with a spreadsheet tracking the notional split works fine, though some banks offer pots or sub-accounts that make it visual.

A few practical points

Start with the two or three expenses that have caused the most disruption. A complete system built on day one tends not to survive.

Round estimates upward. Being over is a pleasant problem.

And revisit annually, since costs change and so do circumstances.

The list-building is the hard part, because irregular expenses are by definition the ones you forget. Twelve months of statements is the reliable way to find them — StatementOrganizer.com will surface annual and quarterly charges you'd otherwise miss.

References

• Emergency fund: What it is and why you should have one — Fidelity
• Budgeting: How to create a budget and stick with it — Consumer Financial Protection Bureau
• Saving Automatically — America Saves

This article is for general information only and is not financial advice. Consider your own circumstances or speak to a qualified professional.