Christmas, car repairs, annual subscriptions, birthdays, the dentist. None of these are really surprises, yet they often land on a budget like an emergency. Sinking funds are one of the simplest ways to stop that from happening.
What are sinking funds?
A sinking fund is money you set aside, a little at a time, for a specific expense you know is coming. Instead of finding a large amount all at once, you spread the cost over several months.
For example: if you expect to spend 600 on gifts in December and start saving in January, you put aside 50 a month. By December, the money is already waiting.
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Sinking fund vs. emergency fund
They are easy to confuse, but they do different jobs:
- A sinking fund is for expenses you can predict: holidays, insurance renewals, school costs, birthdays.
- An emergency fund is for things you can't predict: job loss, an urgent repair, a medical bill.
When predictable costs have their own money, your emergency fund can stay for real emergencies.
Sinking fund ideas
Common sinking fund categories include:
- Christmas and holiday gifts
- Birthdays and celebrations
- Holidays and travel
- Car maintenance, tyres and MOT or inspection
- Annual subscriptions and memberships
- Insurance renewals
- Home repairs and replacing appliances
- Medical, dental and glasses
- Pet costs and vet bills
- Back-to-school costs
- Clothing and seasonal items
You don't need all of these. Start with the two or three that most often catch you off guard. If you're in the US, a medical sinking fund sized around your health plan's deductible is worth considering; our open enrollment checklist for 2027 shows how to work out that number.
How to set up sinking funds
1. List your irregular expenses
Look back over the last twelve months of your bank statements. Note every cost that doesn't happen monthly, and roughly how much it was.
2. Divide by the months you have
For each expense, divide the total by the number of months until you need it. That is your monthly sinking fund amount.
3. Give each fund a home
Many banks let you create separate savings pots or spaces with their own names. Labelling them "Christmas" or "Car" makes the money feel spoken for, which makes it less tempting to spend.
4. Automate it
Schedule transfers on payday so your sinking funds fill up without you having to remember.
5. Spend it without guilt
When the expense arrives, use the money. That's what it was for. Spending a sinking fund isn't failing at saving; it's the plan working.
What if you can't afford all of them?
Start small. Even a modest amount each month makes the next big expense smaller. If the full list feels overwhelming, choose your top one and fund only that until it becomes a habit. Our guide on budgeting when you hate budgeting can help you find the space.
Starting a Christmas sinking fund now
If you're reading this in autumn, a holiday sinking fund still helps. Divide what you plan to spend by the weeks left and put that aside each payday. For a step-by-step plan, see how to save for Christmas starting in October.
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Educational content only. Not personalised financial advice.