Sinking funds: how to save for the bills you can see coming
Co-founder of Penge · Published 17 July 2026 · 6 min read
Some bills only arrive once or twice a year, and they always seem to land at the worst time. Sinking funds turn those big, lumpy costs into a small, calm amount you set aside every month.
Key takeaways
- A sinking fund is money you set aside a little at a time for a known but irregular expense, so the bill is already paid for when it arrives.
- It is different from an emergency fund: a sinking fund is for costs you can see coming, an emergency fund is for the ones you cannot.
- Typical sinking funds cover car service, Christmas, annual insurance, holidays, birthdays and replacing things that wear out.
- Set one up in four steps: list your irregular costs, estimate each yearly total, divide by twelve, and transfer that amount every month.
- You can keep every fund in one account and track them separately, or open a dedicated account for each goal.
What is a sinking fund?
A sinking fund is money you build up gradually for a specific expense you know is coming but that does not fall every month, such as a car service or Christmas. Instead of being hit by the full bill at once, you set aside a small amount each month so the money is ready when the cost arrives.
The word sounds technical, but the idea is simple and old. You are spreading a large, occasional cost across the whole year so it never lands as a shock. When the bill comes, the money is already there, sitting in its own pot, and you pay it without touching your everyday budget or reaching for a credit card.
How a sinking fund is different from an emergency fund
The two are easy to mix up, but they solve different problems. An emergency fund is for the unexpected: a job loss, a sudden illness, a repair you had no way to predict. A sinking fund is for the expected but irregular: costs you know are coming, even if not every month. You save toward a sinking fund with a clear target and date in mind, while an emergency fund simply sits there as a safety net you hope never to need. Most people benefit from having both.
What to save for with sinking funds
Anything that comes around predictably but not monthly is a candidate. Common examples include:
- Car costs: service, tyres, the annual inspection and repairs.
- Christmas and birthdays: presents, food and travel to see family.
- Insurance and subscriptions billed once a year rather than monthly.
- Holidays and trips you know you will take.
- Replacing things that wear out: a phone, a laptop, a washing machine, glasses.
- Home and pet costs: maintenance, vet visits and check-ups.
How to set up a sinking fund in four steps
- List your irregular costs. Go through the last year and note everything that came once or twice rather than every month.
- Estimate a yearly total for each one. A rough, slightly cautious figure is fine; you can adjust it later.
- Divide each total by twelve. That is the amount to set aside every month for that goal.
- Set up the transfer. Move the money on payday, before you have a chance to spend it, and let each pot fill up on its own.
| Expense | Example cost per year | Set aside per month |
|---|---|---|
| Car service and repairs | 6,000 | 500 |
| Christmas and gifts | 4,800 | 400 |
| Annual insurance | 3,600 | 300 |
| Summer holiday | 12,000 | 1,000 |
| Total | 26,400 | 2,200 |
One account or several?
There are two common ways to hold the money. The simplest is to keep everything in one savings account and track each fund on paper or in an app, so you always know how much of the balance belongs to which goal. The other is to open a separate account for each larger goal, which makes the balances impossible to confuse but means juggling more accounts. Either works. The important part is that the money is kept apart from your everyday spending so you are not tempted to dip into it.
How Penge helps
Sinking funds only work when you know which irregular costs are actually coming, and that is the part Penge takes care of. Penge connects to more than 2500 banks in over 30 countries, gathers your accounts in one overview and categorizes your spending automatically when it is sure. That makes last year's one-off costs easy to spot, so you can size each fund realistically. You set a budget per category and see during the month whether you are on track. The connection is read-only, and your bank credentials are never stored.
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Connect your bank and let the app categorize and budget automatically.
Frequently asked questions
- What is the difference between a sinking fund and an emergency fund?
- A sinking fund is for expected but irregular costs you can plan for, such as a car service or Christmas. An emergency fund is for genuinely unexpected events, such as a job loss or a sudden repair. Many people keep both, since they cover different kinds of surprise.
- How many sinking funds should I have?
- As many as you have irregular costs, but start small. It is better to begin with two or three of your biggest lumpy expenses and add more once the habit sticks, than to set up ten pots and give up.
- Where should I keep my sinking funds?
- In a savings account kept separate from your everyday account, so you are not tempted to spend the money. You can hold several funds in one account and track them individually, or open a dedicated account for each larger goal.