What Is a Sinking Fund? (+ 12 Categories You Forget)
A sinking fund is money you set aside a little at a time for a specific, expected expense in the future, so when the bill arrives, it’s already paid for. Instead of being blindsided by Christmas, the car service or the annual insurance renewal, you’ve been quietly saving for it all year.
It’s one of the simplest budgeting ideas there is, and one of the most powerful: sinking funds are how you stop “surprise” expenses from wrecking your month, or pushing you into debt.
Sinking fund vs emergency fund: what’s the difference?
People mix these up, but they do different jobs:
- An emergency fund is for the unexpected: a job loss, a boiler breakdown. One pot, untouched until something genuinely urgent happens.
- A sinking fund is for the expected-but-irregular: things you know are coming but that don’t fall in your monthly budget: the MOT, the family holiday, birthdays, the annual insurance bill.
You want both. The emergency fund is your safety net; sinking funds are your plan for life’s predictable big-ticket moments.
Why sinking funds work
The trick is turning a scary lump sum into a small, painless monthly amount. A £600 Christmas in December feels impossible in one go, but starting in January, that’s just £50 a month. By the time December arrives, it’s handled, and you haven’t touched a credit card.
That’s the whole magic: no surprises, no debt, no January regret.
12 sinking fund categories people forget
Beyond the obvious holiday and Christmas pots, these are the ones that catch people out:
- Car: MOT, service, tyres, repairs
- Annual insurance renewals (car, home, pet, life)
- Christmas & gifts (the big one)
- Birthdays & celebrations
- Holidays & travel
- Home maintenance & repairs
- Medical & dental (check-ups, glasses, excess fees)
- Vet bills & pet care
- Annual subscriptions that renew in one hit (software, memberships, Amazon Prime)
- Back-to-school / kids’ costs
- Tax bills (if you’re self-employed) or other annual dues
- Tech replacement: phone, laptop, white goods that won’t last forever
Most people only budget monthly, and these irregular costs are exactly what blows the budget. A sinking fund for each turns them into a planned, manageable line.
How to set up a sinking fund (3 steps)
- List your goals: pick the expenses above that apply to you, with a target amount and a deadline.
- Work out the monthly amount: divide the target by the months you have. (£400 car service due in 8 months = £50/month.)
- Save it somewhere separate: a named savings pot or sub-account, so it’s not “spent by accident.”
Then top each fund up every payday, and draw from it when the expense lands, guilt-free, because you planned for it.
Track them all in one place
The hardest part is keeping multiple funds straight: what you’ve saved, what’s left, and whether you’re on track for each deadline. Our Sinking Funds Tracker for Google Sheets does that automatically: set each goal and deadline, and it shows your monthly target and progress at a glance. (It’s also one of the tabs in the All-in-One Budget Planner if you’d rather have everything together.)
General information only, not financial advice. For decisions about your circumstances, consider a qualified adviser.
Frequently asked questions
What’s the difference between a sinking fund and savings?+
A sinking fund is savings with a specific purpose and deadline (e.g. £600 for Christmas by December). General savings have no set target or date.
How many sinking funds should I have?+
As many as you have predictable irregular expenses. Most people run 5–12. Start with the few that have hurt you before (car, Christmas, insurance) and add more over time.
Where should I keep the money?+
In a separate, named savings account or pot so it isn’t spent by accident. Many banks let you create sub-accounts or "spaces" for exactly this.
How much should I put in each month?+
Divide each goal by the number of months until you need it. The tracker works this out for you automatically.