Car repairs, holidays and annual bills aren’t really surprises. Sinking funds turn them into small monthly amounts.
Key takeaways
- A sinking fund is money set aside regularly for a specific, expected expense.
- Divide the expected cost by the number of months until it’s due to find your monthly amount.
- Common sinking funds cover car maintenance, holidays, insurance premiums and annual subscriptions.
- Keep sinking funds separate from your emergency fund so each does its own job.
Some expenses arrive like clockwork, just not every month: car registration, holiday gifts, annual memberships. When several land at once, they can derail a budget. A sinking fund solves that by saving a little each month for each known cost.
How a sinking fund works
- Choose an expense you know is coming.
- Estimate what it will cost.
- Count the months until it’s due.
- Divide the cost by the number of months, and save that amount each month.
For example, a cost you expect in 10 months needs one-tenth of the total each month. If you start late, the monthly amount rises, so it pays to begin early.
Common sinking funds
| Expense | Why it helps |
|---|---|
| Car maintenance and registration | Repairs and fees arrive irregularly |
| Holidays and gifts | Spreads seasonal spending across the year |
| Insurance premiums | Avoids a large annual or semiannual bill |
| Home repairs | Covers upkeep that isn’t an emergency |
| Annual subscriptions and fees | Keeps renewals from catching you off guard |
| Travel | Lets you book trips without borrowing |
A simple way to set them up
- Make a list of every irregular cost you expect in the next 12 months, with its due month.
- Estimate each cost, using last year’s bills or receipts as a guide.
- Divide each cost by the months remaining until it’s due.
- Add the monthly amounts together, and treat the total as one line in your budget.
Reviewing the list each January, or whenever your plans change, keeps the amounts realistic.
Where to keep them
- A savings account with sub-accounts or buckets for each goal.
- A single savings account, tracked with a simple spreadsheet.
- Always separate from your emergency fund, so planned spending doesn’t eat into your safety net.
Money tip
Automate each sinking fund with a small transfer on payday. Our guide to automating your savings explains how.
Tips for success
- Start with your two or three largest irregular costs.
- Review the amounts once a year as prices change.
- If a fund ends up with money left over, roll it into next year’s fund or another goal.
Worth noting
If an expense is several years away, such as replacing a car, you might compare a savings account with a certificate of deposit for part of the money.
The bottom line
Sinking funds turn predictable big costs into manageable monthly amounts, keep your budget steady and protect your emergency fund. Add them to your budget as regular line items, and they’ll stop feeling like surprises.
Common questions
What’s the difference between a sinking fund and an emergency fund?
A sinking fund is for expected costs you can plan for, like annual insurance. An emergency fund is for unexpected costs like job loss or urgent repairs.
How many sinking funds should I have?
Start with a few that cover your biggest irregular expenses. You can add more as you get comfortable.
Where should I keep sinking funds?
Many people use a savings account with separate sub-accounts or labels, so each fund’s balance is clear.
This article is for general information and education only and isn’t personal financial, tax or legal advice. Rates, fees and rules change, so check current details with the provider or an official source before making decisions.