Key takeaways
- A sinking fund is money you set aside each month for a known future expense.
- It’s different from an emergency fund, which is for surprises.
- Divide the expected cost by the number of months until it’s due.
- Common examples: car registration, insurance premiums, holidays, school costs and car maintenance.
- Sinking funds help keep predictable expenses off your credit cards.
Some of the bills that do the most damage to a budget aren’t surprises at all. Car registration, a six-month insurance premium, back-to-school costs and holiday gifts come around every year. But because they don’t come monthly, they’re easy to forget until they land, and then they go on a credit card. A sinking fund fixes that.
What a sinking fund is
A sinking fund is money you set aside a little at a time for a specific, expected expense. When the bill comes, the money is already there.
Sinking fund vs. emergency fund
| Sinking fund | Emergency fund | |
|---|---|---|
| For | Expenses you know are coming | Unexpected expenses |
| Examples | Car registration, holidays, annual fees | Job loss, urgent car repair, medical bill |
| Amount | Based on the expected cost | Based on your situation and essential expenses |
Both matter. Without sinking funds, predictable bills drain your emergency fund. See how to build an emergency fund while you’re in debt.
How to set one up
- List expenses that don’t come monthly. Go through last year’s bank and card statements for clues.
- Estimate each cost and when it’s due.
- Divide by the number of months until it’s due. That’s your monthly amount.
- Save that amount each month, ideally by automatic transfer.
- Spend it only on that expense. When the bill comes, pay it from the fund.
An example
These numbers are only for illustration:
| Expense | Cost | Months away | Save each month |
|---|---|---|---|
| Car registration | $180 | 6 | $30 |
| Car insurance (6-month premium) | $540 | 6 | $90 |
| Holiday gifts | $300 | 10 | $30 |
| Back-to-school costs | $200 | 8 | $25 |
| Total | $175 |
That $175 a month is much easier to plan for than a $540 insurance bill appearing out of nowhere.
Common sinking fund categories
- Car: registration, insurance premiums, maintenance, tires.
- Home: renter’s or homeowner’s insurance, property taxes, repairs.
- Health: deductibles, glasses, dental work.
- Family: school costs, birthdays, holidays, child care gaps.
- Annual fees and subscriptions.
- Gifts and travel.
Where to keep sinking funds
You can use one separate savings account and track each fund in a simple list, or use a bank that lets you create multiple savings “buckets.” Keep the money separate from everyday spending so it doesn’t get used by accident.
When money is tight
If you can’t fund everything, start with the expense that would hurt most to miss, like car insurance or registration if you need your car for work. Even partial savings reduce how much ends up on a credit card. Our bare-bones budget guide helps you set priorities.
Fitting sinking funds into your budget
Sinking funds work well inside a zero-based budget or as part of the savings share in a 50/30/20 budget. If your income varies, see how to budget on an irregular income.
The bottom line
A sinking fund turns big, predictable bills into small monthly amounts. List what’s coming, divide by the months until it’s due, and save a little each month. It’s one of the simplest ways to keep new charges off your credit cards.
Sources: CFPB: budgeting, how to create a budget and stick with it · CFPB: an essential guide to building an emergency fund