Some of the biggest budget shocks are not really surprises. The car needs new tires every few years. The annual insurance bill arrives every year. Holiday gifts happen every December. A sinking fund turns those predictable costs into small, regular savings, so the bill is no longer a shock.
What a sinking fund is
A sinking fund is a pot of money you build up gradually for a specific, known expense. It is different from an emergency fund. An emergency fund covers the unexpected. A sinking fund covers things you can see coming, even if you do not know the exact date or amount.
Why it works
Imagine a $600 car repair bill. If you pay it all at once from your checking account, it can wipe out the month. If you had set aside $50 a month for a year, you would simply pay it from the fund, and nothing else in your budget would change.
The idea is to spread a large cost over many months so no single month carries the weight.
Ideas for sinking funds
You do not need all of these. Pick the ones that match your life:
- Car repairs and maintenance
- Annual or semiannual bills, such as insurance or subscriptions
- Holidays and gifts
- Medical costs and prescriptions
- A planned trip
- Replacing a phone, laptop or appliance
- Back to school costs
How to start one in four steps
- List the expenses you know are coming. Look through the last year of spending and note anything that came up once or twice.
- Estimate each cost. A rough number is fine. Round up if you are unsure.
- Divide by the months you have. If you expect a $600 cost in twelve months, that is $50 a month. For a $240 cost in six months, it is $40 a month.
- Move the money automatically. Set a transfer on payday so it happens before you can spend it.
Where to keep the money
Keep sinking fund money separate from your everyday spending so it does not get used by accident. A savings account works well. Some people use one account with several labelled goals. Others use a separate account for each fund. Choose the setup you will actually keep up with.
Common mistakes
- Starting too many funds at once. Begin with two or three and add more later.
- Raiding the fund for something else. If you must, pay it back the next month.
- Forgetting to update the amount. If a cost goes up, raise the monthly contribution.
- Not tracking progress. Seeing a fund fill up keeps you going.
What to do when the bill arrives
When the expense comes, pay it from the fund and reset the goal for the next cycle. If you saved more than you needed, move the extra to another goal or to your emergency fund.
Cashflow: Budget Manager has savings goals, where you set a target and track progress, which suits this approach. You can also use a spreadsheet or a notebook. The habit matters more than the tool.
General information, not financial, tax or legal advice. Your situation is different, so talk to a qualified professional before big decisions.
Related: Savings goals
Track it in Cashflow
Cashflow: Budget Manager is a free app to scan receipts, set budgets and savings goals, and see where your money goes.