What Are Sinking Funds? A Simple Guide
Some expenses are too large for one month's budget but predictable enough to plan for. A sinking fund helps you prepare by setting aside money gradually before you need to spend it.
A sinking fund is money saved for a known future expense.
A sinking fund is a pool of money you build gradually for a particular expense you expect to pay for in the future. Instead of finding the full amount when the bill arrives, you spread the saving across the time available.
For example, if you expect to spend €360 on a planned expense in twelve months, you could aim to set aside €30 per month. By the time the expense arrives, you would have saved the target amount if you make all the contributions and do not withdraw money from the fund.
The name may sound complicated, but the method is simple: know what you are saving for, estimate the cost, work out how much time you have, and set aside what you can afford.
Examples of sinking funds.
Sinking funds are useful for costs that are expected or planned, even when the exact final amount may change.
Flights, accommodation and planned activities.
Payments that come once or a few times per year.
Expected servicing, registration or routine maintenance.
Birthdays, celebrations and seasonal occasions.
A planned replacement for a phone or laptop.
Planned furniture, appliances or small improvements.
You do not need a separate fund for every purchase. Start with the expenses that are most important, expensive, or easy to forget when planning your monthly budget.
How is a sinking fund different from an emergency fund?
The main difference is what the money is intended to cover. A sinking fund prepares you for a known or planned expense. An emergency fund provides a financial buffer for important unexpected situations.
Saving for a holiday you plan to take next summer.
Money available if an unexpected essential expense arises.
These funds serve different purposes, so it can be useful to track them separately. If you use emergency savings for a planned purchase, you may have less money available when an unexpected problem occurs.
Read our related guide: How to Build an Emergency Fund.
How much should you save each month?
A simple starting point is to subtract any money you have already saved for the expense from the target cost, then divide the remaining amount by the number of months left.
Monthly contribution = (Target cost − Amount already saved) ÷ Months remaining
Imagine you want to set aside €600 for a trip in eight months. You have already saved €120. That leaves €480 to save. Dividing €480 by eight means you would need to contribute €60 per month to reach the target, assuming the cost does not change.
If €60 per month is not affordable, you have a few choices: reduce the planned cost, extend the timeline, contribute different amounts when possible, or choose a smaller goal. It is better to adjust the plan than to rely on money you need for essential expenses.
These calculations do not include interest, fees, inflation, or unexpected price changes. Review your target if the expected cost changes.
Can you have more than one sinking fund?
Yes. You can track separate funds for different expenses if doing so makes your money easier to organize. For example, you might have one fund for a holiday and another for an annual insurance payment.
However, separate labels do not automatically mean that the money is physically held in separate bank accounts. You can track different goals in a budgeting tool while keeping the money in one account, provided you keep a clear record of how much is intended for each purpose.
Be careful not to count the same money toward multiple goals. If you have €300 available and assign all €300 to your travel fund, that same €300 cannot also fully fund another goal.
Your total savings and the amounts assigned to individual goals should agree. This helps prevent you from planning to spend the same money twice.
Where should you keep sinking fund money?
The appropriate place depends on when you need the money, how much access you require, and the terms of the account you choose. For a near-term expense, ease of access and keeping the money separate in your records may be more important than pursuing a higher return.
If you use a savings account, check its fees, withdrawal conditions, interest rules, and any other relevant terms. Do not assume that every account provides immediate access or that its balance is protected in exactly the same way.
A sinking fund is a budgeting method, not a specific type of bank account. You can use the method without opening a new account for every goal.
Common sinking fund mistakes to avoid.
Underestimating the total cost. Include the expenses you expect to pay, not just the most obvious purchase. A trip may involve transport, lodging, food, and other costs.
Starting too late. If a deadline is close, the required monthly contribution may be much higher. Adjust the target or timeline if possible rather than assuming the original plan will work.
Forgetting to update the target. Prices and plans can change. Review your estimate when you receive new information about the expense.
Using the fund for something else. If you spend money assigned to one goal on another purchase, update the balance and timeline. Otherwise, your tracker may show progress that no longer reflects reality.
Creating too many funds at once. Tracking every small expense separately can become overwhelming. Start with a few meaningful priorities and add more only when the method is helpful.
Set up your first sinking fund.
Choose one expense you expect to pay for in the future.
Estimate the total cost and when you will need the money.
Subtract any money you have already saved for that purpose.
Divide the remaining amount by the months available.
Check whether the contribution fits your budget and adjust if needed.
Update the balance when you add money or pay for the expense.
Make future expenses easier to plan for.
A sinking fund prepares for a known or planned expense.
You build it gradually instead of finding the full amount at once.
The monthly target depends on the cost, existing savings, and time available.
Sinking funds and emergency funds serve different purposes.
Start with a few important goals and keep the records accurate.
Plan your next expense one step at a time.
Use RealSavings Tracker to create a goal, set a target, record contributions, and follow your progress toward the things you are planning for.
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