Plan for the predictable
Sinking funds: make the predictable bills less surprising
A simple way to turn an annual bill or a known future cost into a regular amount you can plan around.
The useful answer
A sinking fund is money set aside for a cost you expect, such as an annual bill, a holiday or a replacement purchase. Subtract what is already saved from the target, then divide the gap by the number of paydays before it is due.
What to know
- Known costs and unexpected emergencies need different jobs in the plan.
- The due date determines how quickly you need to build the pot.
- Set a contribution that fits your available money and revisit the target when costs change.
Name the future cost.
“Savings” can mean several things. A sinking fund is more specific: money for a known job. Naming the cost and its due date makes it easier to see whether the pot is on track and whether using it for something else would create a problem.
MoneyHelper’s sinking-fund guide distinguishes planned costs from emergency savings. A bill you receive every year is foreseeable, even if it has surprised you in the past.
Work from the gap and the deadline.
Write down the expected cost, the amount already set aside and the number of contributions you can make before payment is due. Subtract the saved amount, then divide the gap by those contributions. If the next payday falls after the bill date, it cannot fund that bill.
Use an estimate if the future price is unknown and mark it as one. Recheck when a renewal notice or quote arrives.
Use as many pots as you can maintain.
You do not need a separate account for every item. A bank pot, a spreadsheet line or another clear record can help distinguish the jobs. The important part is knowing what the total represents and when each amount is needed.
Too many tiny categories can make the system harder to maintain. You might begin with a few larger groups, such as annual bills, planned travel and household replacements, then separate a cost when its timing needs special attention.
If the required contribution does not fit.
A calculation can reveal a gap without solving it. Consider whether the cost can be reduced, the deadline changed or another planned expense adjusted. Keep essential commitments and required payments in view before moving money around.
For a discretionary goal, a later date may be sensible. For a necessary bill you cannot cover, seek appropriate help rather than assuming a savings pot will make the shortfall disappear.
Fold it into your normal money check.
Check the pot when income arrives and review it when a price or date changes. Once a recurring annual bill is paid, set the next target while the amount is fresh.
Include sinking-fund contributions in your monthly budget so money reserved for a future bill does not appear to be spare spending money. Our budget calculator has a field for savings and annual-cost pots.
Sources & further reading
Examples are illustrative unless stated otherwise.
- MoneyHelper: sinking funds explained · Checked 7 September 2026
- MoneyHelper: managing your money using savings pots · Checked 7 September 2026
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