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Sinking funds: the budgeting habit that stops surprise bills

Insurance, car registration, holidays and the annual dentist bill are not emergencies. They are predictable — and they can be pre-funded monthly.

By Sankha NagChoudhurySeptember 14, 20266 min read

Most budgets fail in the months with a large irregular bill. Sinking funds fix that by turning a once-a-year cost into a small monthly line you have already paid.

List the costs you already know are coming

Look back over twelve months of statements and write down everything that was not a monthly bill. That list is almost identical to next year's list.

  • Insurance premiums, car registration, tyres and servicing.
  • Holidays, birthdays, school costs, annual subscriptions.
  • Medical and dental visits, pet care, home maintenance.

Divide each one by twelve

A $960 annual premium is an $80 monthly line. The bill stops being an event and becomes a transfer.

  • Round up — being slightly overfunded costs nothing.
  • For a cost due in four months, divide by four, not twelve.
  • Total the monthly lines; if the total is unaffordable, the problem is the plan, not the month the bill lands.

Keep them visible and separate

The money needs a name. Whether that is several savings sub-accounts or one account with a tracking sheet, each dollar should be labelled.

  • Many banks allow multiple named savings buckets at no cost.
  • Keep sinking funds separate from the emergency fund so neither hides the other.
  • Review once a quarter and adjust for price rises.

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