Sinking Fund

A sinking fund is money set aside a little each month for a large expense you know is coming. Travel, replacing a car, annual insurance premiums and vehicle taxes, holiday spending: anything where you roughly know both the timing and the amount.

The core idea is dividing a big expense by twelve. Planning a $2,400 trip a year from now means saving $200 a month. The trip stops being a sudden lump sum and becomes a regular monthly line item, and when you actually travel the money is already there, so there is no reason to put it on a card.

It differs from an emergency fund. An emergency fund covers the unexpected, like job loss or medical bills, and the goal is not to touch it. A sinking fund has a known spending date and exists to be spent. Mixing them in one account means raiding your emergency savings for a vacation, so keep separate accounts or sub-accounts by purpose.

The reason it works so well in practice is that most sudden expenses are not actually sudden. Car insurance falls in the same month every year and holidays are on the calendar. Simply pre-slicing the predictable costs sharply reduces how often you reach for installment plans or an overdraft.