Sinking Fund
Saving a little each pay toward a known future expense — rego, Christmas, insurance — so it never arrives as a surprise.
A sinking fund is the opposite of an emergency fund: it is for expenses you can see coming. Car registration, annual insurance premiums, Christmas, a wedding you’ve RSVP’d to — divide the cost by the number of pays before it lands, and set that much aside each time.
The effect is that "expensive months" stop existing. December costs the same as March because you paid for December all year.
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