A sinking fund is money you set aside a little at a time for a specific expense you know is coming. That's it. It's the opposite of being ambushed by a bill — you fund it gradually so that when it arrives, the money is already there.
Why big expenses feel like emergencies
An $1,200 insurance premium isn't an emergency. You knew about it a year in advance. It only feels like one because you didn't set anything aside. A sinking fund converts that $1,200 shock into a calm $100 a month — the same total, spread so it never disrupts a single month.
What to fund
Anything predictable but irregular is a candidate:
- Annual subscriptions and insurance
- Holidays and travel
- Car maintenance and registration
- Gifts and the December spending spike
- Replacing a laptop or phone you know is wearing out
How the math works
Take the total cost, divide by the number of months until it's due, and contribute that amount each month. A $600 trip in six months is $100 a month. In Dzing, a goal with a deadline does this automatically: it calculates the monthly contribution and reserves it as part of your Safe to Spend, so the money is quietly protected before you can spend it elsewhere.
The real benefit isn't money — it's calm
The point of a sinking fund isn't a higher net worth. It's the removal of financial surprise. When every big expense has been shrunk into a small monthly line you've already accounted for, the year stops having landmines in it.
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