by Youssef El Beqqal · August 9, 2026
Sinking Funds: How to Save for Expenses You Know Are Coming
TL;DR
Sinking funds set aside a little money monthly for expenses that are predictable but not monthly - car registration, holiday gifts, annual premiums - so the bill never has to come out of a single month's budget all at once.
Some expenses aren't surprises at all - you know your car registration is due every year, you know the holidays are coming. And yet they still show up like emergencies, because nothing was set aside for them ahead of time.
The gap a monthly budget doesn't cover
A monthly budget is built around monthly expenses. Anything that happens once or twice a year - registration, an annual subscription, holiday spending, a birthday season - doesn't have a natural home in that structure, so it either gets forgotten or blows up whatever month it lands in. A sinking fund fixes that: a target amount, saved a little at a time, earmarked for a specific future expense. If registration is $300 once a year, that's $25 a month set aside specifically for it, so when the bill arrives, the money's already there instead of coming out of that month's regular budget. This is exactly the approach that works for annual bills like insurance and property tax too.
Why this beats "I'll just remember to save for it"
Vague intentions to save don't survive contact with a normal month. A named target with a running balance does, because you can see it building and know exactly what it's for - it stops competing with everything else for the same dollars.
MoneyFlow's savings goals work exactly this way: name the expense, set the target and date, and watch the fund build automatically instead of hoping you remember in time.
