Sinking Funds
Not every withdrawal from savings is actually an emergency — car repairs and holiday gifts are expenses you saw coming.
What Is It
A sinking fund is money set aside gradually, usually in a separate account or budget category, for a specific expense you can already see coming — car maintenance, an annual insurance premium, holiday spending, a trip you’ve already planned. The name comes from the same idea behind a company setting aside cash to retire a bond over time, rather than needing to come up with the full amount all at once when it comes due.
Why It Matters
The point is separating “planned but irregular” expenses from true emergencies. Without a sinking fund, a foreseeable cost like an annual premium or a holiday season ends up either raiding an emergency fund that’s supposed to be reserved for real emergencies, or hitting you as an unwelcome surprise even though it was entirely predictable months in advance. Neither outcome is really about bad luck — it's a timing mismatch between when the expense hits and when the money for it was actually set aside.
Sinking funds also pair naturally with zero-based budgeting, since each one becomes its own line item rather than a vague hope that there will be enough left over in December to cover the holidays. Some people keep every sinking fund in one savings account with a running mental tally per goal; others open separate sub-accounts for each one, trading a little more setup for a clearer picture of exactly how funded each goal actually is.
Quick Example
$1,200 a year in car maintenance, $600 in holiday gifts, and $400 in software or subscription renewals adds up to $2,200 a year in these “known unknowns.” Set aside as roughly $183 a month split across separate sinking funds, none of it needs to come out of emergency savings when it eventually comes due — and none of it shows up as a surprise when the bill or the season actually arrives.
Add your own goals and see the combined monthly total:
Try It Yourself
There’s no calculator built specifically for sinking funds yet — the Emergency Fund Calculator is the closest structural fit, since both are goal-based savings targets.
🛡Emergency Fund Calculator
Find your ideal emergency fund size based on income, expenses, and risk tolerance.