A sinking fund is money set aside in small amounts for a known future expense, so a large bill does not wreck your budget.
How they work
Estimate the annual cost, divide by 12 and automate that amount monthly into a labeled account. A $1,800 annual car insurance premium becomes $150 per month. A $600 holiday budget becomes $50.
Common categories
Car maintenance, annual insurance premiums, holiday gifts, vacations, medical deductibles, property tax, home repairs and replacing electronics.
Sinking funds vs emergency funds
Emergency funds cover surprises. Sinking funds cover predictable but irregular costs. Keeping them separate prevents raiding your safety net for planned expenses. Many online banks allow multiple savings buckets or sub-accounts.
Try the numbers
Use our Savings Goal Calculator to see this in practice. With its default example (Savings goal: $50,000; Already saved: $5,000; Years to goal: 5), it shows monthly savings needed: $657. Adjust the inputs to match your situation.
Key takeaways
- Divide the annual cost by 12 and save monthly.
- Label accounts by purpose.
- Keep sinking and emergency funds separate.
This article is for general education and is not personalized financial, tax or legal advice. Rules and limits change; confirm current figures with official sources such as IRS.gov, SSA.gov and StudentAid.gov, or consult a qualified professional. © 2026 FinanzCalc.