Learn/Budgeting
BudgetingIntermediate5 min read

Sinking funds: budgeting for lumpy expenses

Why smart budgeters save for Christmas in March — and how to set up the buckets.

Most budgets blow up on lumpy expenses — car repairs, Christmas, annual insurance premiums, vet bills, a wedding you're in. These are predictable in cost and unpredictable in timing, and if you treat them as surprises they will destroy your month.

A sinking fund is a tiny savings bucket you contribute to every month so the lumpy expense isn't lumpy when it arrives. It's just… there.

How to set them up

  1. List every expense you pay less often than monthly. Insurance premiums, car maintenance, gifts, travel, taxes if you're self-employed, pet bills, home repairs.
  2. Estimate the annual cost of each. Round up.
  3. Divide by 12. That's your monthly contribution.
  4. Automate that contribution into a savings bucket. Name it after the purpose.
The math is freeing
Christmas: expect to spend $1,200. Set aside $100/month starting in January. In December, you already have the money. No credit card debt, no January hangover. Repeat for 5 other lumpy categories and you've removed most budgeting anxiety.

Sinking funds vs. emergency fund

These are different. An emergency fund is for things you could not have predicted — a layoff, a burst pipe, a medical crisis. Sinking funds are for things you could predict but happen on their own schedule. Keeping them separate mentally (and ideally in different sub-accounts) is the point.

Put this into practice

Worth tracks your accounts, budgets, and goals — so the concepts in this article aren't just theory.

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