Why "unexpected" bills are not unexpected
Most budget-busting bills are not true emergencies. Birthdays and holidays come every year, cars need tires and servicing, and insurance renews on a known date. They feel like surprises only because they do not arrive every month. A sinking fund turns each of them into a small monthly amount, so when the bill arrives the money is already waiting.
Add up what you spent on each category last year, or a fair estimate, and divide by twelve. In the example, $5,500 of yearly costs becomes about $458 a month. Many people keep these in separate labelled savings buckets that most online banks now offer.
Sinking fund vs emergency fund
An emergency fund covers the genuinely unpredictable, like losing a job or a large medical bill. A sinking fund covers predictable but irregular costs. Keeping them apart protects the emergency fund from being drained by the holidays, and it makes your regular monthly budget far more honest.
Common questions
What is a sinking fund?
Money set aside each month for a known future expense, so it is fully saved when the bill arrives.
What should I have sinking funds for?
Common ones: gifts and holidays, car maintenance, insurance premiums, medical costs, home repairs, travel and annual subscriptions.
Where should I keep sinking funds?
A high-yield savings account with sub-accounts or "buckets" works well.
This calculator gives estimates for planning. Real returns, rates and prices change, so treat the result as a guide rather than a promise. Read how we build and check our calculators.