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Sinking Funds: Stop Once-a-Year Expenses From Breaking Your Budget

By Smart Budget Sheets November 10, 2026
List last year's non-monthly costs, give each a yearly number, divide by months until due, keep the money separate, spend without guilt.

Most budgets don’t fail on the monthly bills. They fail on the expenses that show up once or twice a year: the car repair, the insurance renewal, the holiday gifts, the vet. Sinking funds turn those surprises into a small, boring monthly line.

1. List last year’s “surprises”

Go through 12 months of bank and card statements and write down every expense that wasn’t monthly: annual subscriptions, car registration, tyres, dentist, birthdays, school trips, home repairs.

2. Give each one a yearly number

Use what you actually paid, then round up a little. If a cost is unpredictable (car repairs), use an average of the last two or three years.

3. Divide by the months until it’s due

An expense due in 12 months: divide by 12. One due in 4 months: divide by 4. Example: $600 insurance due in 6 months is $100 a month; $900 of gifts due in 12 months is $75 a month.

4. Keep the money separate

One savings account with labelled sub-balances (or a simple spreadsheet tracking each fund) works. The point is that the money for the car isn’t quietly spent on groceries.

5. Spend from the fund without guilt

When the bill comes, pay it from the fund. That’s the whole point. Then reset the monthly amount for next year.

Sinking funds vs. an emergency fund

An emergency fund covers things you can’t predict (job loss, a big medical bill). Sinking funds cover things you know are coming, just not monthly. Keeping them apart stops the emergency fund being drained by Christmas.

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General information, not personal financial advice.

#personalfinance #budgeting #savings
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