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Sinking Fund Calculator for Planned Expenses

Plan for car repairs, holidays, gifts and yearly bills: see how much to put aside every month for each goal so the money is ready when the bill comes.

By TanLabs Editorial Team · Reviewed: page results cross-checked against the free spreadsheet · Last updated · Runs in your browser – nothing you type is sent anywhere

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How to use this calculator

  1. List up to four planned expenses that do not come every month – car insurance, holidays, repairs, a vacation.
  2. Enter the amount for each and how many months remain until it is due.
  3. Read the total to set aside each month, each week and per biweekly paycheck.
  4. Set up an automatic transfer for that amount on payday into a separate savings account or bucket.

Worked example

With goal 1 amount: e.g. car insurance $1,200, goal 1 – months until due 12, goal 2 amount: e.g. holidays & gifts $1,000, goal 2 – months until due 10, goal 3 amount: e.g. car repairs $800, goal 3 – months until due 12, goal 4 amount: e.g. vacation $2,000, goal 4 – months until due 8:

Set aside $516.67 a month in total
About $119.23 a week or $238.46 per biweekly paycheck · 4 goals worth $5,000.00

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How it's calculated

Monthly amount for each goal = goal amount ÷ months until it is due. Total monthly = the sum over all goals. Weekly = monthly × 12 ÷ 52; per biweekly paycheck = monthly × 12 ÷ 26.

Formula source: Monthly amount = goal ÷ months until due, summed over goals – straight-line saving as in CFPB budgeting guidance. CFPB – budgeting: how to create a budget and stick with it
Written and checked by the TanLabs Editorial Team · Last updated

Monthly amounts for common sinking funds

Goals and months until each is due:

GoalAmountMonthsPer monthPer biweekly paycheck
Car insurance paid yearly$1,20012$100.00$46.15
Christmas and gifts (from January)$1,00011$90.91$41.96
Car repairs and tyres$80012$66.67$30.77
Summer vacation$2,0006$333.33$153.85
New laptop$1,20010$120.00$55.38
Vet and pet costs$60012$50.00$23.08
All six goals$760.91$351.19

Six common goals need about $761 a month, or $351 per biweekly paycheck. A short deadline – the 6-month vacation – costs the most per month.

Common mistakes

FAQ

What is a sinking fund?

Money you set aside in small amounts for a known future expense, so the bill does not land on a credit card. It is different from an emergency fund, which is for the unexpected.

One account or several?

Either works. Many banks let you open free savings "buckets" inside one account so each goal has its own balance.

What should I make sinking funds for?

Anything predictable but not monthly: insurance paid yearly, car registration, holidays and Christmas, birthdays, school costs, vet visits and home or car repairs.

How is a sinking fund different from an emergency fund?

An emergency fund covers surprises like job loss. A sinking fund covers costs you know are coming, like yearly insurance or Christmas.

How many sinking funds should I have?

As many as you have irregular bills you can name. Start with the two or three largest.

Can I earn interest on sinking funds?

Yes. A high-yield savings account with separate buckets keeps the money safe, FDIC-insured and earning interest.

Sources: CFPB – budgeting: how to create a budget and stick with it

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