What is a sinking fund?
A sinking fund is a pot of money you build up on purpose for a cost you can see coming. The car insurance that renews every six months, the holidays in December, the new tires next spring: none of them is a surprise, but each one can feel like an emergency when it lands on a normal month's budget.
Instead, you split the cost into small monthly amounts and set them aside as you go. When the bill arrives, the money is already there. The name comes from business, where companies set aside money over time to repay a bond; in personal finance it simply means saving ahead for a planned expense.
The free savings tracker lists your funds side by side, each with a target, what you have saved and a due date, and shows how much to set aside each month.
Sinking fund vs emergency fund
| Compare |
Sinking fund |
Emergency fund |
| What it is for |
A known cost with a rough date |
Something you did not plan for, like job loss or an urgent repair |
| How you size it |
The cost ÷ the months until it is due |
Often a starter amount, then a few months of essential expenses |
| When you use it |
On schedule, then refill it |
Only in a real emergency |
| Example |
$720 car insurance every six months |
A $400 surprise bill |
You usually need both. The Consumer Financial Protection Bureau's savings plan worksheet asks about each separately: expenses that come one to four times a year, such as auto insurance, back-to-school costs, birthdays and holidays, and unexpected costs like a flat tire or a new appliance. In the Federal Reserve's 2025 survey, 55% of adults had emergency savings to cover three months of expenses.
Sinking fund examples
These are example amounts to show the math, not typical costs. Use your own bills from last year.
| Sinking fund |
When it comes |
Example cost |
Months to save |
Per month |
| Car insurance |
Every 6 months |
$720 |
6 |
$120 |
| Car repairs and tires |
Any time; plan yearly |
$600 |
12 |
$50 |
| Holiday gifts |
December |
$500 |
10 |
$50 |
| Birthdays |
Through the year |
$300 |
12 |
$25 |
| Vacation |
Next summer |
$1,500 |
10 |
$150 |
| Home repairs |
Any time; plan yearly |
$1,200 |
12 |
$100 |
| Vet and pet care |
Checkups, vaccines |
$360 |
12 |
$30 |
| Medical and dental copays |
Through the year |
$480 |
12 |
$40 |
| Back to school |
August |
$300 |
10 |
$30 |
| Annual subscriptions |
Renewal month |
$120 |
12 |
$10 |
| New phone |
In 2 years |
$900 |
24 |
$37.50 |
| Property taxes |
Once or twice a year |
$2,400 |
12 |
$200 |
How to calculate a sinking fund
- Write down the cost. Use last year's bill or a quote. For costs that vary, like car repairs, add up what you spent last year.
- Count the months until you need it. A bill due in March, counted from October, gives you 5 months.
- Subtract what you already have. If $200 is already set aside, you only need to save the rest.
- Divide. Monthly amount = (cost − already saved) ÷ months left. The CFPB's worksheet uses the same math: $1,000 in 10 months is $100 a month.
- Round up and automate. Set a transfer for the day after payday so it happens without a decision.
For a bill you pay every year, the shortcut is yearly cost ÷ 12. If a bill comes every six months, divide the six-month amount by 6. If you are starting late, the monthly amount will be higher; the tracker shows the new number as soon as you enter a due date.
How many sinking funds should you have?
Start with three to five: the biggest bills that have caught you out before. For most households these are insurance premiums, car costs, holidays and gifts, and home or pet care. Add more once the first ones run on autopilot. Too many small funds at once makes the monthly total hard to keep up and easy to give up on.
Add up the monthly amounts before you commit. If the total does not fit, stretch the timeline where you can, lower a target, or pick the funds that would hurt most if they arrived unplanned.
Where to keep sinking funds
The usual choice is a separate savings account at a bank or credit union, apart from your everyday checking. Some banks let you split one savings account into labeled buckets or open several free sub-accounts, which works well for sinking funds. Deposits at FDIC-insured banks are insured up to $250,000 per depositor, per bank, per ownership category, and the money can earn interest while it waits. This guide gives general information, not advice on specific accounts or products.
If you keep all your funds in one account, track each fund's balance on paper or in the savings tracker so you know what belongs to what.
What is cash stuffing?
Cash stuffing is a budgeting method where you withdraw cash on payday and divide it into labeled envelopes or binder pockets: groceries, gas, fun money, and often sinking funds like holidays or car repairs. When an envelope is empty, spending in that category stops until the next payday. It is a modern, social-media version of the envelope system.
Why people like it: you can see and feel the money, overspending is physically hard, and filling envelopes becomes a small weekly ritual. The CFPB's spending tips make a similar suggestion for small purchases: set aside cash at the start of the week and do not spend more than you set aside.
The risks of cash stuffing
The envelope idea is useful; holding large amounts of cash at home is the risky part.
- No insurance. The FDIC notes that cash that is not in a deposit account is not protected by FDIC insurance. If it is lost, stolen or burned, there may be no way to get it back.
- No interest. Money in a home safe or an envelope cannot earn interest, while the same money in a savings account can.
- Hard to use for some bills. Insurance, subscriptions and online purchases usually need a card or a bank transfer.
- Temptation. Cash on hand can be easier to borrow from "just this once".
A middle path many people use: keep weekly spending categories, like groceries and fun money, in cash envelopes, and keep sinking funds in the bank, tracked as separate balances. Some call this cashless cash stuffing. You still get the envelope habit, and the bigger balances stay insured.
How to track your sinking funds
Write each fund on one line with its target, what is in it and when you need it. Update it when you add money, and look at it once a month. The free savings tracker does this on your phone, shows a progress bar for every fund and how much to save each month, and prints on one page. For a fixed goal with weekly boxes to tick, try the 52-week savings challenge, and to free up money for your funds, a no spend challenge or a no buy challenge can help. If money is part of your plans for the year, a money vision board keeps the goal in sight.
