Short answer
To set up sinking funds, list every non-monthly bill from the last 12 months, give each a price and due month, and divide it by the months left. Automate one payday transfer to a savings account and track each fund as a separate line or goal. Start with the three to five biggest costs.
How to set up sinking funds in five steps
A sinking fund is money set aside each month for one known future cost. Setting them up takes one evening with your statements and a single automatic transfer.
- List every non-monthly cost from the last 12 months. Go through bank and card statements. Memory misses things like the dentist and the car registration; statements catch them.
- Give each one a price and a due month. Use last year’s amount and add a margin for price increases.
- Divide by the months left. $900 of car insurance due in 9 months is $100 a month. Total the monthly amounts across all funds.
- Automate one transfer on payday to a savings account kept for sinking funds. Track each fund as a line in a spreadsheet or a goal in an app.
- Pay the bill from the fund and restart. The next cycle starts at zero with this year’s actual price.
Sinking fund categories list
Pick the ones that appear in your statements. Sizing from your own history beats any generic amount.
| Sinking fund | Typical timing | How to size it |
|---|---|---|
| Car insurance | Yearly or twice a year | Last renewal notice + a margin for increases |
| Car service and tires | Once or twice a year | Total of last year’s garage receipts |
| Vehicle registration | Yearly | Last year’s fee |
| Holidays and gifts | December, birthdays | Gift list with a number next to each name |
| Home maintenance | Irregular | A fixed monthly amount you top up after each repair |
| Property tax | Instalments or yearly | Last bill from your municipality |
| Annual subscriptions | Renewal dates | Repeating charges in your card history |
| Back-to-school, kids’ activities | August–September | Last year’s receipts |
| Travel | Your trip date | Trip budget / months to departure |
| Medical, dental, glasses | Irregular | Last year’s out-of-pocket total |
How many sinking funds should you have?
Start with the three to five costs that hurt most when they land, usually insurance, car costs and gifts. Group small predictable costs (a $40 membership, a $60 software renewal) into one “annual irregulars” fund. Add a fund when a new cost shows up twice. A long list of tiny funds adds bookkeeping without adding much control.
A worked plan: starting late in the year
Funds rarely start on January 1. An illustration with three funds and different months left:
| Fund | Cost | Months left | Monthly |
|---|---|---|---|
| Holiday gifts | $600 | 4 | $150 |
| Car insurance | $1,200 | 8 | $150 |
| Car service | $500 | 10 | $50 |
| Total | $350 |
$350 may not fit this month. Three ways to close the gap: lower the gift target, pay part of the insurance from the regular budget this year, or accept a smaller fund and cover the rest when the bill lands. From the next cycle each fund has a full 12 months and the monthly amounts drop: gifts $50, insurance $100, car service about $42.
Where to keep sinking fund money
| Setup | Good at | Watch out for |
|---|---|---|
| One savings account + a list of funds | Least admin; one transfer a month | Needs a sheet or app to show which dollars belong to which fund |
| Bank sub-accounts or named “pockets” | The split is visible at the bank | Many transfers to set up; check fees |
| Cash envelopes | Hard to spend by accident | Loss or theft; fine for small funds only |
Rules that keep sinking funds working
- Borrowing from a fund needs a payback plan. Took $100 from the gift fund for groceries? Add it back over the next two paydays, or the gap shows up in December.
- Leftovers stay in the fund. Insurance came in $80 under? Keep it for next year’s increase or move it to the emergency fund on purpose.
- Emergencies come from the emergency fund. Sinking funds are for known bills; see how much emergency fund you need.
- Review prices once a year. Renewal notices go up; update the target when they arrive.
Sinking funds on irregular income
A flat monthly transfer may not fit months when pay drops. Fund in order of due date when money comes in: the nearest bill gets topped up first, and good months fill ahead. Our guide to budgeting on an irregular income covers the buffer that makes this easier.
Sinking funds for couples and families
Agree on the list and the monthly total once a year, then decide who transfers how much. A visible list turns “who was saving for the car insurance?” into a line both people approved in advance. If you share finances partly, see a finance app for couples with separate finances.
Tracking sinking funds in Finman
- One goal per fund: enter the amount and due date; My plan on the AI page works out the monthly amount, and What if shows how many months it takes at your pace. Log each contribution as you move money.
- Finding the costs: the subscription tracker lists charges that repeat in your transaction history, and recurring payments show their next due dates.
- Spending-type funds as envelope budgets: for costs like car maintenance, a budget with envelope (rollover) mode carries the unspent part forward each month, so the balance builds until the garage bill arrives.
- Households: the Family plan shares household budgets with up to five members.
Set up your sinking funds tonight
Import a year of statements, spot the annual charges, create a goal per fund. Free during the open beta, no card.
Start a Sinking Fund FreeFrequently asked questions
How do I set up sinking funds?
List every non-monthly cost from 12 months of statements, give each a price and due month, divide each cost by the months left, and automate one payday transfer to a savings account. Track each fund as a line in a sheet or a goal in an app, pay the bill from the fund, then restart.
How many sinking funds should I have?
Start with the three to five costs that hurt most, such as insurance, car costs and gifts, and group small predictable costs into one annual irregulars fund. Add a new fund when a cost appears twice.
How much should I put in a sinking fund each month?
Divide the cost by the months until it is due. $1,200 due in 12 months is $100 a month; $600 due in 4 months is $150. Add the monthly amounts across all funds to get your total transfer.
Do I need a separate bank account for each sinking fund?
One savings account kept for sinking funds is enough if you track each fund as a line in a spreadsheet or a goal in an app. Sub-accounts or named pockets at your bank show the split at the bank, with more transfers to manage.
What are common sinking fund categories?
Car insurance, car service and tires, vehicle registration, holidays and gifts, home maintenance, property tax, annual subscriptions, back-to-school costs, travel and out-of-pocket medical or dental costs.
What if a sinking fund is short when the bill is due?
Pay the gap from the regular budget or the buffer, and raise the monthly amount for the next cycle. When you start late, lower the target, extend the date if you can, or accept a partial fund for the first year.
Make irregular bills boring
A goal per fund, a monthly amount for each, budgets that roll over. Free during the open beta.
Try Finman FreeRelated reading: What is a sinking fund? · How much emergency fund · Holiday spending budget · Automatic savings goals