Sinking Funds: What They Are, How to Set One Up, and Why Your Budget Needs Them

You receive your car registration bill in your email. Your best friend is getting married in 6 months. The holiday shopping season is almost upon you. All of these are no surprises — but they are always a surprise.

This is where sinking funds come in. When you have a foreseeable expense, you don’t have to scramble around for, you save a bit each month, and the cash arrives when you need it. No debt, no panic, no taking money out of your emergency fund for something that you knew you were going to have to pay for.

Take control of your money, optimize your spending and grow your savings automatically

This guide addresses all of the different categories you can have for sinking funds, how to determine how much you will save in each, where you will save the money and how to incorporate the entire system into your budget.

What Is a Sinking Fund?

A sinking fund is a savings account (or a portion of the savings) earmarked for a certain, anticipated expense. You commit to a monthly payment, and that money will be waiting when the payment is due.

The word is planned. Sinking funds are for one-time expenses that you are expecting, but don’t happen every month: car maintenance, annual insurance premium, holiday shopping, vacation, new tires. They make big or infrequent expenses small and manageable monthly payments without affecting your cash flow.

Key Takeaways

• A sinking fund is a savings account used to fund a definite expense.
• They stop you from overspending your monthly budget or if you do, then they keep you from getting into debt for unusual things.
• Examples of sinking funds are car repair, vacation, medical expenses, home maintenance, travel, and annual subscriptions.
• The amount of money you save is the total cost divided by the number of months until you need it.
• The best place to set up sinking funds is on a high-yield savings account or in a special category of spending.
• Sinking funds vs emergency funds are not the same thing, you need both.

How a Sinking Fund Is Different from Just Saving Money

Saving money and using sinking funds budget are the same, except that there is a different motivation.

In general saving is ambiguous. You haven’t decided on an item to purchase, but you are working to create a financial buffer. A sinking fund is a planned investment. Each fund has a name, a target dollar amount and deadline. It’s that specificity that makes them work.

If you have a specific account for car tires and another account for vacation, then you’re not taking funds from one account to pay for the other. You’ll always be able to see just how much you’ve saved towards a spending goal and how much is remaining. This clarity is helpful not only for staying on track with your finances, and for avoiding the guilt you might experience after purchasing something you didn’t plan for, but also for making it easier to stick to your financial objectives.

Sinking Fund vs. Emergency Fund

Both of these are two instruments used in the budget that are frequently interchangeable, yet on one hand, these are serving different functions.

An emergency fund is used for any and all unplanned or unexpected expenses, like a furnace going out of order in January of the year, a job loss, or a medical emergency. You don’t know when and how much it will cost. You’re creating a safety cushion for the unexpected.

A sinking fund is used to pay for typically expected expenses, such as the cost of car registration, a vacation you’ve been looking forward to, or your dog’s annual veterinary visit. You have a general idea of the time of the cost and an approximate value. You’re preparing for what you know.You are getting ready for what you know.

Sinking Fund vs. Savings Account — And How They Compare to an Emergency Fund

Here’s a quick side-by-side look at all three:

Which One Do You Need More — And Which to Build First

If you have no safety net at all, a small emergency fund should come first — even $500 to $1,000 is enough to keep a minor unexpected expense from becoming a credit card balance, a starter amount recommended by Fidelity before working up to a fuller 3–6 month cushion. Once that baseline is in place, you can start building sinking funds for the planned expenses you know are on the horizon. Building a solid emergency fund first is the recommended order for most households.

Ideally, both exist simultaneously. A functioning budget has an emergency fund sitting untouched in the background and sinking funds actively being built and spent for every major planned expense throughout the year.

The Most Common Sinking Funds Examples

A sinking fund can be set up for any expenditure you do not have a specific budget for per month. These are the most typical and most effective categories to keep in mind.

1. Car Maintenance and Repairs

Your car is always in need of something: tires, oil change, brakes, registration, etc. Instead of unexpected car repair expenses, make a fund for car repairs. A good initial range of prices is $50 to $100 per month, depending on the age of the vehicle.

2. Home Repairs and Maintenance

Every homeowner has to deal with a continuous flow of random costs — such as HVAC filters, plumbing problems, appliance repairs and replacements, lawn maintenance, and painting. A widely cited rule of thumb from the Harvard Joint Center for Housing Studies is to save 1% to 2% of the value of your home for annual maintenance, with older or larger homes often landing toward the higher end. That doesn’t seem so big when paid month-to-month.

3. Holiday Gifts and Seasonal Expenses

One of the most predictable expenditures on the calendar is holiday spending — and it always catches people off guard. Calculate the amount of money you require for your holiday (gifts, travel, entertaining, etc.) and save 1/12 of that amount every month. The funds become available in November.

4. Vacation and Travel

A vacation fund takes the bite out of a vacation. Create a travel amount you want to save a year, and save it by the number of months left in your year to travel. When you arrive at the airport, you will not have a credit card hangover.

5. Medical and Dental Expenses

Planned expenses, such as routine checkups, copays, eyeglasses, and dental work, are not considered emergencies and have somewhat predictable annual costs. These do not go into your emergency savings plan, but rather into a medical sinking fund to get out of debt from your credit card.

6. Annual Subscriptions and Insurance Premiums

A lot of individuals pay premiums for their car insurance, life insurance, streaming providers, and software subscriptions once a year to get a discount. If the annual payment is being made, the total payment up front may be a jolt. Set aside monthly to have the money ready for renewal time.

7. Back-to-School and Clothing

Back-to-school time inevitably means a predictable series of costs: pencils, socks, jackets, gymnastics, etc. for children. A clothing fund can be good for you at any age by making big seasonal purchases unnecessary when it comes to your monthly sinking funds budget.

8. Pet Care

The cost of routine veterinarian checks, flea prevention, grooming, and food start to add up. Unexpected veterinary expenses can be significant — but even setting aside money for the known expenses in a sinking fund alleviates the strain on finances and makes pet ownership less difficult.

9. Irregular Bills and Annual Fees

Property taxes, HOA dues, professional dues and registration fees come on a regular basis. Take the yearly total and split it up into 12 months and then store the monthly amounts in your savings account — this way, they’ll be there when the bill comes due.

How to Calculate How Much to Put Into Each Sinking Fund

The math behind sinking funds is simple — what takes thought is estimating costs accurately and deciding which funds to prioritize.

1. Estimate the Total Cost

For each sinking fund category, determine the total dollar amount you’ll need. Some costs are fixed (a $1,200 vacation budget), others require research or estimates (car tires typically run $400–$800 depending on your vehicle). When in doubt, overestimate slightly — you’d rather have money left over than come up short.

2. Set a Target Date

Decide when you need the money. Holiday gifts: November. Annual car registration: your renewal month. Vacation: your planned travel date. Your target date determines how many months you have to save.

3. Divide the Total by Months Remaining

This is the core formula:

Monthly contribution = Total cost ÷ Months until you need it

For example, if your vacation will cost $2,400 and it’s 8 months away: $2,400 ÷ 8 = $300 per month.

If you are establishing a fund with no definite end date (such as a home repair fund), select a monthly contribution that is within your budget and add it regularly.

4. Automate Your Sinking Funds

What transforms a good idea into a system is automation. Automatic payment from your checking account on payday (before you spend it elsewhere). If you can have sub-accounts or savings buckets in your bank, label them each individually and you will always be able to see your balances. It is helpful to always be tracking your spending and your sinking funds so you can see where you can cut back to keep a sinking funds tracker. 

Real List of Sinking Funds With Numbers

Here’s how a sample month of sinking fund contributions might look for a household:

That $620 a month covers more than $7,000 in annual planned expenses — without touching the emergency fund or reaching for a credit card.

Where to Keep Sinking Funds

The ideal location for a sinking fund is a combination of ease of access, organization, and earning potential.

1. High-yield savings account (HYSA): The most common type. Online banks can offer much higher interest rates than traditional savings accounts, so your money is growing while you’re waiting to spend it! Many HYSAs will allow you to create several sub-accounts or “buckets” that are ideal for labeling and organizing all the different types of sinking funds.
2. Individual accounts for each sinking fund: If your bank permits it, you can get separate accounts for every sinking fund, which will make it easy to track sinking funds. It is easy to see at a glance how much is in each fund. The downside is that you’ll have a lot of accounts to keep track of.
3. Money market account: Like a high-yield savings account, but may include check-writing or debit card privileges. Can be a handy option if you have an urgent need to have access to a fund in a hurry.
4. Budgeting app or envelope system: A few people will have all their sinking funds in the same savings account, but will use a budgeting app to keep track of each balance with labeled savings goals. The software partitions the money into virtual envelopes, and the money is in one place. This method is good for individuals who favor simplicity over numerous accounts.

Setting up sinking funds takes an hour of planning and a few minutes of setup. In return, you get a budget that doesn’t break every time a predictable expense shows up. Pair them with a solid emergency fund, use a budgeting app to set up savings goals for each category, keep tracking your expenses with a tool that gives you real visibility, and you’ll find that most of the financial stress people experience around irregular expenses simply disappears. Sinking funds are one of the most concrete steps you can take toward your broader financial goals — because they turn vague intentions into a reliable monthly systemю

Sinking Funds FAQs

What banks have sinking funds?

Most banks don’t offer a product called a “sinking fund” by name — you create one yourself using standard savings accounts or sub-accounts. Online banks like Ally, Marcus, and Capital One 360 are particularly well-suited because they allow multiple labeled savings buckets within a single account.

What is the minimum amount in a sinking fund?

There’s no required minimum. You can start a sinking fund with any amount that fits your budget. Even $10 or $20 per month toward a goal is meaningful over time. The important thing is consistency — contributing regularly, even a small amount, adds up and keeps the habit in place.

What is the sinking fund called now?

“Sinking fund” is the traditional and still widely used term. In personal budgeting communities, you’ll also hear them called savings buckets, sub-savings accounts, targeted savings, or dedicated savings accounts. Some budgeting apps use the term “goals” or “envelopes.” The concept is the same regardless of the label.

Is a sinking fund good or bad?

Sinking funds are genuinely useful for most people. They prevent irregular expenses from disrupting your monthly budget, reduce reliance on credit cards for planned purchases, and make financial goals feel achievable and concrete.

What are the rules for sinking funds?

There are no formal rules, but a few principles make them work:

1. Name each fund. Specificity keeps you motivated and prevents funds from blending.
2. Set a target amount and date. Without a goal, it’s just savings with no direction.
3. Contribute consistently. Automate if possible. Irregular contributions make it hard to hit your targets.
4. Don’t borrow from one fund for another. The whole system breaks down when you treat sinking funds as interchangeable.
5. Replenish after spending. Once you use a fund, start rebuilding it immediately if the expense recurs annually.