The car insurance renewal. The holidays. The tires that finally give out. None of these are emergencies. You know they’re coming. They just have a way of landing all at once, in a month that can’t take the hit, and going straight onto a credit card.
A sinking fund is how you stop that. This guide covers what a sinking fund is, the categories worth having, how much to set aside each month, where to keep the money, and how many funds to start with.
What is a sinking fund?
A sinking fund is for a known expense with a rough date and a rough price. You’re saving toward something specific, like a $900 insurance premium in the spring, a $600 holiday budget in December, or a vet visit you know is due.
An emergency fund is for the unknown. A job loss, a surprise medical bill, the water heater that picks the worst week to quit. You don’t know the amount or the timing, so it stays untouched until something goes wrong.
The simplest way to hold the two apart.
- Sinking fund = a planned bill you’re pre-paying in slices.
- Emergency fund = a cushion for the things you can’t plan.
Both matter. But if you lump them together, one bad month raids the money you were saving for insurance, and now the “emergency” is a bill you always knew about.
Sinking fund categories
Search around and you’ll find lists of 50 or 100 sinking fund categories. Most people need a handful. It helps to sort them into four groups, because each behaves a little differently.
Annual and semi-annual bills (the ones that wreck a normal month)
- Car insurance and registration
- Property taxes
- Insurance premiums paid once or twice a year
- Annual subscriptions and memberships (Amazon Prime, a warehouse club, software renewals)
Maintenance and repairs (predictable over time, unpredictable in timing)
- Car maintenance, tires, brakes
- Home repairs and appliances
- Medical, dental, and vet visits
Seasonal and gift spending
- Christmas and holidays
- Birthdays
- Back to school
One-time goals
- A vacation
- A new laptop or phone
- A down payment on something bigger
That last group is the useful distinction most articles skip. An annual bill repeats every year on a schedule. A vacation is a one-time target you fund once and spend. Beacon has a separate bucket type for each, which we’ll get to in a moment.
How much should you save each month?
The math is just division. Take the total you’ll need, divide by the number of months until you need it.
Say car insurance costs $1,200 and it’s due in 6 months.
$1,200 ÷ 6 = $200 a month
If you’re paid every two weeks, that’s roughly $92 from each paycheck, since six months is about 13 paychecks.
That formula is where most guides stop. They hand you the division and leave you to run it on a spreadsheet, redo it every time a date shifts, and remember to move the money yourself.
This is the part Beacon does for you. You create an expense for the bill, set the target amount and the due date, and connect it to your funding schedule. From then on, Beacon works out how much to set aside on each payday so the full amount is there by the due date. If you start late or miss a paycheck, it recalculates the rest so you still land on time. Change the due date and the per-paycheck number updates on its own. You never re-run the math.
For a one-time target like a vacation, a Beacon goal works the same way. Pick an amount and a date, and Beacon paces the contributions for you.
Where to keep your sinking funds
The usual advice is “open a separate account for each fund so you don’t mix them up.” That works, but it means juggling five savings accounts and a spreadsheet to remember which balance belongs to what.
But five accounts was never really the point. What you’re after is separation, so each fund has its own visible balance and the insurance money never quietly becomes grocery money.
Beacon gives you that separation inside one budget, using buckets.
- A vault holds money that’s savings-backed, for funds you want kept well away from day-to-day spending. Good for the holiday fund or a car-repair reserve.
- A goal is checking-backed, for a one-time target you’re building toward and will spend, like a vacation.
- An expense covers the recurring bills with due dates, like insurance or property tax.
Each one is its own bucket with its own balance and progress. Money you set aside this way is separated from your everyday spending, so your Free-to-Spend number reflects only what’s actually yours to use, not what’s already promised to a bill or a goal. No new bank accounts, no mental map of which login holds the Christmas money.
How many should you have?
Start with three to five. More than that up front and funding each one gets thin and easy to abandon.
Pick the funds that cause debt when you’re caught off guard. For most people, it comes down to three.
- The big annual bills (insurance, taxes, registration).
- Car or home repairs.
- The holidays.
Those three cover the expenses that most often force a normal month onto a credit card. Once they’re funding smoothly and you’re comfortable, add the softer ones like a vacation or a new phone.
How to start when money’s tight
Starting a sinking fund when money is tight doesn’t take the full amount, or even a big monthly number. You need the fund to exist and a small, steady contribution going into it.
- Start with a small target, even $20 a paycheck. A partly funded bill still softens the blow.
- Fund the one bill that would hurt most first, then add the next once it’s on track.
- Let it run automatically. A funding schedule moves the slice each payday without you deciding again every time.
Saving a little on a schedule is what turns a scary once-a-year bill into a number you barely notice. The amount matters less than the habit of setting it aside before you can spend it.
Set up your first fund in Beacon
Setting up a sinking fund in Beacon takes about a minute.
- Connect your bank so Beacon can see your paychecks and your spending.
- Create a bucket for the fund. Use an expense for a recurring bill, a goal for a one-time target, or a vault for savings you want kept well back.
- Set the target amount and the date you need it by.
From there, Beacon does the ongoing work. It sets aside a slice on each payday, keeps that money set aside so you don’t spend it by accident, and shows how close each fund is to full. If a due date moves or you fall behind, it re-paces the contributions so you still get there on time. The insurance premium and the holidays get protected first, and what’s left is really yours to spend.
You can fund a bucket a few ways, whether you want it to hit an exact target by the due date, catch up on its own if you fall behind, or just move the same amount every payday. How funding schedules and expenses work covers each option.
Beacon Budget is available on iOS, Android, and the web with a free trial, so you can set up your first fund and see how it feels before you commit.