Guide

How sinking funds work

Q: What is a sinking fund?

A sinking fund is money you save gradually toward a specific, planned expense — a vacation, car repairs, the holidays. You break the cost into small monthly amounts and set them aside ahead of time, so the money is already there when the expense arrives.

Q: What is the difference between a sinking fund and an emergency fund?

An emergency fund is for the unexpected — a job loss or a surprise bill — and sits untouched until something goes wrong. A sinking fund is for the expected — costs you know are coming — spread into monthly amounts. You want both.

Q: How much should I put in a sinking fund each month?

Divide the target by the number of months until you need it. A $1,200 goal in 8 months is $150 a month. For ongoing funds with no deadline, pick a steady amount you can keep up.

Q: Do I need an app for sinking funds?

No. A simple spreadsheet does everything — you name a goal, set a target and a date, and it works out the monthly amount for you. You can start with a free one.

A sinking fund is the simplest money habit there is: set aside a little each month for a big expense you know is coming, so it never catches you out. Here's how they work — and how to start one today, free.

What is a sinking fund?

A sinking fund is money you save gradually toward a specific, planned expense. Instead of being surprised by a $1,200 vacation or a $600 car repair, you break the cost into small monthly amounts and set them aside ahead of time. When the expense arrives, the money is already there.

The name comes from finance — a "sinking fund" is money set aside over time to cover a known future cost. For a household it just means: name the goal, know the date, save a bit each month.

Sinking fund vs. emergency fund

People mix these up, but they do different jobs:

An emergency fund is for the unexpected — a job loss, a medical bill, the surprise you can't plan for. It sits untouched until something goes wrong.
A sinking fund is for the expected — a vacation in June, the holidays in December, new tires next spring. You know it's coming; you're just spreading the cost.

You want both. The emergency fund keeps you safe; sinking funds keep the planned stuff from turning into emergencies.

How to set one up, in four steps

Name the goal. Vacation, car maintenance, the holidays, a new laptop.
Set a target and a date. "$1,200 by June."
Work out the monthly amount. Target ÷ months left. $1,200 over 8 months = $150 a month.
Move that amount every month — ideally automatically — into a labeled savings pot.

That's the whole method. The only hard part is doing the math for several goals at once and keeping track — which is exactly what a tracker does for you.

Dated funds vs. ongoing funds

Not every fund has a deadline:

Dated funds have a target and an end date — a wedding, a trip. The monthly amount is fixed by the math.
Ongoing funds never end — car maintenance, pet care, home repairs. You pick a steady monthly amount and keep topping it up, so there's always something there when the bill lands.

A good system handles both without pretending the ongoing ones have a finish line.

A few examples

The holidays — $600 by December, starting in January = $50 a month. No December panic.

Car maintenance — $50 a month, ongoing. Tires, brakes, the surprise repair — covered before it happens.

Vacation — $1,200 by June = $150 a month. It's paid for before you go.

The honest date

Here's a small thing that matters: a good tracker shows you the date you're actually on pace for, not the wishful one. If you set a June target but you're saving enough to arrive in April — great, you're ahead. If you're behind, it tells you now, while you can still adjust, instead of in December.

Start your first sinking fund — free

You don't need an app or a subscription. A simple spreadsheet does everything above: you name a goal, set a target and a date, and it works out the monthly number and the honest on-pace date for you. The Sinking Funds Starter is a free Excel tracker for up to three goals — a good way to try the whole idea at no cost.

Get the free starter See what's inside

Made for Excel · instant download · just enter your email

When you're ready for more

When three goals isn't enough, the full Sinking Funds Tracker picks up where the starter leaves off — up to 15 funds, a 40-row activity log, a Google Sheets version and a Midnight Pine dark mode. Same calm design, a lot more room. It's a one-time payment, yours to keep.

Questions

What is a sinking fund?

Money you save gradually toward a specific, planned expense. You break the cost into small monthly amounts and set them aside ahead of time, so it's there when you need it.

Sinking fund vs. emergency fund — what's the difference?

An emergency fund is for the unexpected and sits untouched until something goes wrong. A sinking fund is for the expected, spread into monthly amounts. You want both.

How much should I put in each month?

Divide the target by the months until you need it. A $1,200 goal in 8 months is $150 a month. For ongoing funds, pick a steady amount you can keep up.

Where should I keep the money?

In a separate savings account or clearly labeled pots, so you don't spend it by accident. The tracker holds the plan; the account holds the cash.

Do I need an app?

No. A spreadsheet does everything — and you can start with the free Sinking Funds Starter.

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