Sinking Funds: How Much to Actually Save for Each One

Every article about sinking funds gives you the same list. Car repairs. Christmas. Medical. Travel. You nod, you write them down, and then you sit there with a blank tracker wondering what number goes next to each one.

That’s the part nobody explains. So here’s the method, then the numbers.

What a sinking fund actually is

A sinking fund is money you set aside every month for an expense you know is coming but that doesn’t arrive every month.

Your car will need tires. Christmas happens in December. The dog will need shots. None of these are emergencies — you know they’re coming. A sinking fund turns a $600 surprise into six months of $100, which your budget can absorb without flinching.

That’s the whole idea. The emergency fund is for the things you can’t predict. Sinking funds are for the things you can.

The formula that replaces guessing

Every sinking fund amount comes from the same calculation:

What it costs over a year, divided by twelve.

That’s it. If you spend around $600 a year on Christmas, that’s $50 a month starting in January. If your car costs you $900 a year in repairs and maintenance, that’s $75 a month.

Two adjustments make it work in real life:

Start from your own history, not an average. Scroll back through last year’s bank statements and add up what you actually spent on car repairs, or vet bills, or gifts. Your number is better than anyone’s estimate, because it’s yours.

Divide by the months you have left, not twelve. If it’s August and Christmas costs you $600, you have four months, not twelve. That’s $150 a month, not $50. Starting late costs more — which is the real argument for starting now rather than in January.

The six funds worth having, and where to start

These ranges are starting points for a typical household, not prescriptions. Run your own numbers as soon as you have a month or two of history.

Car repairs and maintenance — $50 to $100 a month

Tires, brakes, oil changes, registration, the thing the mechanic finds while doing something else. Older cars sit at the top of that range or above it. If you drive something newer and under warranty, the low end is fine.

This is the fund most people wish they’d started sooner, because car repairs are both expensive and non-negotiable — you usually can’t postpone them.

Christmas and gifts — $25 to $75 a month

Work backward from what you actually spent last December. Include everything: gifts, wrapping, travel to see family, the extra groceries, the office thing you forgot about. Most people underestimate this by about half because they only count the gifts.

Twelve months of $50 is a $600 Christmas paid for in advance. Four months of $50 is a $200 Christmas and a January credit card balance.

Medical — $30 to $100 a month

Copays, prescriptions, dental work, the deductible you’ll hit at some point. If you have a high-deductible plan, aim toward the top of the range or higher, because the whole point of that plan is that you cover more before insurance does.

Dental is the one people forget. A crown costs more than most car repairs.

Travel and vacation — $50 to $200 a month

The widest range here, because this one is entirely a choice. A weekend away twice a year is a different number from a week somewhere with flights.

Pick the trip you actually want, price it roughly, divide by the months until you go. This fund is easier to stay motivated about than the others, which makes it a good one to start with if you’ve never run a sinking fund before.

Home repairs — $50 to $150 a month, if you own

Renters can skip this one. Owners can’t. Water heaters, appliances, roof patches, the plumber. A common rule of thumb is 1% of your home’s value per year, which is worth calculating even if the number makes you wince.

If you rent, put this money toward the travel fund or a security-deposit fund instead.

Pets — $25 to $75 a month

Annual vet visits, vaccinations, flea and tick treatment, grooming, boarding when you travel. The range depends on how many animals and how old they are.

The reason to run this as a sinking fund rather than absorbing it into groceries: emergency vet visits are expensive and they arrive without warning, and it’s a genuinely awful decision to make with no money set aside.

Don’t start all six at once

Six funds at the middle of those ranges is roughly $400 a month, which for most people is not realistic on day one.

Start with two. The one that would hurt most if it happened tomorrow, and the one you’re most excited about. For most people that’s car repairs and travel — one defensive, one motivating. Add a third when those two feel automatic.

A fund you actually feed every month beats six funds you abandon in March.

Where to keep the money

Two options, and it depends on how you budget.

A separate savings account works if you’d rather not have cash in the house. One account for all sinking funds, with a tracker telling you how much of the balance belongs to which fund. The money earns a little interest and it’s harder to spend on impulse.

Cash in envelopes works if you’re already doing cash stuffing. Seeing the Christmas envelope fill up does something a bank balance doesn’t. The downside is obvious: cash at home, no interest.

Either way, the tracker is what makes it work. A savings account with $1,400 in it tells you nothing. A tracker showing $400 car, $600 Christmas, $400 travel tells you whether you can actually afford the tires.

The tracker I use

This is the part I built a product around, so take it as the pitch it is — but the reason it exists is that I couldn’t make the tracking work on notebook paper.

My Sinking Funds Planner is five printable pages: a tracker for all your funds at a glance, a savings goal breakdown that does the divide-by-months math for you, a monthly plan, a deposit log, and an ideas worksheet for funds you haven’t thought of yet. US Letter, undated, print it as many times as you like.

It’s a few dollars and it’s the cheapest thing in my shop, because the point is that you start.

If you’re running a cash envelope system rather than a savings account, the Cash Envelope Binder Kit includes a sinking funds page alongside the category labels, envelope tracker, and monthly budget, in A6 and A5 for binders.

One honest caveat

I’m not a financial advisor and none of this is financial advice. It’s how I think about planning for expenses I know are coming. Your situation, your numbers, your call.