Ask most people how much does my car cost a month and the answer comes back fast, to the dollar, and wrong. It is the payment. Sometimes the payment and a guess at the fuel.

That is not carelessness. It is the only number that behaves like a monthly number.

AAA published its 2026 Your Driving Costs study on 15 September 2026, and it puts the average new vehicle at $12,863 a year, or $1,071.92 a month. Experian has the average new-car payment at $765 a month for the second quarter of 2026, checked the same day.

Three hundred dollars a month, give or take, is living somewhere you never look.

How much does my car cost a month, on the national average

Start with the number everyone quotes, because it is worth knowing and it is worth knowing what it is not.

AAA’s 2026 figure is $12,863 a year, $1,071.92 a month. Checked on AAA’s own newsroom on 15 September 2026. Underneath it is a specific piece of arithmetic: a new vehicle, over five years and 75,000 miles, averaged across seven vehicle categories and 34 top-selling models, counting fuel, maintenance, repair and tyres, licence, registration and taxes, depreciation and finance charges.

Read that twice and you will see the shape of the car it describes. It is new. It is financed. It does fifteen thousand miles a year.

If your car is nine years old, paid off, and does six thousand miles a year, the average is describing a different object.

The spread inside AAA’s own study says the same thing. A petrol-powered medium sedan came out at $10,582 a year. The equivalent electric medium sedan came out at $13,662, which AAA puts at 29.1 per cent higher, and the fuel saving does not close the gap. Same study, same method, three thousand dollars apart.

So the average is a useful sanity check and a useless personal answer. The rest of this is about getting the personal one.

Four rhythms, and you only ever watch one

Everything a car costs you arrives on one of four clocks, and the reason your estimate is low is that three of them are silent for most of the year.

Monthly. The payment, the fuel, the parking permit. Twelve sightings a year, every one of them while you are looking. This is the lane your mental figure is built from, and it is complete.

Annual. Insurance, registration or road tax, the inspection. Three envelopes, and eleven months of nothing in between. Divided by twelve these are large, and nobody divides them by twelve.

The odometer. Tyres, brake pads, the big service at a set mileage. These do not even have a date to expect, which is why they land as a surprise on a car that has been behaving perfectly.

Never. Depreciation, which produces no statement, no letter and no notification, and is the largest of the four.

Here is the part that fixes it, and it is smaller than you would think. Photograph the fuel receipt on the forecourt and Chirpy reads the amount, the date and the merchant and files it against the car as a spend. Photograph the insurance renewal letter when it lands and the Car tool takes the premium, the renewal date and the policy reference off it. You are not keeping a log. You are taking two photographs a month, and twelve months later the four lanes have added themselves up. Chirpy Basic is free for the whole household, no card.

The capture habit is the same one that makes bill tracking work, and an app that scans receipts goes through why the filing afterwards matters more than the scanning itself.

The biggest cost never lands on a statement

AAA puts depreciation at a weighted average of $4,422 a year across the vehicles in the 2026 study. Checked 15 September 2026.

Set that against the $12,863 total and it is better than a third of everything the car costs. It is also the one cost that has never once appeared in your banking app.

You pay it in a single lump, years later, in the form of the car being worth less than you remember when you come to sell it. That delay is why it is missing from every figure quoted from memory, including the one you gave at the top of this page.

There is a reason this matters beyond bookkeeping. The keep-or-replace decision is made almost entirely on the visible costs, so a car with an expensive repair history and gentle depreciation looks worse than a newer one quietly losing four thousand a year in silence.

Working out your own number, from twelve months

If you want the figure today rather than a year from now, there is a sitting that gets you most of the way. It takes about half an hour.

Open twelve months of statements, not one. A single month contains every monthly car cost and roughly a twelfth of everything else, so it produces a confident answer that is missing the entire second and third lanes.

Read merchant names rather than amounts. Scanning for big numbers makes you stop at the big numbers; scanning for names makes you stop at the unfamiliar ones, which is where the garage visit you forgot is hiding. The same move is the first step in how to keep track of bills, for the same reason.

One honest thing: if you run a single car and you genuinely like a spreadsheet, a spreadsheet does this perfectly well and costs nothing. It only ever holds what somebody types into it, though, and nobody types on a Tuesday evening with a wet receipt in their hand, which is why Chirpy fills the row from the photograph and shows the running total to both drivers instead of to whoever set the file up.

The figure to end up with

Two numbers, and the second one is the useful one.

1. Cash out of the door, per month. Everything except depreciation, divided by twelve. This is the number for budgeting, because it is money that actually moves.
2. True cost, per month. The same total with depreciation added. This is the number for deciding whether to keep the car, buy a different one, or run one car instead of two.

The person who knows is not the person driving

Ask the other adult in your house what the car costs a month. In most houses you get a pause and then a name.

That is the same failure that makes renewals slip, and it has the same cause: everything about the vehicle lives with one person, on one phone, in one inbox. It works until that person is away in the fortnight the insurance renews.

In Chirpy the car is a household record rather than a personal one. The fuel spends, the service history, the premium and the renewal date sit in one place both drivers can open, and the renewal shows up in the shared week six weeks out instead of on the morning it happens. Say “car tax due 1 March, $290” and it goes in as a dated record with the cost attached, from either phone.

• Both drivers see the total. A running cost only one person can see is a running cost only one person can argue with.
• The document sits with the date. The renewal letter is what you need at the moment you act on it, not the following Saturday when you find it.
• The history survives the phone. Records kept in one person’s notes app end when that phone does.

The mechanical half of this has its own guide. A car service reminder app covers why the odometer lane and the dated lane need different treatment and why most car apps only handle one of them.

What the number is actually for

Nobody works this out for the pleasure of knowing. There are three decisions on the other side of it, and all three are made badly without it.

Whether to shop the renewal. A premium that has climbed eleven per cent a year for three years is obvious the moment the three numbers sit next to each other, and invisible in any year you only saw one of them.

Whether to keep the car. A repair bill feels enormous because it arrives all at once. Against a true monthly cost it is often the cheaper option by a distance, and the newer car that feels sensible is quietly losing more in depreciation than the old one costs in repairs.

Whether you need two. This is the big one and almost nobody has the figure to answer it. The second car’s full cost, insurance and tax and depreciation included, against what taxis or a rental would cost for the handful of days both cars genuinely move at once.

Once the car’s real total is in front of you it tends to change what the rest of the household budget looks like too, which is where how to split bills with unequal incomes becomes a different conversation. The car is frequently the second largest thing a household pays for, and the first one it has never measured.

Common questions