Sinking funds for car repairs work out at £57.74 a month for the household in this write-up — £692.80 for the year, made of four bills and not one of them a surprise: the MOT at £54.85, a full service from £271.95, £200 of vehicle tax, and £166 of tyres. Three of those four have a date printed on them already. Only the fourth is a guess, and last year’s invoice is the best guess anyone has.
The four bills, priced
Every figure here is a published price or this household’s own invoice. None of it is an estimate of what a car “typically” costs.
| Bill | This household | Source |
|---|---|---|
| MOT test | £54.85 | GOV.UK caps the fee for a car at £54.85, with no VAT on top |
| Full service | £271.95 | the garage’s own published price table (1,401–2,000 cc, “from”), read 2026-09-17 |
| Vehicle tax | £200.00 | GOV.UK standard rate, single 12-month payment |
| Tyres | £166.00 | last year’s invoice: two tyres, fitted |
| The year | £692.80 | |
| Divided by twelve | £57.74 a month |
The test fee is a statutory maximum, so it cannot surprise you upwards. The service price is on the garage’s website before anyone picks up a phone. The tax is a rate table. Only the tyres came from the household’s own paperwork — which is the point of the next section.
Why three of the four are not unpredictable
A budget that treats car costs as random is wrong about three quarters of them.
- The MOT is due on the expiry date printed on the last certificate, a year ahead.
- The service is due on the interval in the handbook, usually twelve months or a mileage.
- The tax renews on a date the DVLA has known since the day the car was registered, and it sends a letter.
That leaves the repair. You size it the way you size groceries: from your own receipts. Two tyres at £166 last year is a better number than any national average, because it is your car, your mileage and your garage.
The week that actually empties the account
The MOT and the service arrive in the same week, because the garage does both in one visit. For this household that is just over £326 out of a month that already has £620 of rent in it, on take-home of £1,280.
That is the week the card comes out — not because anything went wrong, but because nothing was set aside. The bills were both dated a year in advance.
Paying the vehicle tax by monthly direct debit costs £210 instead of £200 (GOV.UK, the same rate table). That £10 is the price of splitting a bill into twelfths. An envelope splits it into twelfths for nothing, and the tax still goes out in one payment.
How to do it on paper
You do not need an app for the arithmetic. Four numbers, one division:
- Your test fee. The capped figure, or what your station actually charges (most charge less than the cap).
- Your garage’s service price. Look it up on their site once; write it down.
- Your tax renewal. The standard rate for a car registered since April 2017, or your own band.
- Your last repair invoice. Whatever broke last year, at the price you actually paid.
Add them. Divide by twelve. Put the answer somewhere you will not spend it before the MOT month. If you want to sanity-check the monthly figure against a date, the savings goal calculator does the same division with a deadline attached.
Paper does the arithmetic perfectly. What paper cannot do is take the money out of the balance you can see — which is why the money has to leave the current account, or at least stop being counted in it.
Doing it in Zeroed
I built Zeroed for exactly this kind of envelope. The car fund is one line in the same budget as the rent, funded on the day the money arrives, so the £57.74 is gone from the spendable balance before the month starts. When the garage week comes, the envelope pays for it and the month does not notice.
It is one payment, it works offline, and it never asks for your bank login. The method works on paper and in any envelope app; the app is where I keep mine.
Frequently asked
Sinking fund for car maintenance — what should it include? The MOT, the service, the tax and whatever breaks. Insurance is usually its own fund because it is one annual bill with its own renewal date, and fuel is a monthly cost rather than a sinking fund.
How much to put in a sinking fund for the car? Add your four figures and divide by twelve. For this household that is £692.80 ÷ 12 = £57.74 a month. If your car is older or does more miles, the fourth number — the repair — is the one that moves.
How much should a sinking fund have in it? Enough to cover the next dated bill when it lands. A car fund that holds one MOT and one service (about £327 here) already survives the week that empties most accounts; a full year of £692.80 covers the tyres too.
How to pay for car repairs with no money? That is the question the fund exists to stop you asking. In the meantime: get the itemised quote, ask which items are MOT failures and which are advisories (advisories can wait), and ask the garage whether the work can be split across two visits. Then start the fund with whatever the next month allows — the first £57.74 is worth more than a plan for £600 you cannot start.
Is the MOT fee always £54.85? That is the maximum a test station may charge for a car. Many charge less, and some offer a free retest within ten working days. Budget for the cap and be pleased when the invoice is smaller.
The honest version
This is education about a budgeting method, not financial advice. The prices here are the ones this household paid or the ones the government publishes; yours will differ, and the method is the same either way. Take your own four numbers, divide by twelve, and let the car year stop being a surprise.