A service book looks like it should come with instructions and never does. There are boxes for a date and a mileage, a space for a stamp, sometimes a signature line, and no explanation of who is supposed to write in them or what happens if a box gets missed. Here is what each field is for, who can legitimately stamp the book, where the line sits on doing it yourself, and why the paperwork behind the stamp is the part that actually carries weight.
Quick answer
The garage that carried out the work fills in the service book: the date, the mileage at the time, the type of service, and its own stamp and signature. There is no official register of who may stamp a book, but the stamp is meant to identify the business that did the work, so stamping your own book for work you did not do as a business is misrepresentation.
In This Guide
- What goes in each field
- Who is allowed to stamp a service book
- Can I stamp my own service book?
- Servicing it yourself, and warranty
- Why invoices matter more than stamps
- Common mistakes
- Keeping it somewhere it cannot be lost
- Frequently asked questions
What Goes In Each Field
Books vary by manufacturer, but the same handful of fields turn up in nearly all of them.
Date of service. The date the work was carried out, not the date it was booked or paid for. Written day first in the UK.
Mileage or odometer reading. The reading at the time of the service. This is the most important number in the book, because it is the one a buyer cross-references against the MOT history to check the story holds together. Write the whole figure, not a rounded one.
Service type or interval. Some books have named types (interim, full, major), others have pre-printed boxes for each scheduled interval such as 20,000 miles or three years. Fill the box that matches the work actually done, not the box that comes next in the sequence.
Garage stamp. An inked stamp carrying the business name, address and usually a phone number. This is what identifies who did the work and what makes the entry checkable, since a buyer can ring the number on it. Our guide to what a service stamp means covers what a stamp does and does not prove.
Signature. Usually the technician or service adviser. Not universal, and its absence is not a problem if the stamp is there.
Next service due. A forward-looking note in date or mileage. Useful to you, irrelevant as evidence.
The front page. Registration, VIN and sometimes the supplying dealer. Worth filling in if it is blank, because a book with no vehicle details in it could belong to any car, and buyers notice.
Who Is Allowed to Stamp a Service Book
There is no legal register of businesses entitled to stamp service books, and no licence involved. What exists is a convention, and the convention is straightforward: the business that carried out the work stamps the book, at the time it does the work.
In practice that means:
- Franchised main dealers, which produces what is usually called full main dealer service history, or FMSH.
- Independent garages, including marque specialists. This produces full service history, or FSH. Our guide to full service history and what qualifies covers the distinction.
- Fast-fit and national chains, for the servicing they carry out.
- Mobile mechanics, who will usually stamp with a business stamp or write and sign the entry.
You will often read that the garage must be VAT registered. That is a rule of thumb rather than a requirement, and it exists because VAT registration is a rough proxy for a real trading business with records that can be checked later. A small garage below the VAT threshold doing genuine work and issuing proper invoices is perfectly legitimate. What matters is that the entry identifies a real business that actually did the job and can confirm it if asked.
Can I Stamp My Own Service Book?
Not for work you did not carry out as a business, no.
The stamp is a claim about who did the work. Applying a garage stamp yourself, or buying a blank stamp and inventing one, misrepresents that, and if the car later sells on the strength of it you are into fraud rather than untidiness. Private sellers are covered by consumer protection rules on misleading a buyer about a material fact, and service history is squarely material.
It is also less convincing than people expect. Stamps get checked against the businesses named, mileages get checked against the MOT record, and eight years of history filled in with the same pen on the same afternoon does not read as eight years of history.
There is one legitimate case that sounds similar and is not: if you run a garage and you service your own car through the business, you stamp it exactly as you would any other customer's car, and you invoice it. The test is whether the business really did the work.
Servicing It Yourself, and Warranty
Plenty of owners service their own cars, particularly older ones, and there is nothing wrong with that. Record it honestly.
The way to do it is to note the date, the mileage and the work carried out, mark it clearly as owner-carried-out rather than stamping it, and keep every parts receipt. Oil, filters, plugs, brake fluid, coolant: the receipts are the evidence, and dated parts receipts matching the intervals tell a buyer a great deal. What you must not do is imply professional servicing that did not happen.
Be realistic about how it is received. A car with a full DIY history sells for less than the same car with a full garage history, because the buyer cannot verify the standard of the work. Detailed receipts narrow the gap without closing it.
On warranty, the position is better than the folklore suggests. Under the UK's Motor Vehicle Block Exemption Order, which replaced the EU block exemption regime in 2023, you are not obliged to use a franchised dealer to keep a manufacturer warranty intact. An independent garage can carry out servicing provided it follows the manufacturer's schedule, uses parts of matching quality and documents the work properly.
Two caveats worth taking seriously. Doing the work yourself is a different question from having an independent garage do it, and manufacturers can and do treat owner-carried-out servicing more sceptically when a claim arises. And extended or aftermarket warranties are separate contracts with their own terms, which are frequently stricter. If the car is in warranty and you are considering either route, read the actual warranty terms rather than a forum post about them.
Why Invoices Matter More Than Stamps
This is the part most people have backwards.
A stamp is a mark in a booklet. It has no serial number, it is not registered anywhere, and rubber stamps can be ordered online by anyone. Its evidential value comes almost entirely from the fact that a buyer could ring the garage named and ask.
An invoice is a document produced by a business as part of its accounting. It carries a date, an amount, an itemised description of the work and the parts used, and there is a matching record at the garage's end, because UK businesses must keep invoice records for six years from the end of the financial year for tax purposes. That is why an invoice is stronger evidence than a stamp, and why a garage can reprint one years later.
The practical consequences:
- Keep the invoice for every stamp. A stamp with a matching invoice is close to unarguable.
- An invoice with no stamp still counts. Plenty of garages have stopped stamping books altogether. It is not a gap in the history, only a gap in the booklet.
- A stamp with no invoice is the weak case. Still worth having, but it is the one a careful buyer probes.
- If you have lost an invoice, ring the garage. Most will reprint it, and the routes are set out in our guide to finding lost service history.
Common Mistakes
Leaving the mileage blank. A dated stamp with no mileage cannot be cross-checked against anything, which halves its usefulness.
Letting the garage stamp the wrong interval box. On books with pre-printed intervals it is easy for a 40,000 mile service to land in the 50,000 box. Check before you drive off; it is trivial to fix at the counter and awkward later.
Filling in the gaps later from memory. Understandable, and it undermines the whole document. Record what you can evidence and be straightforward about the rest.
Backdating. Never. It converts a paperwork problem into a fraud problem.
Assuming the book is the record. It is one copy of part of the record. The invoices are the rest of it, and for a car serviced at franchised dealers the manufacturer holds its own version regardless of what happens to the booklet.
Keeping It Somewhere It Cannot Be Lost
Everything above assumes the book still exists. Given the odds against a small booklet surviving a decade of house moves and previous owners, it is worth taking a copy while it is in front of you.
A digital service book is the practical version of that. You photograph the stamped pages and the invoices, the records are read out of the images, and you check and confirm each one before it counts. Every entry stays labelled with where it came from, so a buyer can see which records have a document behind them, and you send a link rather than arranging to meet with a folder. The paper stays with the car; the copy cannot be lost with it.
Frequently Asked Questions
Who fills in a car service book?
The garage that carries out the service, at the time it does the work. It records the date, the mileage and the service type, and applies its own stamp.
Can any garage stamp a service book?
Any garage that actually did the work can stamp it. There is no approved list and no licence. Franchised dealer stamps produce full main dealer service history, independent stamps produce full service history, and both are legitimate.
Does an independent garage service void my warranty?
No, not by itself. Under the UK Motor Vehicle Block Exemption Order an independent garage can service a car in manufacturer warranty as long as it follows the manufacturer's schedule, uses matching-quality parts and documents the work. Extended and aftermarket warranties have their own terms, so check the contract.
Can I write in my own service book if I service the car myself?
You can record the work, dated and clearly marked as owner-carried-out, and you should keep the parts receipts. What you cannot do is stamp it or write it up in a way that implies a garage did the job.
What if the garage forgot to stamp the book?
Ask them to stamp it retrospectively, taking the invoice with you. Most will. If they will not, the invoice is the evidence and the missing stamp matters far less than it feels like it does.
Is a service book valid without a stamp on every page?
Yes. A history with gaps in the booklet but invoices covering them is a documented history. What buyers dislike is unexplained absence, not an unstamped box.
Related Articles
- Service stamp meaning: what a stamp proves, and what it does not.
- Invoices instead of service stamps: the evidence buyers and dealers actually accept.
- What is full service history?: FSH, FMSH, and what qualifies as which.
- How to digitise a paper service book: taking a copy before the book goes missing.
- Keeping car service records: what to keep and for how long.
Fill it in properly, then copy it. Build a digital service book from photos of your stamped pages and invoices, so a lost booklet never costs you the history again.
Build Your Service Book
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