Microchip or ID tag for cats: which one do you need?
A microchip is legally required for every cat in many countries from around a few months of age, while a classic ID tag stays optional but is a handy complement for a quick reunion if the cat escapes.
Why is microchipping mandatory?
Microchip identification links a cat to its owner through a national database that vets, shelters and animal control can consult, a guarantee no other identification method matches in cases of a long-term loss or theft. A vet implants it in a single injection under the skin, at a cost of roughly €50 to €80.
So what's the point of an ID tag?
- Instantly readable without a scanner: any neighbor or passerby can contact the owner directly, unlike a microchip, which needs a dedicated scanner.
- Customizable details: an engraved or printed phone number, sometimes paired with a QR code linking to an online profile, €5 to €15.
- Breakaway safety on the collar: a safety-buckle collar is preferable for a cat that roams freely outdoors.
Should you pick one, or combine both?
The two identification methods complement rather than compete with each other: the microchip remains the legal, permanent reference, while the tag speeds up a reunion in the very first hours, well before anyone reaches for a chip scanner. Our guide on whether a cat should wear a collar covers the safety criteria to check if you go with a tag on a collar. For a cat that regularly roams the garden, a GPS collar covered in our GPS tracker for cats guide can add to these two baseline identifications. Find all our comparisons in the cat accessories category.
How do you keep the identification current over time?
Check once a year, during a routine vet visit, that the national database linked to the chip still shows your current address and phone number, and replace an engraved tag as soon as a number changes rather than waiting for a lost-cat scare to notice. This check takes only a few minutes but remains the single most reliable guarantee of a fast reunion if the cat escapes, far more so than a collar alone with no identification attached.
Frequently asked questions
Can a microchip shift position under the skin?
Rarely, but it can happen; a check during routine vet visits confirms the chip is still reading properly.
Should you update contact details after moving house?
Yes, without fail, on the national identification database; a chip linked to an old address loses much of its value if the cat goes missing.
Does a strictly indoor cat still need a microchip?
Yes, the legal requirement applies to every cat, including ones that never go outside, since an accidental escape is always possible.
This guide is part of Planète Pets’s Cats universe. Our advice is general in nature: for any health concern, your veterinarian remains the only reference.