TIR carnet: structure, the guarantee chain, and how it opens and closes
A TIR carnet is often talked about as if it were one thing — a permit, a guarantee, a customs pass. It is really a booklet of paired vouchers and counterfoils, one pair consumed at every customs office the load passes through, and the whole procedure only works because of how those pairs are used. This is about the carnet as an object and a procedure; the money side — the guarantee amount and what it does and does not cover — is covered separately.
What a TIR carnet is made of
| Carnet size | What it covers | Typical use |
|---|---|---|
| 4-voucher carnet | covers no more than two transit countries | short routes within a single region |
| 6-voucher carnet | covers up to three countries | a standard one-way route |
| 14- or 20-voucher carnet | covers many transit countries, including a return leg | long corridors like Europe to Central Asia |
| What follows | every customs office crossed uses one voucher-and-counterfoil pair | the carnet physically runs out if the route has more customs offices than it has pairs |
Which size to use is not a formality — a carnet with fewer voucher pairs than the route has customs offices simply cannot cover the journey, and that shortfall shows up at the one border where there is no voucher left to detach.
The carnet is not the guarantee amount
The guarantee amount — up to EUR 100,000 per carnet, and what it does and does not pay for — is a separate question from the carnet itself, and it is covered in full at CMR liability and the TIR guarantee.
What matters here is the mechanics: the carnet is the physical instrument that carries that guarantee across every border on the route, voucher by voucher, and a carnet correctly opened and closed is what lets the guarantee stay dormant — paid out only if something actually goes wrong.
Where the guarantee comes from: the international chain
The carnet itself is printed and distributed by the IRU in Geneva, but it does not reach a haulier directly. In each contracting country a national guaranteeing association, authorised by that country’s customs authorities, issues carnets and stands behind the guarantee domestically, feeding into the international chain the IRU coordinates.
Who can be authorised to use TIR
Access to that system is not automatic. Under Annex 9 of the convention, a haulier needs proven experience — or at least the demonstrated capability to run regular international transport — sound financial standing, and a clean record: no serious or repeated offences against customs or tax law. A written declaration accepting the responsibilities involved goes to the national association before a carnet is ever issued, and the association is obliged to keep checking that the conditions still hold, not just approve once and move on.
How the carnet is opened at the customs office of departure
At the customs office of departure the load is sealed, checked against the goods declaration, and the first voucher is detached and stamped — that is what opens the carnet.
Everything downstream depends on this one step being right: the seal number, the goods description and the weight recorded here are what every later customs office checks against, not the cargo itself. An error at this point travels with the load all the way to destination.
What happens at each customs point
| Customs point | What it does | Why it matters |
|---|---|---|
| Customs office of departure | seals the load, checks it against the goods declaration, detaches the first voucher | this is what opens the carnet |
| Customs offices of transit | check the seal and detach the next voucher, without re-examining the goods | the seal itself is the guarantee there is nothing new to open |
| Customs office of destination | breaks the seal, checks the goods, detaches the final voucher | this is what closes — discharges — the carnet |
| What follows | the goods are physically inspected once, at departure | the whole system rests on the integrity of that one seal |
It is worth being precise about what that division of labour means in practice: customs offices further along the route are not meant to re-examine the goods at all unless they have specific reason to suspect the seal has been broken or tampered with. An intact seal is treated as proof that nothing inside has changed since departure — see the CMR consignment note for the separate document that travels alongside the carnet and covers the contract of carriage itself.
When customs can refuse to accept a carnet
A carnet gets refused or a claim gets triggered for reasons that are almost always procedural rather than about the cargo itself:
- Wrong carnet size for the route — fewer voucher pairs than customs offices to cross
- Seal broken or missing — the single fact the whole transit chain relies on
- Goods description mismatched — weight, packages or marks that do not match the declaration
- Carnet used past its validity date — carnets are valid for a limited period from issue
- Holder not authorised, or authorisation suspended — access to TIR can be withdrawn, not just granted
- Wrong or unapproved customs office used — not every crossing point handles TIR traffic
None of these are really about what is in the truck — they are about whether the paperwork and the physical load still match each other exactly, which is the entire logic the seal is built on.
How the carnet is closed at the customs office of destination
At the customs office of destination the seal is broken, the goods are checked one final time, and the last voucher is detached — that discharges the carnet, and the guarantee behind it goes back to being dormant until the next journey.
Development prospects
The paper carnet is not going away soon, but eTIR — the electronic version, Annex 11 of the convention, in force since 2021 — is gaining real ground on this specific corridor: in summer 2026 the first paperless TIR transport spanning three countries crossed the Caspian, from Azerbaijan by ship to Turkmenbashi, across Turkmenistan and into Uzbekistan via Farap, over 1,200 km under a single electronic procedure. The mechanics above do not change; what changes is how much of it happens on paper.
In short
A TIR carnet is a set of paired vouchers, not a single document, issued through a national association that answers into an international chain coordinated by the IRU, and accessible only to hauliers who meet specific conditions and keep meeting them. Getting the size right, keeping the seal intact, and matching the paperwork to the load exactly is what lets the whole procedure run on trust rather than re-inspection at every border. Send us your route and cargo details and we will confirm what the carnet needs to cover before the truck loads.
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