Common mistakes with ATA Carnets

Almost every carnet horror story traces back to one of a handful of mistakes. And the expensive ones are all avoidable. Here they are in order of importance. If one of them has already happened to you, jump straight to Fix a problem for the recovery playbooks.

1. Starting too late

The number-one mistake, and the root cause of most of the others. A first carnet is not a same-day errand: portal registration takes days (a signed contract goes by post), the goods list takes longer than you think, the security needs arranging, and the carnet still has to be activated at customs before departure. Teams that start the week of the trade fair end up doing all of this in a rush. And rushed people fill in lists wrong, skip the activation, and arrive at borders outside opening hours. Stress, panic and improvisation at a customs counter is exactly the situation a carnet exists to prevent.

Avoid it: start two to three weeks before the first trip (first-timers), or about a week if your company already has a portal account. Express services exist (same-day at several Swiss chambers), but treat them as the safety net, not the plan.

2. Filling it in incorrectly

The General List is frozen forever once customs activates the carnet. Mistakes made at the kitchen table become permanent: a robot listed without its serial number can't be identified at the border; a missing battery pack or spare controller can't be added later; an unrealistic value distorts your fees and security. The same goes for the purpose: a carnet declared for "exhibition" raises questions when you're actually doing a customer demo.

Avoid it: one line per serialised item (make, type, serial number, realistic value), include everything that might ever travel, leave consumables off, and have a second person check the list before submitting. Details in the robotics guide.

3. Losing the paperwork

A paper carnet is irreplaceable in the moment: the stamped counterfoils inside it are your only proof that goods left each country in time. Lose the booklet abroad and you're looking at a duplicate from your chamber, extra fees, and awkward conversations at every border until it arrives. And carnets get lost in the most ordinary ways: left in a flight case that went into the truck, in the seat pocket of a rental van, in a hotel room safe.

Avoid it: one folder, one tracker, one person responsible per trip. Photograph every page after every stamp so you always have evidence even if the original disappears. (Digital eATA carnets dodge this problem entirely. One more reason to like them.)

4. Going to the wrong office for the wrong stamp

Not every customs office can do every carnet action. Activating a new carnet needs an office that handles commercial goods, during commercial hours; stamping an opened carnet works at many more places and times; some offices do one but not the other (Geneva's Palexpo office only clears exhibition goods; some small crossings only stamp opened carnets). People show up at a passenger-only counter, or at a commercial office at 19:00, and find the right service closed.

Avoid it: check the specific office and service before you travel. The official Swiss customs directory filters by exactly this. Our guides list it per location: Zurich Airport, Geneva Airport, Basel, road borders.

5. Forgetting stamps altogether

The carnet only works if customs sees it at every crossing, and nobody will stop you to ask. Airports are the classic trap: you walk past customs with your trolley, nobody says anything, and the carnet silently misses its re-export stamp. A missing stamp is the number-one trigger for claims, and fixing one after the fact costs time, evidence-gathering and fees. Sometimes the full duties plus a 10% penalty.

Avoid it: make the customs desk an explicit stop in the travel plan, outbound and inbound, in both countries. After every stamp, check the officer took the right voucher and stamped the right counterfoil. If a stamp did slip through: act within 60 days.

6. Carrying goods that aren't on the list (or altering it)

Tossing an extra battery or replacement sensor into the case after activation puts unlisted goods at the border. They're not covered, and crossing with them undeclared is a customs offence. Equally bad: "fixing" the General List by hand. Nothing may ever be changed or crossed out on the green cover.

Avoid it: the packing list for the trip is the carnet list, not the other way round. Last-minute additions travel on a separate declaration, or not at all.

7. Treating the carnet as the only paperwork

A carnet replaces duty payments and deposits. Nothing else. Export licences (SECO / dual-use; cameras, LiDAR and autonomy can be in scope), lithium-battery transport rules, and country-specific permits all still apply. Teams discover this at the counter, with a fully valid carnet and a blocked shipment.

8. Skipping insurance on the customs exposure

If the robot is stolen or destroyed abroad, the import duties are still due. Customs doesn't waive them for stolen goods. Insure the goods for their value plus 20–50% to cover that contingent liability, or a lost robot becomes a lost robot plus a customs bill.

9. Forgetting the carnet after the trip

The job isn't done at re-import. The carnet must go back to the issuing chamber, unprompted, at the latest on its expiry date. Or else your deposit stays locked, reminder fees accrue, and claims can't be pre-empted. Foreign customs can file claims up to a year after expiry, so keep your records (and expired paper carnets) at least that long.

Avoid it: put three dates in the calendar the day the carnet arrives: the foreign re-export deadline, the expiry date, and a return-to-chamber reminder.

Sources

Every factual claim on this page comes from the sources below, checked on the "last reviewed" date in the footer. Official resources are linked in whatever language they are published in.