What are the traps at a car hire desk?
Almost all of them concern insurance, fuel and damage — and they exist because the headline rental rate is frequently sold at or below cost, with the counter being where the margin is made.
Insurance, which is the main one. Rentals typically include basic cover with a very large excess — the amount you pay before insurance applies, frequently over a thousand in local currency. At the desk you will be offered excess reduction at a daily rate that, over a week, can exceed the rental itself. The alternative is standalone excess insurance bought in advance, which is dramatically cheaper and works by reimbursing you after you claim — meaning the rental company still takes the full excess from your card if there is damage, and you reclaim it afterwards. Knowing that distinction before you arrive is the single most valuable thing.
Your credit card may already provide cover, and some policies exclude certain countries and vehicle types — check before relying on it.
Fuel policies. Full to full is the only one that is not a trap. "Full to empty" or prepaid fuel means paying an inflated rate for a full tank and returning it as empty as you dare, with no refund for what is left.
The deposit hold. A substantial amount is held on a credit card, which reduces your available credit for the trip and can take weeks to release. Debit cards are frequently refused, and this catches people out at the counter.
Damage disputes. Take timestamped photographs and video of the entire vehicle before leaving and again on return, including wheels, roof, windscreen and interior, and ensure existing damage is recorded on the form. Charges for damage the renter did not cause are the most common complaint in this industry.
The additions: additional driver fees, young or senior driver surcharges, cross-border permission, one-way fees, child seats at high daily rates, and toll transponders.
Upgrades offered at the desk, which are a sales opportunity rather than a favour.
Check the tyres, spare and documentation before driving away, and know what the local requirements are — some countries require specific equipment to be carried.