The deposit is the single most common thing customers complain about, and almost none of those complaints are about the amount. They are about not knowing.
A customer who was told at the counter that four hundred euros would be held for ten working days, and then saw exactly that happen, does not write a review about it. A customer who had four hundred euros held, heard nothing for three weeks, and then received three hundred and twenty with no explanation, writes two.
So the deposit is a communication problem wearing the costume of a financial one.
How much to hold
Two things set the figure, and neither of them is the value of the car.
Your insurance excess. This is the real number. If a claim costs you eight hundred before the insurer pays anything, a two hundred euro deposit protects you from very little. The deposit exists to cover the gap you would otherwise absorb.
What the customer will accept. A deposit larger than the rental itself reads as a trap, and it loses you bookings before it ever protects you. Most independent agencies land somewhere between three hundred and a thousand, higher for premium vehicles and for young drivers.
Set it per vehicle category rather than per rental, write the figure into the agreement, and say it out loud at the counter. A number nobody was surprised by is a number nobody disputes.
Hold or charge
A hold, sometimes called a pre-authorisation, reserves the amount on the card without taking it. A charge takes the money and requires a refund to give it back.
Prefer the hold. It is faster to release, it never appears as a refund on the customer's statement, and it does not put you in the position of owing somebody money. Its limitation is that holds expire, usually between seven and thirty days depending on the card, so a long rental may need the hold refreshed.
Whatever you use, say which one it is. "We hold four hundred and release it when the car comes back" and "We take four hundred and refund it when the car comes back" sound similar at the counter and feel completely different on a bank statement.
Release it before you are asked
The single change that removes most deposit complaints costs nothing: tell the customer when the deposit was released, at the moment you release it.
A one-line message is enough. The car came back, the deposit was released, the bank may take a few days to show it. Now the delay belongs to the bank rather than to you, and the customer knows the difference.
Release on return, not on inspection, unless you have found something. A deposit held for a week "just in case" while nobody is looking at the car is the most common reason a first-time customer does not come back.
What you may keep, and how to prove it
Four rules, and the fourth is the one that matters.
Only for what the agreement names. Damage, missing fuel, a lost key, an unpaid toll, a late return. If it is not in the agreement the customer signed, it is not yours to keep.
Only for what was not there at handover. This is the entire purpose of the condition report. Photographs, timestamped, showing the whole vehicle, acknowledged by the customer. Without it you are asserting and they are denying.
Only what it actually cost. A scratch is a repair quote, not a round number. The moment your deduction looks like a punishment rather than a cost, it stops being defensible.
Tell them before you take it. Send the photographs, the quote and the amount, and say what is left and when it returns. A deduction explained in advance is a conversation. The same deduction discovered on a bank statement is a chargeback, and the bank will usually side with the customer when the agency cannot produce evidence from the day of handover.
The four situations that go wrong
The release nobody mentioned. Handled above, and it is most of them.
The deposit taken again on extension. A customer extends by three days, and the system places a second hold without releasing the first. They now have eight hundred euros unavailable and no idea why.
The foreign card. A hold in a different currency can move a little by the time it is released, and the customer sees a small difference they did not expect. Say so in advance and it is a non-event.
The damage found after the next rental. Once another customer has driven the car, you cannot honestly attribute the damage. Inspect on return, every time, even briefly. A deposit you cannot defend is a deposit you should release.
Read next
The clauses that make a deduction defensible are in the vehicle rental agreement, and the charges that arrive weeks later are covered in charging tolls and fines back to the renter.
Questions people ask
How much deposit should a car rental company take?
Set it from your insurance excess rather than from the value of the vehicle, because the excess is what you actually absorb on a claim. Most independent agencies hold between three hundred and a thousand, varying by vehicle category and driver age, and write the figure into the agreement per category.
How long can a rental company hold a deposit?
As long as the agreement states and no longer, which for most agencies means release on return unless something was found. Card pre-authorisations expire on their own between seven and thirty days, but the customer is judging you by when you told them, not by the card network's rules.
Can a rental company keep the deposit for damage?
Only for damage named in the agreement, only where you can show it was not present at handover, and only up to what the repair actually costs. Send the photographs and the quote before you deduct anything, because a deduction discovered on a bank statement usually becomes a chargeback.
What is the difference between a hold and a charge on a deposit?
A hold reserves the amount on the card without taking it, and releasing it is immediate on your side. A charge takes the money and needs a refund to return it, which is slower and appears on the customer's statement twice. Holds are preferable, but they expire, so a long rental may need one renewed.