Car rental security deposits: pre-authorisation, capture, release

Flotly Team - published 11 September 2026 · 7 min read

How a car rental security deposit works for the rental company: card pre-authorisation hold, partial or full capture backed by evidence, release. What to write in the agreement and what to tell the customer.

A car rental security deposit covers what the renter owes at return: damage they remain liable for up to the insurance excess, missing fuel, charges set out in the agreement. Most often it takes the form of a card pre-authorisation: a hold that blocks the amount on the card without charging it. At return, the rental company releases the hold if everything is in order, or captures all or part of the amount, with supporting evidence, if damage or a breach is found.

This article describes the mechanism from the rental company’s point of view: pre-authorisation, capture, release, and what each step requires in the agreement and in the way you communicate with the customer.

Hold or charge: two different approaches

Charging the deposit means taking the money and refunding it at return. Easy to understand, but heavy: the customer sees their balance drop, the refund takes time, and every transaction generates payment fees.

Placing a hold means asking the customer’s bank to reserve the amount without taking it. The card’s available limit is reduced for the duration of the rental; if nothing is captured, the hold disappears without a single euro changing hands. This is the method preferred by rental companies equipped with a terminal or with an online payment provider that supports it: Stripe, in Flotly’s case, with a pre-authorisation whose capture stays in the rental company’s hands.

Two limits to know. A hold has a validity period set by the card networks and the banks: for a long rental, you need to plan for renewing it. And some cards (cards that require systematic authorisation, prepaid cards) do not always allow a pre-authorisation: the agreement must say what happens in that case.

Setting the amount

The deposit amount is based on what it needs to cover, not on what “everyone else does”. In practice, it is consistent with the insurance excess the renter remains liable for, plus plausible charges (fuel, cleaning). A deposit higher than the excess is hard to justify to the customer; a lower one leaves the rental company exposed down to the last euro.

The amount, its form and the conditions for retaining it are written into the agreement and announced before booking. A customer who discovers the deposit at the counter starts the rental on a note of distrust.

Capture: only with supporting evidence

Capturing, whether partially or in full, is only legitimate when three things come together:

1. A finding: the return condition report, compared with the pick-up report, showing new damage or a breach (fuel, cleanliness, missing accessory).
2. A cost: a repair quote, an invoice, or a price from the damage scale set out in the agreement for common damage.
3. Information for the customer: the details of what is retained and why, sent in writing, with the photos.

Capturing the whole deposit “just in case” while waiting for a quote is the most frequent source of disputes. If the estimate isn’t available right away, good practice is to capture the amount you can justify and tell the customer what happens next.

In Flotly, comparing the pick-up and return condition reports isolates the new damage; the rental company then decides how much to capture from the Stripe pre-authorisation, partially or in full, and the rest is released. The damage charged appears on the invoice, filed with the rental. The inspection grid that makes this capture defensible is described in our condition report checklist.

Release: promptly, and say so

If the vehicle comes back in order, the hold should be released without delay. The customer sees the amount return to their available limit after a delay that depends on their bank, not on the rental company. Hence the value of a clear message: “your deposit was released today; your bank may take a few days to show it”. That one sentence saves you the worried phone call the following week.

A forgotten deposit that is never released is a real case in branches that handle it by hand. That is why Flotly automatically releases uncaptured deposits after a grace period set by the rental company, in addition to manual release.

What the agreement should say

• Deposit amount and form (hold or charge).
• What it covers, and how it relates to the insurance excess.
• Conditions for a deduction: joint inspection report, proof of cost, written notice.
• Release time frame and method, with a note that the time it takes to show depends on the customer’s bank.
• What happens with cards that do not allow a hold.

These points belong in the deposit section of the agreement; the other sections are covered in what a vehicle rental agreement between a business and a consumer must contain.

Three mistakes to avoid

1. A deposit only announced at the counter: it must appear in the booking catalogue and in the confirmation.
2. A deduction without a pick-up photo: with no point of comparison, the deduction doesn’t hold.
3. A “round” amount retained, with no quote or price scale: it will be disputed, and often rightly so.