The amount of money authorized against your card may vary depending on the car rental company and the type of car you rent. It is typically based on the estimated cost of the rental, including the daily rental rate, taxes, fees, and any additional charges such as for extra drivers or insurance.
The purpose of this authorization is to ensure that the car rental company has a way to cover any costs incurred during the rental period, such as damage to the car, unpaid tolls, or parking tickets. If you do not incur any additional charges, the authorized amount will be released back to your card after the rental period is over.
It is important to note that the authorized amount is not a charge, so it will not affect your credit score. However, it can reduce your available credit limit, which may affect your ability to make other purchases until the hold is released.
If you have any questions about the authorized amount on your credit card, be sure to ask your car rental agent or to refer to the terms and conditions of the rental agreement.