It’s impossible because they don’t charge your card they are authorizing it.
If they authorize it for an amount and it’s more than your credit limit, the card is simply declined.
Authorization just puts a hold on some of your credit line. When the transaction is done, in this case when you return the car, the card is billed for the actual amount and the hold is released.
For example.
Rate for car is $20/week
Your credit limit is $1,000 (no outstanding balance)
Acme car rental authorizes the credit card for $750.00
This places a hold on that amount and means you can only use the remaining $250.00 on the card
When you return the car, the credit card company bills you $20.00 (let’s keep it simple and forget about taxes and service fees).
Then when they put the charges through (usually this is done at midnight), THIS IS WHEN your charged $20.00 and the remaing $730 will be released back to you for your use. Usually this release happens in 1 to 3 days.
Just be aware car rentals companies are notorious for authorizing as much as they possibly can.
I used to work in hotels in Florida, and I can’t tell you the number of times someone went to check in and I said, “Sorry your Visa has been declined.”
The guest is like “How is that possible? It’s a new card” Or “I am paid up.” Or “I don’t owe anything.”
Then I’d say “Did you rent a car.” The guest says “of course.” Then I say, I suggest you call your credit card company and see how much authorization the car rental took.
Every single time, the car rental agency, maxed out the authorization. Then the guest has to call the rental company and get some of the money released back right away so they can use the credit card for other things