Is it possible to rent a car at Munich Airport and drive to Austria? If possible, are there any additional costs?
For cross border rules and possible fees look here:-
To view the CROSS BORDER or FERRY terms and conditions. At STEP2 of our 3 step online booking process, alongside the car photo of your choice, there is a link entitled “IMPORTANT INFORMATION”. Clicking on this link will open an additional smaller window, with the terms and conditions appertaining to that particular car/supplier. Choose then the "CAR" tab and look under "TRAVEL RESTRICTIONS".
Try a few different suppliers as each supplier/vehicle type may have a different cross border rule.
Is there an additional cost for adding a driver?
It will say under "EXTRAS" at STEP3 just before the payment stage. Sometimes there is a green banner above the car photo with the offer "FREE ADDITIONAL DRIVER".
Also, if additional Driver is not offered online during the booking process, then look here also:-
At STEP2 of our 3 step online booking process, to the right of the car photo of your choice, is a link entitled "IMPORTANT INFORMATION". Click on this link and it will open an additional smaller window, where the terms and conditions appertaining to that particular car at your chosen location are displayed. Choose the tab "DRIVER".