Many registration offices introduced mandatory appointments during the coronavirus pandemic, and the vast majority of them still have this obligation and are unlikely to disappear any time soon.
You should therefore not drop by the authority on the spur of the moment, but find out in advance on the Internet whether you need an appointment. Most registration offices allow you to book an appointment directly online.
You must submit the following documents when deregistering:
The registration office will automatically inform your insurance company and the main customs office, so you don't have to do anything else.
By the way, you do not need a registration certificate part II (letter) for deregistration. You also do not need a power of attorney if the registration is in someone else's name, as long as you have the registration certificate and the license plates with you.
The costs of registration can vary from authority to authority and are not regulated nationwide. However, deregistration is very inexpensive, costing between 5 and 10 euros.
If you have registered your car and the buyer refuses to deregister it, you must contact your registration office.
The registration office will issue a new registration certificate and use it to deregister the car. However, this process takes 4 weeks and you have no legal claim to it.