Under 18 you are not able to form fully valid contracts in Germany. Period. If you're under 13 any contract that exceeds reasonable monthly allowance is automa

Under 18 you are not able to form fully valid contracts in Germany. Period. If you're under 13 any contract that exceeds reasonable monthly allowance is automatically invalid. All other contracts or "floating/pending valid", ie valid until the parents agree. There is also a clause on 16 to 18 year old kids but IIRC it just shifts responsibility away from the parents more. A contract that is "floating/pending valid" is usually not a problem, it just means the parents can terminate the contract as if it never existed within reasonable bounds (if you bought something from the supermarket and ate it, your parents won't be able to get the money back)