Actually, no. You will only be banned for using multiple accounts if you were previously banned in one of them (ban evading which might eventually lead to IP ban too) or make an alt to talk to someone who has blocked you (block evading)
Otherwise you can have as many accounts as you please, otherwise people would not make accounts for different content they post, PLZ accounts, etc
did you know that with one e-mail adress you can make up to three accounts?