How old do I need to be to use Splitit? July 05, 2020 04:44 Updated You need to be 18+ years old to use Splitit. Related articles Is there an application process for Splitit? There's something wrong with my order. Do I need to pay? What happens to my credit score if I use Splitit? Why Choose Splitit Payments? Can I pay off my installments early? Comments 0 comments Please sign in to leave a comment.