Banking How old do you have to be in South Carolina to have your own bank account? Banking In South Carolina, you can open your own bank account even if you are under the age of 18. In fact, there is a state law that specifically says you can. S.C. Code Section 34-30-1620. Next article: My mother opened up an account for me that she can get into. Can she legally take my money out of there without my permission? Next