So I opened an account with IB, but I just discovered I can't short sell stocks because it's a cash account. I'm 18 with $3,000 (the minimum to open an account at IB). However, you must be 21 or older and have $10,000+ to open a margin account, the type of account that lets you short sell stocks. Is there any way I can still short sell stocks? One of the reasons I chose IB is because of their great availability of shares to short.