What is a margin account? A margin account allows you to increase your purchasing power by borrowing against the securities deposited in your account. (Registered accounts are not permitted to trade on margin). Related articles What are the margin policies at Qtrade? How much interest will I be charged when using a margin account? How can I tell if a stock is marginable or not? How do I transfer cash or margin into my account? Which Money Market or High Interest Savings Account (HISA) funds can I buy?