What Is a Margin Account? How Borrowing to Invest Works

A margin account lets you borrow money from your brokerage to buy more investments than you could with your own cash. It's one of the most misunderstood tools in retail investing — used wisely, it can amplify returns; used carelessly, it can wipe out your portfolio faster than any market crash.

What Is a Margin Account?

A margin account is a brokerage account where the broker lends you money — using your existing investments as collateral — to purchase additional securities. This differs from a cash account, where you can only buy with funds already deposited.

How Margin Works: A Simple Example

Deposit $10,000. Your broker offers 50% initial margin: total buying power = $20,000. You buy $20,000 of stock. If it rises 20%, your position reaches $24,000. Repay the $10,000 loan and keep $14,000 — a 40% return on your original capital, double a cash investor's gain. But if the stock drops 20%, your position falls to $16,000. After repaying the loan, you're left with $6,000 — a 40% loss.

Key Terms

• Initial margin: Minimum % of the purchase you pay yourself (typically 30–50% in Canada).
• Maintenance margin: Minimum equity you must keep in the account at all times.
• Margin call: When equity drops below maintenance, your broker demands more cash or forces a sale.
• Margin interest rate: Typically prime rate + 1–3% annually at Canadian brokerages.

Margin in Canada: What's Different

Margin accounts in Canada are regulated by CIRO. The minimum margin requirement for most equities is 30% of market value. Critical note: you cannot hold a margin account inside a TFSA or RRSP. Margin must live in a non-registered taxable account.

Risks of Margin Investing

• Amplified losses: Leverage works both ways, equally.
• Margin calls: You may be forced to sell at exactly the wrong time.
• Interest drag: At 6–8% annually, your portfolio must outperform borrowing costs just to break even.
• Forced liquidation: Your broker can sell your positions without warning or consent.
• Psychological pressure: Leveraged portfolios are much harder to hold through downturns.

Who Should Use a Margin Account?

Margin suits experienced investors who understand the risks, have stable income to cover margin calls, use leverage conservatively (not to the maximum), and have a clear strategy — not speculative bets. If you're new to investing, build your foundation in a cash account first.

Bottom Line

A margin account is powerful but dangerous. Used conservatively with a clear plan, it can be a legitimate tool for advanced investors. Used aggressively or naively, it accelerates losses in ways that can permanently set back a portfolio.