A margin account lets you borrow money from your brokerage to invest, using your existing holdings as collateral. It can double your buying power — but it also doubles your losses. A 20% market drop on a 2x leveraged position wipes out 40% of your equity, and if your account drops below the maintenance margin, your broker will force-sell your positions at the worst possible time. Margin is a tool for experienced investors with specific strategies (like the Smith Manoeuvre), not for beginners or anyone investing money they can’t afford to lose. The one silver lining: margin interest is generally tax-deductible in a non-registered account.
How Margin Accounts Work
| Feature | Details |
|---|---|
| Borrowing limit | Up to 50% of eligible securities’ value |
| Interest charged | On borrowed amount only |
| Collateral | Your investment holdings |
| Available in registered accounts | ❌ No (non-registered only) |
| Margin call trigger | Equity falls below maintenance margin |
Margin Rates by Brokerage
| Brokerage | Margin Rate | Notes |
|---|---|---|
| Interactive Brokers | ~5.5-6.5% | Lowest in Canada |
| Questrade | As low as Prime -2.5% (top volume/balance tier); higher for typical retail balances | Rate is tiered by balance and trading volume – confirm your tier at questrade.com/pricing (verified August 2026) |
| TD Direct Investing | ~8.75-9.75% | Prime + premium |
| RBC Direct Investing | ~8.75-9.75% | Similar to TD |
| BMO InvestorLine | ~8.50-9.50% | BMO prime + premium |
| Wealthsimple | N/A | No margin available |
Margin Example
| Step | Amount |
|---|---|
| You deposit | $50,000 cash |
| Brokerage lends (50% margin) | $50,000 |
| Total buying power | $100,000 |
| If investment goes up 20% | Portfolio: $120,000 → Your equity: $70,000 (+40% return) |
| If investment goes down 20% | Portfolio: $80,000 → Your equity: $30,000 (-40% return) |
Margin amplifies both gains AND losses.
Margin Call Example
| Scenario | Calculation |
|---|---|
| Starting equity | $50,000 (50% of $100,000 portfolio) |
| Maintenance margin | 30% |
| Margin call triggered when | Equity drops below $30,000 |
| This happens if portfolio drops to | ~$71,400 (equity = $21,400 / $71,400 = 30%) |
| Action required | Deposit cash or sell holdings |
Risks of Margin Trading
Margin is the fastest way that profitable investments become catastrophic losses. A margin call doesn’t wait for the market to recover — your broker will liquidate your holdings to protect themselves, locking in your losses at the worst possible moment. Interest costs of 5.5–9.5% compound daily and eat into your returns even when the market is going up. Before using margin, ask yourself: if this investment drops 30% tomorrow, can I absorb double that loss and still meet the margin call? If the answer is no, don’t use margin.
| Risk | Details |
|---|---|
| Amplified losses | Can lose more than your initial investment |
| Margin calls | Forced selling at the worst time |
| Interest costs | Compound daily, eat into returns |
| Forced liquidation | Broker may sell without your consent |
| Market volatility | Short-term drops can trigger calls even on good investments |
When Margin Makes Sense
| Use Case | Risk Level |
|---|---|
| Smith Manoeuvre (HELOC investing) | Moderate (structured strategy) |
| Short-term bridge financing | Low-moderate |
| Leveraged long-term investing | High |
| Day trading on margin | Very high |
| Speculative bets | ❌ Extremely high |
Who Should Use a Margin Account
| Profile | Recommendation |
|---|---|
| Experienced investor, tax-deductible leverage | ✅ May benefit |
| Smith Manoeuvre strategy | ✅ Structured approach |
| Beginner investor | ❌ Too risky |
| Can’t afford to lose borrowed money | ❌ Avoid |
The Bottom Line
Margin accounts are powerful tools that most investors should avoid. If you’re experienced and using a structured strategy like the Smith Manoeuvre with tax-deductible interest, margin can enhance returns. For everyone else, the risk of amplified losses and forced liquidation at the worst time outweighs any potential benefit. Interactive Brokers offers the lowest margin rates in Canada if you do proceed.
The Smith Manoeuvre: using margin for tax-deductible investing
The Smith Manoeuvre is the most commonly discussed legitimate use of a margin account or HELOC for Canadian investors. The strategy converts mortgage interest (non-deductible) into investment loan interest (tax-deductible):
- Use a readvanceable mortgage to borrow against your home equity as you pay down your mortgage
- Invest the borrowed funds in dividend-paying Canadian stocks or eligible ETFs
- Deduct the loan interest on your tax return (since funds are borrowed to earn investment income)
- Use the tax refund to make extra mortgage payments, accelerating paydown
The investment loan interest deduction requires the borrowed funds to be invested in assets with a reasonable expectation of income (dividends, not pure growth). For the full strategy and risks, see Smith Manoeuvre.
Key risks: If your investments drop significantly, you face a margin call, possible forced sales, and a remaining loan balance against a depleted portfolio. This is an advanced strategy suited to disciplined investors with stable income and significant home equity.
Frequently asked questions
Is margin interest tax-deductible in Canada? Yes — if the borrowed funds are used to earn investment income (dividends, interest, or business income). The loan must trace directly to eligible investments. Pure capital gains investments (e.g., gold, cryptocurrency, non-dividend stocks) are less clear-cut and should be confirmed with a tax advisor.
What is a margin call? A margin call occurs when your account equity falls below the maintenance margin (typically 30% of market value for eligible securities). Your broker will demand you deposit additional funds or sell holdings to restore the required ratio. Margin calls can be forced at the worst possible time — during market declines — amplifying losses.