Margin

The plain answer

Margin is money you borrow from a brokerage to buy investments. It increases how much you can invest, but it also increases how much you can lose.

For most beginners, a cash account is the safer choice. You can learn more in Cash Accounts vs. Margin Accounts.

How it actually works

When you buy on margin, your investments serve as collateral for the loan. The brokerage charges interest and requires your account to maintain a minimum amount of equity.

If your investments fall enough, the brokerage can demand more cash or sell your holdings. It may sell without waiting for your approval.

Suppose you invest $10,000 of your money and borrow another $10,000. A 25% decline leaves the investments worth $15,000. After repaying the $10,000 loan, only $5,000 of your original money remains, before interest and fees.

What this means for you

Margin turns an ordinary market decline into a larger personal loss. It also adds interest costs, collateral requirements, and the possibility of forced selling at a bad time.

If your goal is long-term wealth building, avoiding borrowed money keeps your plan easier to maintain. See Why Simplicity Wins for the broader case.

Common mistakes

• Treating the brokerage’s borrowing limit as a safe amount to use
• Ignoring interest charges when estimating returns
• Assuming there will always be time to deposit more money after a margin call
• Using margin to recover from a recent loss
• Holding volatile investments with borrowed money

Related pages

• Cash Accounts vs. Margin Accounts
• Options
• The Cost of Complexity