Did you know you can get a line of credit on your investments? Margin lending is a personal loan that is collateralized by the securities within your investment portfolio

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Many investors are familiar with margin or margin trading, but may be fuzzy on what it is and how it works. That’s understandable, because margin rules differ across asset classes, brokerages, and exchanges.

For example, trading stocks on margin—under Regulation T, or “Reg T”—is quite different from trading futures on margin. But the underlying premise is the same: margin is borrowed money, aka “leverage,” often aimed at magnifying gains (although margin will also magnify losses).

Here are a few basic questions and answers about margin trading.

Why Use Margin?

You get more bang for your trading buck—or at least, that’s the idea. In margin trading, you’re only required to deposit a percentage of the notional value of a given security, which can juice your buying power. Margin provides “leverage” that, by taking greater risk, can enhance returns. Through margin, you put up less than the full cost of a trade, potentially enabling larger trades than could otherwise be made with the actual funds in your account.

What’s Considered “Margin?”

Similar to mortgages and other traditional loans, margin trading typically requires posting collateral with your broker, and you must pay interest on money borrowed. In many cases, securities in your account can act as collateral for the loan.

What Do I Need to Know about Reg T and Other Margin Rules?

Under Reg T, a Federal Reserve Board rule, you can borrow up to 50% of the purchase price of securities that can be purchased on margin, also known as “initial margin” (some brokerages require a deposit greater than 50% of the purchase price).

Exchanges and self-regulatory organizations, such as FINRA, have their own margin trading rules, and brokerages can establish their own margin requirements, so long as they are at least as restrictive as Reg T, according to the U.S. Securities and Exchange Commission. FINRA requires a minimum deposit with a brokerage of $2,000, or 100% of the purchase price, whichever is less. This is known as the “minimum margin.”

How About an Example of Trading on Margin?

Let’s say you want to buy 1,000 shares of a stock that’s currently trading at $50 per share. If you bought it with only the cash in your account, you’d need $50,000. But if you bought the shares through a margin account, you’d only need to have $25,000 in your account to purchase them—the other $25,000 would be covered by margin.

If the stock rises from $50 to $55 a share (for a gain of $5 per share, or $5,000), you’d have a 20% profit, because the gain is based on the $25 per share paid with cash, and excludes the $25 per share paid with funds borrowed from the broker.

But margin cuts both ways. If the stock dropped to $45 a share, you’d have a loss of 20%—double what the loss would be if you paid for the stock entirely in cash.

What Are the Risks of Margin Trading?

Because margin magnifies both profits and losses, it’s possible to lose more than the initial amount used to purchase the stock. This magnifying effect can lead to a “margin call,” when losses exceed a limit set either by a broker or the broker’s regulating body. This “maintenance” margin limit may be increased by the broker without prior notice, but often ranges from 30% to 40%, instead of the initial 50% required at the time of purchase.

The SEC spells out a pretty clear message. Margin accounts “can be very risky and they are not suitable for everyone,” the regulator says on its website. Before opening a margin account, the SEC says investors “should fully understand that they can lose more money than they invested” and they may be forced to sell some or all of their securities when falling stock prices reduce the value of their securities.

In volatile markets, the SEC adds, “investors who put up an initial margin payment for a stock may, from time to time, be required to provide additional cash if the price of the stock falls.” Some investors “have been shocked” to learn their brokerage has the right to sell their securities bought on margin—without any notification and potentially at a substantial loss to the investor, the SEC says.

How Does Trading on Margin Work in Futures, Options, and Currencies?

Margin requirements—also called performance bonds—for futures trading are substantially lower than stocks, typically ranging from 3% to 15% of the total contract value. Performance bonds are financial guarantees required of both buyers and sellers of futures to ensure they fulfill contract obligations.

In futures, similar to the case in stocks, you must first post initial margin to open a futures position, and if the margin equity falls below a certain amount, it must be topped up. This is known as the “maintenance margin” level.

Futures margins are set by the exchanges and vary depending on the commodity (market volatility is also a factor). For example, as of June 2018, CME Group WTI crude oil futures require a maintenance margin of about $2,500, or roughly 4% of the total contract value (the contract was trading around $64 a barrel in mid-June 2018, meaning one futures contract covering 1,000 barrels of oil had a notional value of about $64,000).

When used with caution and discipline, leverage can be a valuable tool in a trader’s arsenal, but the warning bears repeating: Margin is a double-edged sword. It can magnify losses as well as gains. If you plan to use margin, make sure you understand the risks, and be sure to regularly monitor your accounts.