How to Calculate an Initial Margin Requirement

Each type of investment has a different initial margin requirement.
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Margin trading can take your regular investment strategies up to the next level. They can also take your potential losses to the next level. Working on leverage, they entail borrowing some of the money to stake your initial claim from your broker. You still must pay the rest of the cash back if your trade goes belly up, plus interest. The Securities and Exchange Commission and Financial Industry Regulatory Authority, Inc. set margin requirements, which differ by security and strategy.

Step 1

Start with the minimum margin requirement. FINRA and all securities exchanges require you to deposit $2,000 or 100 percent of the purchase price of the securities in your account before your broker will grant margin trading privileges. Day traders' minimum deposit is $25,000.

Step 2

Multiply the purchase price of equity investments by the standard 50 percent initial margin requirement. If your initial investment is more than $4,000, you'll need to add to the minimum margin deposit. If you buy $10,000 worth of Apple on margin, your broker will need at least $5,000 in your account. Each broker can require a higher minimum margin than FINRA rules, and the exact requirements will be stated on your margin account agreement.

Step 3

Invest in options and you'll need to do more calculations. Long (buy) contracts with more than 9 months to the exercise date require a 75 percent margin on the value of underlying securities. Short (sell) options contracts require 20 percent of the underlying index value for narrow equity (single sector) indexes and 15 percent of the underlying value for broad-based equities like S&P500 or Wilshire 5,000. Out-of-the-money-options, which would produce a loss if exercised at current market levels, require the full cost of the option contract plus 10 percent of the current value of the underlying securities.

Step 4

Check with the broker and exchange if you're trading commodities and futures. These margins are specific dollar amounts per contract, rather than a percentage of the futures contract price or underlying security value. As of 2012, soybean futures have a margin of $5,062 per contract, while gold futures contracts are $9,112 per contract, even though the underlying asset values fluctuate constantly.

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