Margin Trading
With margin trading you can open a position using only a fraction of its full value.
Trading on margin lets you take part in market opportunities without paying the entire value of the asset upfront.
Margin trading uses leverage, which increases both potential returns and risk. Margin is usually expressed as a percentage of the position size and varies by broker and instrument. In Forex a 1% margin is common, meaning a position of $100,000 can be controlled with $1,000 — and losses are calculated on the full $100,000.
Calculating Margin
The margin required for a trade is calculated simply: multiply the trade size by the margin percentage. Then subtract the margin used for all open trades from the equity in your account. The result is the margin you have remaining.
Calculating Margin Example
Example:
Suppose you want to borrow $30,000 to buy a stock that you intend to hold for 10 days, where the margin interest rate is 6% annually.
To work out the cost of borrowing, multiply the amount you want to borrow by the annual rate:
$30,000 x .06 (6%) = $1,800
Divide the result by the number of days in the year. Rather than 365 days, the brokerage sector typically uses 360 days.
$1,800 / 360 = $5
Multiply this daily figure by the number of days you’ve borrowed, or expect to borrow, the money on margin:
5 × 10 = $50
In this case, borrowing $30,000 for 10 days will cost you $50 in margin interest.
Margin can increase gains if the price moves in your favour, but it also increases losses if it moves against you — which can lead to a margin call, requiring you to add funds to cover those losses.
Remember that whether a trade makes or loses money, the margin interest is still owed.
Final Thoughts
Trading on margin is risky and can lead to losses that exceed what you expected if positions are not managed carefully. Avoid over-leveraging, use stop-losses, and always calculate the full borrowing cost so you understand the true cost of a trade and its potential profit or loss before you enter it.