Commission (in USD) = contract size * base currency price relative to the deposit currency * commission * 2
Known variables:
Commission for Trading Account (TA) is 0.0025% per 1 lot per side;
Commission for Managed Account (MA) is 0.004% per 1 lot per one side.
Important: The commission for an open trade is deducted from both sides at opening.
You can see the commission amount on the website in the section "Trading conditions".
Let's consider an example.
Example 1:
A trader has two accounts in USD - Trading and Managed. On each account, he opens a USD/JPY trade at a price of 105.255 in the amount of 2.5 lots.
Commission for the TA will be calculated in the following way:
Commission = 2.5 * 100,000 * 1 * 0.0025% * 2 = 12.5 USD
The commission for the MA will be calculated in the following way:
Commission = 2.5 * 100 000 * 1 * 0.004 % * 2 = 20 USD
Example 2:
A trader has two accounts in USD - Trading and Managed. On each account, he opens a EUR/USD trade at a price of 1.22760 in the amount of 2.5 lots.
Commission for the TA will be calculated in the following way:
Commission = 2.5 *100 000 * 1.22760 * 0.0025% * 2 = 15.345 USD
The commission for the MA will be calculated in the following way:
Commission = 2.5 * 100 000 *1.22760 * 0.004 % * 2 = 24.552 USD