To find out how much commission is being charged when you buy/sell on Mt4, look at the below pictures.


Desktop:

After you Buy/Sell an instrument/pair you will need to be on the Trade section as shown below, then you will just need to look to your right and you will see how much commission has been taken 



Mobile:

  1. You will need to click on the terminal button as shown below:




2. The you will need to tap on the instrument/pair so you can see how much commission has been taken. 




3. You will see the commission taken on the bottom right side of the instrument/pair in question.