Here is how you can calculate how much you will need to add to your trading account to prevent your position from being automatically closed once the margin requirements for CFDs on stocks increase.
The leverage will decrease to 1:2 meaning that the margin requirements will be 50%. That means you will need 50% of the total value of the trade to guarantee your position.
1. Calculate the value of the trade:
Price x Quantity = Value of the trade
2. See how much funds you need to have to cover 50% of the value of the trade:
Value of the trade x 0.5 or Value of trade / 2 = Required margin
3. Check your current margin blocked for the trade:
(Newly required margin as per point 2) - (Current margin blocked for your trade) = The difference you need to add to your account to make sure no positions get closed.
N.B. Increased margin requirements will not affect position result (be that profit or loss)!
This means that the positions will close at the profit or loss that they've already accumulated given that the margin requirements are not met.