Thanks for waiting Sir. Regards to your inquiry, When a constituent share of an index pays out dividend, a dividend adjustment will occur on accounts holding the index at 00:00 GMT+2 of the ex-dividend date.
Dividend adjustments balance entries. Deposit for positive entries (long positions are only positive) and withdrawals for negative entries (short positions always result in a charge).
Example
E.g. Total Dividends for US500 on a day are 0.5$ per index CFD then:
Client position: 10 US500 index CFDs long
Dividend adjustment: 10 x $0.5 = +$5 (+$5 on Account Balance)
Client position: 20 US500 index CFDs short
Dividend adjustment: 20 x (-$0.5) = -$10 (-$10 on Account Balance)