Jason Roy was fined two demerit points and 30 per cent of his fee by ICC match referee Ranjan Madugalle after reacting badly to being given out by Kumar Dhamasena, caught behind down the leg side off Pat Cummins for 85.
Roy initially asked for a review, and replays showed he hadn't touched the ball, but he had to leave the field after it was pointed out to him that Jonny Bairstow had already used up England's challenge.
The fine for dissent takes him to three demerit points for this World Cup following an earlier incident against Pakistan
, but a ban kicks in only after a player reaches a total of four.
The Surrey batsman made his case to the referee but was eventually told to leave the field and news of his fine emerged following the eight-wicket win which sealed a spot in Sunday's World Cup final at Lord's.
Roy impressed with 85 as an opener and his innings ensured England's pursuit of Australia's 223 runs was rarely ever in danger.
Replays showed the England batsman had every right to feel aggrieved. But in the grand scheme of things, his dismissal proved no harm to England as it would prove to be their last.
Joe Root and Eoin Morgan continued to collect runs and find boundaries on a consistent basis as Australia's bowlers wilted at Edgbaston.
Neither England or final opponents New Zealand have ever won the Cricket World Cup and so Sunday's showpiece at Lord's will see a new champion crowned.