Not unless they make it retrospective, which is highly doubtful.
It would be retrospective in the sense of the legislation, when it is eventually passed, being backdated to the date of the announcement (or at least that's what normally happens for such cuts).
There's no logic in backdating it to before they even announced it - if your transaction is done and dusted, it obviously didn't need some sort of tax incentive.
If it makes you feel any better, this smash and grab to take money off low and middle income people and shower it onto the rich is probably going to cost us all £2500, and the rest.
Sounds like I moved in on the wrong day and cost me £2500
That's one way of looking at it. Another way is that had you not exchanged when this announcement came through, the chain might have collapsed. All it takes is someone in the chain to get greedy or silly over stamp duty. I expect the cost and inconvenience would exceed £2500 if that happened.
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There's no logic in backdating it to before they even announced it - if your transaction is done and dusted, it obviously didn't need some sort of tax incentive.