What's Stamp Duty?

Stamp Duty AKA Stamp Duty Reserve Tax (SDRT) is a tax the UK government applies to the purchase of certain assets, including stocks.
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You'll pay 0.5% stamp duty of the value of the purchase (but not the sale) of UK stocks. But you won’t pay it  on UK-listed ETFs, stocks listed on the AIM or  US exchanges and other non-UK assets.