This is via Twitter - I'm yet to see it elsewhere.

  • China may raise the stamp tax on stock trading to boost fiscal revenue as recent market volume keeps surging, Securities Times

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Note - there were similar rumours a few weeks ago, which were denied by the China Securities Regulatory Commission (CSRC) at the time:

  • Rumour: China will use stock trading stamp taxes to cool market
  • China CSRC : Online rumour of raising of stamp tax is untrue