You can whistleblow to us about Land Transaction Tax or Landfill Disposals Tax if you’ve reason to believe that one of the following has happened:
Gallwch chwythu’r chwiban wrthym am Dreth Trafodiadau Tir neu Dreth Gwarediadau Tirlenwi os oes gennych reswm i gredu bod un o'r canlynol wedi digwydd: