Landfill site operators who are, or have the intention of, carrying out taxable disposals from 1 April 2018, must register for Landfill Disposals Tax (LDT).
Rhaid i weithredwyr safleoedd tirlenwi sydd, neu sy’n bwriadu, gwneud gwarediadau trethadwy o 1 Ebrill 2018, gofrestru ar gyfer Treth Gwarediadau Tirlenwi (TGT).