Implementation of the Act commenced on the 1 September 2021, with the new ALN system being phased over a four years up until September 2025.
Dechreuwyd gweithredu'r Ddeddf ar 1 Medi 2021, gan gyflwyno'r system ADY newydd yn raddol dros bedair blynedd hyd at fis Medi 2025.