The percentage of returns filed within 31 days had been broadly consistent at around 99% from Jan – Apr 2019 with 90% of those returns filed under 14 days in April.
Bu canran y ffurflenni a ffeiliwyd o fewn 31 diwrnod yn eithaf cyson sef rhyw 99% o fis Ionawr – Ebrill 2019 gyda 90% o’r ffurflenni hynny wedi’u ffeilio o dan 14 diwrnod ym mis Ebrill.