This was influenced in the main by the high monthly level of reported tax due in March 2021, many of the payments for which were made in April.
Dylanwadwyd ar hyn yn bennaf gan y lefel fisol uchaf erioed o'r dreth a adroddwyd amdani ym mis Mawrth 2021, y gwnaethpwyd llawer o’r taliadau ar ei chyfer ym mis Ebrill.