Bydd modd i CThEM gynnal proses wirio gynhwysfawr ddechrau mis Mehefin, a bydd asesiad llawn o faint y broblem yn cael ei gynnal bryd hynny. Lle bo anghysondeb rhwng y cod ‘C’ cywir a roddwyd gan CThEM a’r cod a ddefnyddiwyd gan y cyflogwr, bydd CThEM yn ail-roi’r cod treth i’r cyflogwr. Bydd ail broses wirio yn cael ei chynnal ym mis Medi i helpu i atal unrhyw wallau parhaus wrth ddyrannu codau ‘C.’
HMRC will be able to undertake a comprehensive check in early June at which point an assessment of the full extent of the issue will be made. Where there is a discrepancy between the correct ‘C’ code issued by HMRC and the code applied by the employer, the tax code will be re-issued by HMRC to the employer. A second check will take place in September to help prevent any persistent errors in ‘C’ code allocation.