Mae CThEM wedi rhoi gwybod i Lywodraeth Cymru am wall sydd wedi digwydd wrth roi’r codau newydd ar waith ar gyfer nifer o gyflogwyr, gan gynnwys rhai o adrannau ac asiantaethau llywodraeth y Deyrnas Unedig. Mae hynny wedi golygu bod rhai trethdalwyr sy’n byw yng Nghymru wedi derbyn cod ‘S’ yr Alban ac felly wedi talu cyfraddau treth incwm yr Alban ym mis Ebrill. Nid yw CThEM yn gallu cadarnhau maint llawn y gwall ar hyn o bryd, na dweud ar faint o drethdalwyr y mae hyn wedi effeithio. Fodd bynnag, o ran y sefydliadau yr ydym yn gwybod amdanynt, bydd y trethdalwyr wedi talu ychydig yn fwy neu ychydig yn llai o dreth. Lle bo trethdalwyr wedi talu rhy ychydig o dreth (neu wedi cael eu gordalu), ni fydd hyn yn fwy na £2 fel arfer. Lle bo trethdalwyr wedi talu gormod o dreth (neu heb dderbyn swm digonol), ni fydd hynny’n fwy na £10. Mewn rhai achosion, bydd trethdalwyr wedi talu’r swm cywir o dreth er eu bod wedi cael cod ‘S’.
HMRC has alerted the Welsh Government to an error that has occurred in the application of the new codes for a number of employers, including some UK government departments and agencies. This has meant that some taxpayers living in Wales have received a Scottish ‘S’ code and, as a result, have paid Scottish rates of income tax in April. HMRC is unable to confirm the full extent of the error at this time or the total number of taxpayers affected. However, for those organisations we know have been affected, taxpayers will have over or underpaid tax by relatively small amounts only.Typically, where taxpayers have underpaid tax (or have been overpaid) this will have been by no more than £2. Where taxpayers have overpaid tax (or have been underpaid) this will have been by no more than £10. In some cases taxpayers will have paid the correct amount of tax despite being assigned a ‘S’ code.