apply the same level of customer service, support and transparency to Welsh income taxpayers, and the employers of Welsh tax payers, as applied to income taxpayers in the rest of the UK
rhoi’r un lefel o wasanaeth cwsmeriaid, cymorth a thryloywder i dalwyr treth incwm Cymru, a chyflogwyr trethdalwyr Cymreig, ag a roddir i dalwyr treth incwm yng ngweddill y DU