Gofynnodd Anhysbys gwestiwn i Customer Services
Because I’m Muslim, it’s not permissible for me to have any type of dealings with interest, so this could be even writing an amount down which is owed which involves interest or even taking an interest payment charge/fee.
Given the nature of how the tax system works, interest is an integral part of most compliance or customer service roles. Anyone working in those roles would need to deal with late payment and repayment interest when it arises. I don't think it would be considered a reasonable adjustment not to have to deal with interest in those roles, given the frequency and unpredictability of when it would arise. I'm aware that many Muslim colleagues work in such roles and, presumably, deal with interest. However, if your personal faith means that you can't do that, there are roles in HMRC that don't involve dealing with interest. I'd suggest having a conversation with your manager to explain the issue and explore a move that would meet your needs.
Depending on the role you work in you may not have to handle interest at all. I'd recommend checking through what is entailed in the description of any job you apply for first and at the bottom of the application form there is also usually an email address for the person advertising the role. You could always see if you can contact them to gain a little more understanding of what you would be expected to do in the role.

Mae’r wefan hon yn defnyddio cwcis.
Rydym yn defnyddio cwcis i bersonoli cynnwys fel argymhellion swyddi, ac i ddadansoddi ein traffig. Rydych yn cydsynio i’n cwcis os ydych yn clicio "Rwy’n Derbyn". Os byddwch yn clicio ar "Nid wyf yn derbyn", yna ni fyddwn yn defnyddio cwcis ond efallai y bydd gennych brofiad defnyddiwr dirywio. Gallwch newid eich gosodiadau trwy glicio ar y cysylltiad Gosodiadau ar frig y ddyfais
Mae’r cwcis hyn yn angenrheidiol er mwyn i’r wefan weithredu ac ni ellir eu diffodd yn ein systemau. Fel arfer, dim ond mewn ymateb i gamau a wnaed gennych sy’n gyfystyr â chais am wasanaethau, megis gosod eich dewisiadau preifatrwydd, mewngofnodi neu lenwi ffurflenni. Gallwch osod eich porwr i’ch rhwystro neu eich rhybuddio am y cwcis hyn, ond ni fydd rhai rhannau o’r wefan yn gweithio wedyn.
Mae’r cwcis hyn yn ein galluogi i gyfrif ymweliadau a ffynonellau traffig fel y gallwn fesur a gwella perfformiad ein gwefan. Maen nhw’n ein helpu ni i wybod pa dudalennau sydd fwyaf a lleiaf poblogaidd a gweld sut mae ymwelwyr yn symud o gwmpas y wefan. Os na fyddwch yn caniatáu’r cwcis hyn, ni fyddwn yn gwybod pryd rydych wedi ymweld â’n gwefan, ac ni fyddwn yn gallu monitro ei berfformiad.