I have some tax code letters from HMRC to change over for my Go Live month, do I need to give these to you?

No, we have the HMRC link which will feed through tax codes automatically, for the Go Live month, provided you have correctly set up the HMRC link. However, it is important to check the HMRC portal for any tax code updates which could have been missed by the end of your previous payroll provider and the start of your Go Live (Please check this through your HMRC portal). It will then be your prerogative to update these manually on the system if required.