Thank you JonpriL, I am glad to learn it is a software issue and not an error of mine. I have taken the suggestion of using Gross CIS as the product code for CIS materials until QB have fixed this situation, but this poses new issues. If you are raising an inv with CIS labour and materials lines, once you select gross for the materials it takes out the CIS deduction for labour. So still not a great solution for my client. I have told him that, until QB resolves the situation, he will need to raise separate invoices for cis labour and materials. Thank you for your quick response to my query yesterday, I will keep an eye out for updates from QB to say they have fixed the issue.