I just realised that all the Royal Mail postage claims I have made in the past for tracked services have been flagged as non vatable, when in fact they are all vatable. I can easily workout the amount of additional VAT I need to claim in the next submission. However, I do I account for this now that all the previous invoices tied to historical submissions have been locked?
The slightly facetious response would be “if the receipt/invoice says so”. Ultimately that’s what matters - if you don’t have a VAT invoice or receipt that shows the VAT then by definition there’s no VAT you can claim.