I currently use an excel spreadsheet to prepare my UK Vat return as I can't work out to set the NAV ( 2017) report date criteria correctly and end up with the wrong VAT amount in my control account. I journal Vat between my general accounts to get the correct amount in my VAT control account. With MTD on the horizon I need to work out how to use NAV properly. Here is an example of what goes wrong with a VAT return end date of 31 March. If I post a purchase invoice with a document date of say 29 March and a posting date of say 5 April, the document is excluded from calc and post but if I extend the end date to 5 April NAV calc and post includes all documents posted to 5 April and included documents dated after 31 March which belong to the next Vat quarter. Can anyone advise me what I am doing wrong ? Many thanks