When matching bills sometimes the VAT amount on an invoice has some items as standard rated and some as zero rated. Dext correctly works out the total VAT element but doesn't let you publish as 'extracted amount' like it does when working with Quickbooks. It has the error message Complete the Tax field for all line items and make sure their total amount matches the one of the item.' We are forced to use a fix VAT rate (I have temporarily created a mixed rate VAT rate of 10%).

So rather than using line items (which come at an unnecessary extra cost), you should be able to leave this as 'extracted rate' which will use the standard rated choice as the VAT code but manually override the VAT amount. Zoho Books does allow you to do this directly within the the software, so at the moment I'm having to manually adjust the bills in Zoho once they have been submitted with the incorrect VAT amount from Dext.