Currently on Zoho if you invoice for a project with itemised items you have to go through every item and change the dropdown to include VAT, this can be annoying when you have 20+ itemised items on the invoice, if you're VAT registered in the UK you charge VAT on eveything, there are only a few items that are VAT exempt, so it would make more sense for the default to be VAT charged and the drop down to be VAT exempt.