Download VAT100 Return Spreadsheet   Download VAT100 Return Spreadsheet Always download and read the instructions before you populate your data into the spreadsheet.   Instruction for VAT100 Return Spreadsheet VAT100 Return Spreadsheet document   Once downloaded, you should enter your data into the Spreadsheet and save it in a CSV format. Then select Upload CSV Data from the Tasking Zone to save the spreadsheet back to our server in a CSV format ready for eFiling