Hello there, @GourmetGG.

The VAT return should only show all your sales that are taxable excluding the VAT amount. To check if you’re having the right figures, you might want to run the VAT Detail Report and the transactions involved. 

Though if the amount is incorrect, you can click the Adjust link next to Box 6 in your VAT return. Just enter the exact amount that needs to be added or deducted (enter a negative amount if it’s a deduction) on the Adjustment amount field. Enter the Adjustment date and Reason then click Save. 

Drop by again if you need anything else.