The Community has you covered, @modelec.
Let's make sure that the VAT is set up on purchases. Here's how:
For more details, please see this article: Set up and record purchase taxes.
Also, to have a summary of info for each box on the VAT return, you may pull up the VAT Summary Report. Let me walk you through the process:
You can always get back here if you have other concerns or questions about VAT on purchases in QBO. I'll be here to help you. Stay safe.