How do you post a diesel refund against VAT payable?

Good day, brahman.

This option is currently unavailable in QuickBooks Online. The program will automatically offset the Vat on purchase against the collected VAT on sales so you don't have to manually reclaim taxes. 

You can also reach out to our Email Support Team so they can discuss this further with you. Here's how: 

1. Click the Help menu and click Contact Us.
2. Paste your question in the description box and click Let's talk.
3. Click on Start an email.

The Community is always here if you have other questions.