Greetings, intheblack.
Thanks for joining the Online Community. It's my priority that you receive the best assistance for deleting the unsubmitted VAT return.
The opening of a customer's account requires personal verification, and for security reasons, we’re unable to gather them here in the Community. For this reason, I recommend calling our QuickBooks Online Support Team, since they have tools to help you remove the tax form in your account.
You can reach them through the following link:
- In your browser, enter this link: https://quickbooks.intuit.com/uk/contact/.
- On the Contact QuickBooks page, go to the Help and Support section.
- Choose QuickBooks Online to see the phone number.
There you go. You should now be able to create a new VAT return with different dates.
For future reference, I'm attaching an article that will help you record and process a VAT refund: Tax payment.
If you have additional questions about working in QuickBooks, leave me a comment. I'll right here with you. Wishing you the best.