How do I amend a vat return already submitted

Thanks for reaching out to the Community, @hello107.

As much as I would love to take care of this, we're unable to pull up your account here in the Community space for the security of your account. 

That said, I highly recommend contacting our Customer Support team so you can submit a request to have that specific VAT return unfiled for you to amend. 

To reach them, here's how:   

1. Go to the Help icon on the top right.
2. Click Contact Us button at the bottom.
3. Enter a short description about your concern.
4. Hit on Let's talk.
5. Choose the method on how you'd be connected to support.

Additionally, to learn more about submitting VAT return, you can consider checking this article for guidance: Submit a VAT return in QuickBooks Online.

If there's anything else you need help with, let me know by commenting below. I'm here to help. Have a great day!