Hi julio-rebollar,
To amend this, you'll need to contact our QuickBooks Support Team. They have a specific tool to delete your submitted VAT return.
Here's how to contact them:
- Sign in to your QuickBooks Online (QBO) account.
- Go to Help and click on Contact Us.
- Enter your concern and select Let's talk.
- Choose either Call us or Message an agent.
From there, you'll be able to correct the period date and re-submit the VAT.
I'm linking this article for more tips and guidelines before submitting the VAT return.
Please let me know if you have further questions. I'm always happy to step in and lend a hand. Take care.