You don't have to set it up, David Rodney. You can change the dates when you prepare the VAT return.
Let me guide you with the steps:
- Click Taxes.
- Go to the VAT tab.
- Select the VAT form, then click Prepare return.
- Change the Start date and End date to ensure the period is correct.
- Make sure the Submission date is correct as well.
- Click either File online with HMRC or Mark as Filed.
I'll include this reference to help you with filing the sales form: Submit a VAT return in QuickBooks Online.
Get back to this thread if you have additional questions. We'll reply to you as soon as we can. Keep safe!