QB Issue Resolution:

You can change the Start and End date of the return period. However, you can file your VAT return on or a day after your end date.

 

You can also certainly file a shorter period for your VAT. To do so, you would click on Submit Return within the Taxes tab and change the End Date to the desired date for your shorter filing.

 

For further insights, you may check this article: Submit a VAT return in QuickBooks.

 

Resolution for Issue 'Can you submit a VAT return before the end date? My end date is 31/07 and I was trying to submit today 28/07 but it wont let me submit' available: Yes (Solved).
Source: Intuit Community forum.

Can you submit a VAT return before the end date? My end date is 31/07 and I was trying to submit today 28/07 but it wont let me submit: this issue or error code is a known issue in Quickbooks Online (QBO) and/or Quickbooks. Support for this issue is available either by self-service or paid support options. Experts are available to resolve your Quickbooks issue to ensure minimal downtime and continue running your business. First try to resolve the issue yourself by looking for a resolution described below. If it is a complex issue or you are unable to solve the issue, you may contact us by clicking here or by using other support options.

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