Tying to submit VAT return, period ending 30/11, today 26/11. When select 'Submit to HMRC' button, I get an error message 'Select an end date which is not in the future'?

Hello there, marcjwalter.

In QuickBooks, filing a VAT return should be within the filing period. The option to select a future date is not possible. You'll have to wait till the period ending date to file

You can check this article to know more: Submit a VAT return.

I'll be right here to help you if you have other concerns.