Hi there, willsemail,
Let's isolate this behavior by opening a private window, and check your VAT return from there.
When that works, you can then delete and disable cache and temporary internet files in your regular browser. This will help fix resolve this issue that is caused by too much data stored in the cache.
To do so, please use the links below depending on your browser:
As an alternative, I recommend using other supported browsers to get the best out of your QuickBooks Experienced. Please refer to this article, System requirements for QuickBooks Online, QuickBooks Online Accountant, and QuickBooks Self-Employe... to learn what computer and specs you need to use.
I've added this link, Submit a VAT return to HMRC for instructions and detailed steps.
Let me know how this goes by clicking the Reply button. I'm always right here and happy to help in filing your taxes.
