Cant submit my vat return

Hello there, russell22.

In this situation, it could be that this unusual behavior might have something to do with a browser issue. With that being said, the browser might be having too much cache that made the QuickBooks feature not responding properly. That's why you can't submit your VAT return.

Below are the things that we can try on to resolve this unexpected behavior. Here's how:

1. Refresh your browser by clicking the Reload icon or pressing F5 on your keyboard.
2. If the same thing happens, we can try logging in to your account through an incognito window. This mode doesn't store cache. That's why we recommend using it.
3. If it works fine, we can clear the cache of your regular browser. This helps remove any browser-related issues and refresh your browser's settings.

Another way is to use other compatible browsers in QuickBooks Online:

• Google Chrome
• Mozilla Firefox. Note: To preview and print forms on Mac OS, you'll also need the Firefox PDF plugin.
• Microsoft Edge
• Safari 11 or newer (Mac only)

Also, you can check this article for more details: Submit a VAT return in QuickBooks Online. 

Know that you can always go back here and post another one below. I'll be around to back you up. Stay safe and have a good one.