Vat drop box not working in sales invoicing. There is nothing to select in drop box but there was before.

I can help you sort this out, @aw-flooring.

The stored data in your browser may result in unexpected behaviours. Let's access your account using a private or incognito browser to isolate this concern. 

Here's are the keyboard shortcut keys you can use:

• Google Chrome: press Ctrl + Shift + N
• Mozilla Firefox: press Ctrl + Shift + P
• Internet Explorer: press Ctrl + Shift + P 
• Safari: press Command + Shift + N 

Once you've signed to your account, let's try creating an invoice. If the VAT drop-down works,  you may need to clear the cache of the regular browser you're using. Also, you can use other supported, up-to-date browsers like Google Chrome, Internet Explorer or Mozilla Firefox to be thorough.

You can leave a comment below if you have other questions navigating around QuickBooks and applying VAT. I'm just a few posts away.