Thanks for posting here in the Community, Simon. I'm here to help you fix the issue of why you're unable to copy the text in the body of your tax invoices from QuickBooks Online (QBO).

I replicated this on my end. I tried to send an invoice via Outlook, and I can copy the text of the body of the tax invoice from the mail body and from the attached PDF.

Have you tried clearing the cache or using other supported browsers? The private window will not save any history, making it a good place to identify browser problems. To start incognito mode, use these keyboard shortcuts:

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

If you're able to copy the text using a private browser, go back to your regular browser and clear its cache. Clearing the cache or cookies is the best way to get a clean slate for your browser. Otherwise, using other supported browsers can be a good alternative too.

• Add, customise, or remove logos on sales forms
• Customise invoices, quotes, and sales receipts in QuickBooks Online

I'm all ears if you have other concerns about managing your invoices in QBO. I’ll be more than happy to work with you again. Have a good one!