Can I revise the word 'Tax Inovice' on the PDF invoice file? I'd like to revise it to 'Invoice'

Thanks for visiting the Community today, @rachel-kim-netki. Yes, you can edit the title in the invoice template. I'd be delighted to show you how: 

1. Go to the Settings menu, then select Custom form styles under Your Company. 
2. Select the invoice template you want to modify. 
3. Go to the Content tab, then select the Pencil icon in the Header (first section) to edit the form name. 
4. Enter the word "Invoice" in the Form names field. 
5. Click Done when finished. 

You'll also want to design your custom form style the way you want it to. Read through this article to learn some more tricks on how to do it: Import custom form styles for invoices or estimates. 

Let me know if you need more help with anything else about QuickBooks. We're always around here to guide.