Thank you for reaching out on this.
You can change the Sales form name from "Invoice" to "Tax Invoice". Here is an article from our online community for your reference in doing so:
Customize QuickBooks Online forms
Please let us know if you have any follow up questions. Thank you..
You’re right, JayNine. It’s for the online version.
I think Intuit Zac thought that you’re using the QuickBooks Online. In QuickBooks Self-Employed, we’re unable to change the invoice name since the template isn’t customisable.
If you have other questions, just let me know.
Thank you for the feedback. As mentioned by JessT, QuickBooks Self Employed invoices currently state Invoice, instead of Tax Invoice, and this cannot be changed.
We'll pass this on to the Product Team for consideration in future versions of QuickBooks Self Employed.