Thank you for posting here in the Community, @MECH Scan Solutions.
I appreciate making QuickBooks as your partner in business. As for now, importing invoice with sales tax is not available in QuickBooks Online, that is why you keep getting the error message. You can use a third-party application that supports importing invoices with sales tax.
However, if you wanted to import an invoice without sales tax, you need to turn off the automated sales tax so you’ll be able to import your invoices without having an error.
Here’s how.
- Go to Taxes.
- Select Sales Tax Settings.
- Click Turn off sales tax.
If you wanted to know how to import multiple invoices, you can check out this article so you will be guided how. Import multiple invoices at once.
Feel free to fill me in if you have any other questions. Take care and keep safe.