Hello again, @anubhav868-gmail.
In QuickBooks Online (QBO), when entering an invoice and set Amount are to Exclusive of Tax or Inclusive of Tax, the Subtotal amount will show the total amount of the line items on the AMOUNT column.
However, when the tax is added, the Total and Balance due field will be the sum of the amount on the Subtotal and Tax amounts. Thus, the option not to add the tax computed to the final amount isn't possible.
I understand how the option you're looking for is beneficial to your business. In the meantime, you can visit this link to learn how creating invoices works in QBO.
You may also find these articles helpful in the future:
Please don't hesitate to leave a comment below if there's anything else you need help with. I'm always ready to assist. Take care.
