Why does the tax amount change when I modify the shipping address on the Transaction screen?

Overview

You want to know how to change the shipping address on the Transaction screen without impacting the calculated tax amount.

AvaTax for QuickBooks Online

You should not modify transaction addresses. However, if you must modify an address, do the following:

Use the exact Customer name, Company name, and Display name that you received from the QuickBooks Online customer card.
Add the Customer name, Company name, and Display name before the address lines.
Use a line break after address line 1.
Use one of the following formats for address line 2:
- City<space>StateCode(two characters)<space>ZipCode<space>CountryCode
  This must be all on one line. For example, Raleigh NC 27606 USA.
- ZipCode<space>CountryCode
  For example, 27606 USA.
Use one of the following formats for country code:
- us
- usa
- US
- USA
- United States