How can I change the taxable address used on customer’s accounts?

The default address used for tax is based around the invoice's collection method. If you're billing the customer with an automatic collection method, the stored billing information address will be used. For manual invoices, as we do not expect billing info to exist on the account, the account information address is used instead.

We do have an option within the Tax settings page which allows you to change which address is used for automatic invoices. You'll want to click on Configuration on the left-hand navigation menu, then visit the Taxes page. From there, you'll want to click on Tax Settings in the top right-hand corner of the page and check the box labeled as "Use Account Information Address for all Invoices". This feature will change which address is used moving forward when any invoice is billed regardless of collection method or payment type.