If you define a fiscal position for the customer, that will determine the tax rates to be used on their sales order(s).

For example, that can apply sales tax by US states.

Have you tried that?

Thank you for all your help.  Now I had solved..  I delete taxes of product due to I have many different taxes for customers and I informed customers field, but this was wrong.  I need to have a product with taxes and only then the system showthem at the SOrder. .... Thank you anyway!!

Hi,

1. Go to Sale-> Orders-> Customers-> sale& purchase tab-> Add fiscal position

2. Accounting-> configuration-> Fiscal position

Create fiscal position with required tax -> save

For more details, refer to the blog:

https://www.cybrosys.com/blog/overview-of-fiscal-positions-countries-in-odoo-16-accounting

Hope it helps