Hi @krogowski! Taxes are managed using the Symmetry Tax Engine, not related to Aatrix. Symmetry does periodic updates which don’t coincide with Acumatica updates, meaning that to get the newest tax updates it will not require updating to a newer Acumatica build.
What Aatrix is used for is the reporting aspect and you will need an Aatrix account to log from Acumatica.
The screen to navigate to is called Government Reporting.
Be sure that you have at least one Work Location (complete address) entered before performing the Tax Maintenance to pull in the Taxes.
Depending upon the state and location, you will also want to run the Tax Maintenance after new employee payroll records with complete addresses are added.