Support for 0% Tax + Conditional Invoice Notes (based on Client Location)

Allow creation of 0% tax rates for handling reverse charge scenarios.

In addition, enable users to attach a custom note to each tax type. This note should be displayed on the invoice only when that specific tax is applied.

This helps automate invoice creation based on client location, especially for businesses that operate across borders and must comply with country-specific tax rules (e.g., 17% local tax vs. 0% reverse charge).