In the settings of their account, users can define the default tax rate that applies by default to all customers of their organization. This tax rate can then be overwritten at the customer level.
Whether set at the organization level or the customer level, so far the tax rate used to calculate fees was simply indicated as "Tax" on invoices.
To give users more flexibility, we've added the option to create several tax objects, which can then be assigned to the organization or specific customers (e.g. state sales tax, VAT, reverse charge, GST, etc.).