The tax rate object in the API tax_behavior object in Stripe Tax allow you to specify whether the tax rate is inclusive or exclusive.

Inclusive tax is part of the price. For example, if the price is €600 and you set an inclusive tax rate of 10%, the invoice total will still be €600.

Exclusive tax is applied on top of the price. An exclusive tax rate of 10% on a €600 price will result in an invoice total of €660.