There are three options to choose from:

Remove tax before revenue share takes place
Enabling this setting will remove all tax amounts from the total before the calculations and share takes place. This means the store keeps all tax amounts to pay tax authorities. Collaborators do not receive any tax.
Don’t remove tax
Enabling this setting causes tax to be ignored and included in the calculations of the Collaborators. This means tax is shared between the store owner and the Collaborators as if the tax is part of the total prices.
Pay all tax to the collaborator
Enabling this setting will pay all the tax amounts to the Collaborators.
For example, if there is a Collaborator earning 50% from a $10 product, and the product includes 10% exclusive tax ($1), then the Collaborator will earn the full $1 tax amount as well as 50% of the product price which is $5.