Is the Xolo Go fee applied to the amount with or without VAT?

Xolo Go fee of 5,9% is applied on the net sum i.e. without VAT.

For instance, if you issue an invoice in the amount of €100 to your VAT-paying customer, the invoice total amount will be €124. When you receive €100 + 24% VAT = €124 from your customer, the VAT (which has to be paid to the authorities) gets deducted, and it will be paid to the tax authorities by Xolo. You will receive €100 - 5,9% = €94,1 to your personal bank account.