The 'Are you sales tax registered?' section of the Portal is only required for clients based in the UK who are VAT registered. Please note that the entity you are VAT registered with must match your AWAL client name in order for us to set up your account for Self Billing.
As a non-UK based AWAL member, you may have withholding tax (WHT) deducted from your account balance. If this happens it will be shown on your statement. Please see our article about withholding tax for more details.