Taxes work in HIkashop but Paypal adds them again

First of all, thanks for such a great extension for Joomla. I'm very pleased with Hikashop.

I have one problem, though. I have added a tax rate for Belgian customers (21%) and it works fine in the shop, but when I choose the Paypal payment option, Paypal adds another 21% on top of that. Does anyone know of a way around this? I would like to apply the tax in HikaShop itself because I also offer payment by bank transfer, and so then they need to see the total amount to transfer, including tax.

Is it possible to set a taxrate only for a specific payment option? So that people who choose Paypal will not see the tax added in the Webshop, and people choosing bank transfer will?

Thanks.

EDIT: did some Google research and apparently there's an option in Paypal to disable this feature. Since the webshop is using the Paypal account for my company I can't login now to check it. I'll report back next week if I have been able to fix it or not.