How do I add the VAT/Tax to my paypal checkout total

[sandstorm]

I have a site that charges 17.5% VAT / TAX, all through the checkout process the tax is in place.

As soon as I hit pay with paypal, the product total is in the PayPal screen minus the tax/VAT.

How do I get this to add to the paypal total too?

Any help appreciated - Yep Im fairly new to using Virtuemart

Thanks, Andy