We have our catalogue set up so that prices entered in the admin include tax, for example:
£75.00 (excl tax: £62.50)
During the checkout we also allow people to enter their VAT number which removes tax from the totals.
Customer pays £62.50
Customer pays £75.00 still (but tax is considered £0.00)
The only way around this that I can think of is that catalog prices are entered excluding tax. Is there any way this can be done with catalog prices including tax?