Auction Theme – TAX 15% appear on invoice

Hi,

Is it possible to get a ‘sub total’ of Less 15% of the total cost.

Example:
>Customer will list an item for $10.00
>$10.00 minus 15% is $1.50
> Invoice will then have a sub total of $1.50 printed

>>It Doesn’t matter where this less 15% subtotal is displayed on the invoice, just as long as its printed on the invoice<<

[would be nice to have this subtotal of $1.50 next to the total cost somewhere]

Thank you

Keegan