How do you calculate tax in Virtual Terminal?

The  total (including tax) goes into the 'amount' field and the tax amount only goes into the 'Tax' field.  See example below:

Ex: If the merchant wants to charge $13.06 for a sale (total with tax)

$13.06 would be put in the 'Amount' field (total plus tax)

1.06 would be put in the 'Tax' field (tax only)