=item tax - percentage
+=item taxclass
+
+=item exempt_amount
+
=back
=head1 METHODS
sub check {
my $self = shift;
+ $self->amount(0) unless $self->amount;
+
$self->ut_numbern('taxnum')
|| $self->ut_textn('state')
|| $self->ut_textn('county')
|| $self->ut_text('country')
|| $self->ut_float('tax')
+ || $self->ut_textn('taxclass') # ...
+ || $self->ut_money('amount')
;
}