+=item tax
+
+Returns the tax amount (see L<FS::cust_bill_pkg>) for this invoice.
+
+=cut
+
+sub tax {
+ my $self = shift;
+ my $total = 0;
+ my @taxlines = qsearch( 'cust_bill_pkg', { 'invnum' => $self->invnum ,
+ 'pkgnum' => 0 } );
+ foreach (@taxlines) { $total += $_->setup; }
+ $total;
+}
+