($netamount, $taxamount) = Form->calculate_tax($params{amount}, $tax->rate, $self->taxincluded, $roundplaces);
};
next unless $netamount; # netamount mustn't be zero
($netamount, $taxamount) = Form->calculate_tax($params{amount}, $tax->rate, $self->taxincluded, $roundplaces);
};
next unless $netamount; # netamount mustn't be zero