Questão jurídica principal
Whether the VAT back assessment for missing input tax vouchers was lawful.
Decisão extraída
Yes. The taxpayer had to prove deductible input tax by vouchers and breached his duty to keep and retain records; the back assessment was therefore justified.
Fundamentação extraída
Under the VAT ordinance, input tax deduction requires documentary proof and proper bookkeeping/retention for six years. The loss of records was attributable to the taxpayer's own negligence, not to later difficulties in obtaining copies from suppliers.