In order to exercise the right of deduction, a taxable person must meet the following conditions:
for the purposes of deductions pursuant to Article 168(a), in respect of the supply of goods or services, he must hold an invoice drawn up in accordance with Articles 220 to 236 and Articles 238, 239 and 240;
for the purposes of deductions pursuant to Article 168(b), in respect of transactions treated as the supply of goods or services, he must comply with the formalities as laid down by each Member State;
for the purposes of deductions pursuant to Article 168(c), in respect of the intra-Community acquisition of goods, he must set out in the VAT return provided for in Article 250 all the information needed for the amount of the VAT due on his intra-Community acquisitions of goods to be calculated and he must hold an invoice drawn up in accordance with Articles 220 to 236;
for the purposes of deductions pursuant to Article 168(d), in respect of transactions treated as intra-Community acquisitions of goods, he must complete the formalities as laid down by each Member State;
for the purposes of deductions pursuant to Article 168(e), in respect of the importation of goods, he must hold an import document specifying him as consignee or importer, and stating the amount of VAT due or enabling that amount to be calculated;
when required to pay VAT as a customer where Articles 194 to 197 or Article 199 apply, he must comply with the formalities as laid down by each Member State.
The taxable person shall make the deduction by subtracting from the total amount of VAT due for a given tax period the total amount of VAT in respect of which, during the same period, the right of deduction has arisen and is exercised in accordance with Article 178.
However, Member States may require that taxable persons who carry out occasional transactions, as defined in Article 12, exercise their right of deduction only at the time of supply.
Member States may authorise a taxable person to make a deduction which he has not made in accordance with Articles 178 and 179.
Member States may authorise a taxable person who does not hold an invoice drawn up in accordance with Articles 220 to 236 to make the deduction referred to in Article 168(c) in respect of his intra-Community acquisitions of goods.
Member States shall determine the conditions and detailed rules for applying Articles 180 and 181.
Where, for a given tax period, the amount of deductions exceeds the amount of VAT due, the Member States may, in accordance with conditions which they shall determine, either make a refund or carry the excess forward to the following period.
However, Member States may refuse to refund or carry forward if the amount of the excess is insignificant.