"(1) The right to deduct shall arise at the time when the deductible tax becomes chargeable. (2) In so far as the goods and services are used for the purpose of his taxable transactions, the taxable person shall be entitled to deduct from the tax which he is liable to pay: (a) value added tax due or paid within the territory of the country in respect of goods or services supplied or to be supplied to him by another taxable person; …"
"(1) To exercise his right of deduction a taxable person must: (a) in respect of deductions pursuant to Article 17(2)(a), hold an invoice drawn up in accordance with Article 22(3); … (2) The taxable person shall effect the deduction by subtracting from the total amount of tax due for a given tax period the total amount of the tax in respect of which, during the same period, the right to deduct has arisen and can be exercised under the provisions of paragraph 1. … (3) Member States shall determine the conditions and procedures whereby a taxable person may be authorised to make a deduction which he has not made in accordance with the provisions of paragraphs 1 and 2. … (4) Where for a given tax period the amount of authorised deductions exceeds the amount of tax due, the Member States may either make a refund or carry the excess forward to the following period according to conditions which they shall determine. …"
"Every taxable person shall submit a return by a deadline to be determined by Member States …"
"Where a person has … paid an amount to the Commissioners by way of VAT which was not due to them, they shall be liable to repay the amount to them."
"The Commissioners shall not be liable, on a claim made under this section, to repay any amount paid to them more than three years before the making of the claim."
"(1) Subject to paragraphs (1A) and (2) below, and save as the Commissioners may otherwise allow or direct either generally or specially, a person claiming deduction of input tax shall do so on a return made by him for the prescribed accounting period in which the VAT became chargeable. (1A) The Commissioners shall not allow or direct a person to make any claim for deduction of input tax in terms such that the deduction would fall to be claimed more than 3 years after the date by which the return for the prescribed accounting period in which the VAT became chargeable is required to be made."
"15. … While we accept that recovery of excessive output tax collected in breach of European law is different in principle from the claiming of input tax for the first time, where the taxpayer is claiming back his own money which has in effect been the subject of an interest-free loan to the tax authority, in Marks and Spencer the European Court has approved a three year time limit for the recovery of excessive output tax collected in breach of European law in the interests of legal certainty, protecting both the taxpayer and the administration. In this case, in the periods under appeal there is one overpayment of output tax, to which the court’s reasoning applies, and six failures to reclaim input tax, to which it does not directly apply. It seems to us that the principle of legal certainty applies just as much to protect the tax authority from late claims for input tax. The right to reclaim input tax applies without qualification to the initial period in which it is incurred. The taxpayer has a continuing right during the next three years subject to conditions which article 18 of the Sixth Directive requires a state to determine, and so during that period there is nothing to render virtually impossible or excessively difficult the exercise of the rights conferred by Community law. After three years with a tax based on three monthly periods, it is reasonable for there to be a time limit even though the effect of it is to prevent recovery of the taxpayer’s own money. While the court said nothing about the position on the late recovery of input tax we do not think that the position in this respect is any different. If the court has approved a three year cap on the repayment of tax collected from customers contrary to European law, there is no reason in principle why the cap should not apply to the taxpayer’s failure to [make] a claim which it was entitled to make three years earlier; if anything, the former case is the greater restriction on the taxpayer’s rights in European law. The interests of legal certainty require that finality should be achieved. Following Marks and Spencer we do not consider that there [is] any doubt about this to warrant a reference to the European Court. 16. On the facts of this case, the failure to recover the input tax could have been discovered at any earlier time if the same investigation had been made earlier. The retrospectivity issue in Marks and Spencer is not applicable here since all the periods in issue are after imposition of the three-year cap; the claim was made 4½ years after the introduction of the cap."
"… national legislation curtailing the period within which recovery may be sought of sums charged in breach of Community law is, subject to certain conditions, compatible with Community law. …[T]he time set for its application must be sufficient to ensure that the right to repayment is effective. In that connection, the court has held that legislation which is not in fact retrospective in scope complies with that condition. It is plain, however, that that condition is not satisfied by national legislation such as that at issue in the main proceedings which reduces from six to three years the period within which repayment may be sought of VAT wrongly paid, by providing that the new time limit is to apply immediately to all claims made after the date of enactment of that legislation and to claims made between that date and an earlier date, being that of the entry into force of the legislation, as well as to claims for repayment made before the date of entry into force which are still pending on that date. Whilst national legislation reducing the period within which repayment of sums collected in breach of Community law may be sought is not incompatible with the principle of effectiveness, it is subject to the condition not only that the new limitation period is reasonable but also that the new legislation includes transitional arrangements allowing an adequate period after the enactment of the legislation for lodging the claims for repayments which persons were entitled to submit under the original legislation. … In that connection it should be noted that member states are required as a matter of principle to repay taxes collected in breach of Community law … and whilst the court has acknowledged that, by way of exception to that principle, fixing a reasonable period for claiming repayment is compatible with Community law, that is in the interests of legal certainty, …"
"Every natural or legal person is entitled to the peaceful enjoyment of his possessions. No-one shall be deprived of his possessions except in the public interest and subject to the conditions provided for by law and by the general principles of international law. The preceding provisions shall not, however, in any way impair the right of a State to enforce such laws as it deem necessary … to secure the payment of taxes or other contributions or penalties."