Customers of the taxpayer, which operated bingo clubs, paid a fee entitling the customer to take part in a number of games of bingo, forming a session, and to receives a book of cards. Each of which could be used for one of the games. Although commercial gambling was not governed by specific VAT provisions, the jurisprudence had recognized (para. 9): “It is … only the net sum retained by the promoter after deduction of winnings which may be included in the taxable amount for VAT purposes.” As funds used to top up the prize money did not reduce the taxable turnover, the taxable turnover was lower if participation fees were calculated on a session by session basis, rather than a game by game basis.
HMRC issued a “business brief” stating that bingo promoters who (like the taxpayer) had been calculating participation fees on a game-by-game rather than session-by-session basis, could make a claim for having overpaid VAT, which the taxpayer did. However, it was precluded by statute from going back more than three years with its refund claims. However, pursuant to article 90 of the Principal VAT Directive, there was no such time limitation where a repayment of VAT was claimed based on there being “a decrease in consideration for a supply.” The taxpayer unsuccessfully argued that where there had been a change from one method of calculating the consideration for its supplies (the game by game basis) to another method (the session by session basis), thereby producing a lower taxable amount, the adoption of the new method involved a “decrease in consideration.” Lord Legatt stated (at para. 48):
What is required … is a change in the consideration actually received by the supplier. … All that has happened is that the taxpayer has had second thoughts about how the consideration received at the time of the supply should be analysed for tax purposes.
Before so concluding, he noted (at para. 30) that it was “clear that there can be only one correct method of calculating the taxable element of fees charged to customers for playing cash bingo and … this was the session by session method and not the game by game method.” Since there was only one correct method, on this basis as well the taxpayer’s claim that its switch in method entailed a decrease in the consideration payable by it foundered.