A buys a quantity of goods from C in another EU country. It is often small goods of high value, mobile phones for example.
A sells the goods at a lower price to B here in Denmark. As the goods were bought in another EU country, A does not have to pay VAT at the time of purchase - as we follow the VAT receivable procedure - and A totally ‘forgets' the VAT payable in connection with the sale.
A closes down the business, which is often represented by a front man - and when the Danish Tax Agency (Skattestyrelsen) enters the scene, A has no money to be collected.
As it is, B is entitled to deduct VAT on the purchase - unless the Tax Agency is able to prove that B is involved in the fraud.
The result is that the public purse loses VAT income. The goods on which the VAT carousel fraud was based are often heading for yet another ride (or rides) on the carousel, crossing borders on their way. It is not uncommon that a phone rides the carousel three to four times - possibly never even meeting its end user.