It was Flanders' financial daily De Tijd that broke the news.
Antwerp public prosecutors allege that KPMG was involved in the sale of a German company to a British telecom group. The sale went via Belgium because no tax is due here on the sale of shares.
In this way the German firm was able to evade paying 9 million euros' worth of tax.
A Belgian judge will now decide whether KPMG and a Belgian solicitor will have to face charges in court. In the meantime the German businessmen have already reached a settlement with the German taxman and the German judicial authorities.