English to Russian Bus/Financial

Объясните пожалуйста, что это означает. Привожу всю фразу из контракта:
Such unusual commercial expences are commissions not mentioned in the main contract or not stemming from a properly concluded contract referring to the main contract, comissions not paid in return for any actual and legitimate service, commissions remitted to a tax haven, commissions paid to a recipient who is not clearly identified or commissions paid to a company which has every appearance of being a front company.
С укрытием от уплаты налогов тоже хотелось бы увидеть подсказку.
Заранее спасибо.
Ссылки не важны.