The Book Entry Securities Act (ZNVP-1) stipulates that the annual cost of keeping an account and the compensation for the balance maintenance on the trading account kept by a KDD member for a natural person should not exceed 0.5 % of the average value of securities in the account. These, however, are probably not the only fees that the account holder will need to pay. In any case, they represent a significant proportion of the tariffs charged differently by each KDD member.