One of the greatest income items of the Grand Duchy of Lithuania were customs – ‘myta’. Initially customs played the role of compensation for using of the real estate such as bridges, dams etc. On the other hand customs were a form of payment for the right of trade license, ownership of the pot-houses (inn), and also for production and sale of the alcoholic drinks. The purpose of the given work is to reflect the activity of the Jewish customs officials as collectors of the customs duties and to show the incomes which were brought by this activity (on the example of the richest Jewish tax-farmer).