ENThe article aims to present the expenses, and their structure, as incurred by Mikołaj Kiszka, Grand Treasurer of Lithuania, in connection with his participation in the Warsaw Sejm of 1642. The expenses are presented against the background of his income from his own properties and royal estates. The publication also points out the role of the city in which the Sejm was held, mainly Warsaw, as places where the MPs purchased luxury goods, including mainly goldsmiths’ products. A register of Mikołaj Kiszka’s expenses is published in the appendix. Keywords: Mikołaj Kiszka, General Sejm, register of expenses, luxury goods, Grand Duchy of Lithuania. [From the publication]