I have a legal accounting office,

A: It is not permissible for a Muslim to work in stores which deal in Riba (usury) because this is a cooperation in sin and transgression while in a Sahih (authentic) Hadith the Messenger of Allah (peace be upon him) cursed the devourer (taker) of Riba (usury), the one who takes it, its two witnesses and its scribe. (Part No. 15; Page No. 24) Therefore, it is obligatory upon you to leave this work and search for other work which is void of Riba and unlawful gains. These dealings which you have mentioned are usurious because both kinds of Riba (i.e. Riba Al-Fadl (increase) and Riba Al-Nasi'ah (delay)) found therein are prohibited. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.