Rent-seeking in the trade sector is an outcome of restrictions imposed on tariffs and import quotas by a government. In an effort to acquire more privilege in foreign trade, labor allocates a part of its time-effort to rent-seeking activity, while cutting down on production work. Given the importance of rent-seeking activity due to restrictions imposed by the government in the Iranian economy, this paper has attempted to calculate the size of rent-seeking activity in the foreign trade sector of the Iranian economy. Hence, a version of the DSGE model has been specified and the related parameters have been estimated in order to calculate the rent-seeking rate. We have applied quarterly data from 1998:1 to 2015:4 for Iran’s trade sector, to obtain the empirical results through calibrating the specified DSGE model. The results have indicated that rent-seeking of Iran’s trade sectors amounted to 0.45, which looks considerably high. Moreover, labor has shared 24 % of its effort time to rent-seeking activity and 76 % to ordinary work.