In this study, we estimate informal economy for Ivory Coast, country from subsaharan Africa. We did it through revisiting of main drivers of informal economy in this area. We use MIMIC methodology for done this and follow Dell'Anno and al. (2018) to calibrate estimate score of informal economy to informal economy as a percentage of GDP from 1991 to 2018. We found with strong evidence that Public Government spending, inflation, trade openness explains negatively informal economy and taxation rates, unemployment rates explain positively informal economy. This study has its place, and is welcome as it is difficult for government officials to gather data and to take public macroeconomic policy to lead struggle against informal economy which predominates in Ivory Coast economy at 90%. We build a database on informal economy for Ivory Coast from 1991 to 2018. Following our estimation, we found in 2015 that informal economy represents 26,700,000,000 USD.