This paper uses the Russian Longitudinal Monitoring Survey (RLMS) from 1998 to 2004 to analyze the effect of previous informal economy activities on the creation of official entrepreneurship. We find that previous participation in the informal economy is positively associated with the probability to become registered entrepreneurs in the present. We also find that that self-employment is used as a transition mechanism to entrepreneurship and moonlighters in the past are more active in actual job changes. Furthermore, a survival function analysis suggests that previous experience as self-employed moonlighters enhances the probability of success as official entrepreneur. Workers who moonlighted as selfemployed in the past represent 16-22% of the new entrepreneurs.