In this work, he identifies and models informality in the department of Sucre, comparing the years 2008 and 2014 in his labor market, considering hypotheses such as the size of the firm and by name of employability standards in Colombia, and gathers information from the Great Integrated Household Survey. The study base is based on mincerian functions and these are expanded to measure the productivity of workers, with joint and separate regressions to individuals who report labor income in several cases using categorical variables collecting with a binary effect that approximate to model productivity differences. from the workers of Sucre who would approach them as informal or formal. It was found that, for the study period, companies condition the productive performance of the worker from Sucre, being a firm with low productivity the determinant to the productive condition of an informal worker. It was also found that the firm size hypothesis or effect is explanatory and conditioning changes in the productivity levels of workers in Sucre.