Objective. Identify the magnitude of persons' poverty with tuberculosis and his change throughout the ESNT. Methods. Pilot study of a patients' historical cohort deposited the ESNT across socioeconomic evaluations to the moment which the patient joins to the strategy, on having reached the first phase of the treatment and end of the treatment. Results. 45 % of the patients presents extreme poverty, other one 45 % is poor and 9.09 % is not poor, according to NBI. According to value of the familiar basic basket, 76.76 % is in extreme poverty, 18,18 % in poverty and 6.06% is not poor. The extreme poverty increased to the half of the treatment 81.82 % and was kept until the end. The index of Concentration to the beginning of the strategy was 0.24 and to the half and end of the strategy was 0.22. Conclusions. The magnitude of poverty of the persons with tuberculosis increases lightly during his permanency in the ESNT. © 2009.