The present research focused on evaluating the sustainable management of information technology (IT) resources in Brazilian organisations. First, we understood the theoretical context of sustainable IT and investigated the current research initiatives together with existing assessment models. A quantitative survey was conducted among 48 medium and large size Brazilian organisations based on the most appropriated model identified using the theoretical instrument based on the g-readiness model. The responses were then analysed using the five-dimension sustainable IT readiness index with the use of confirmatory factorial analysis, structural equations (partial least squares), and bootstrapping techniques supported by SmartPLS software, among other methods. Data analysis showed a high potential for improvements in sustainable IT management by these organisations with little variation among sectors. Furthermore, the results are in line with those obtained in similar research in the international context, and they were also segmented by the economic activity sectors (primary, secondary, and tertiary).