This report assesses the impact on citizens and businesses of the administrative simplification measures carried out by the Mexican Social Security Institute. Administrative burdens are measured in the time it takes citizens and businesses to complete forms and wait in line to request or deliver information to the government. Using an adaptation of the Standard Cost Model, this report finds that such burdens for users have decreased by at least 25% thanks to the simplification and digitalisation of administrative formalities. It also suggests how the Institute could reduce burdens even further. By promoting the use of online formalities, IMSS could reduce administrative burdens by an additional 11%.