The Catasto is a tax assessment of the inhabitants of Florence and its surrounding territories between 1427 and 1429. In the Catasto, officials listed the wealth, debts, and assets of households in the Republic of Florence. Unlike many premodern tax assessments - which only taxed the rich - the Catasto aimed to include all households within the Republic. To see if indeed all or most inhabitants of Florence are included, we can compare the Catasto with estimates of historical population figures from the Baghad to London dataset. The comparison shows that the Catasto likely underreports the inhabitants of the city of Florence, but the difference is small compared to most other premodern tax assessments – and keeping in mind that the 55k is an estimate.