The Portuguese Central Credit Register (with the database prior to August 2018 known as the Old CRC) underwent a major revision in September, 2018 and was replaced by a new reporting system (known as the New CRC) which started to collect granular credit data at the instrument level, as framed by ECB’s Regulation (EU) 2016/867 of 18 May 2016 and Banco de Portugal’s Instruction No. 17/2018. The Harmonized Central Credit Responsibility Database (HCRC) aims to build compatible series between the Old CRC and the New CRC by selecting a set of most relevant variables and adopting necessary steps to harmonize the data. The database covers the period from 2009 to 2021 and is now available to researchers. Data constructed at exposure level mimicking the data structure of the Old CRC is only available to internal researchers.