As well known, the Electronic Data Preservation Act (hereinafter referred to as “EDPA“) was originally scheduled to take effect from January 2022. However, the application of this act has been postponed to January 2024. There have been multiple revisions made to this act, which has made it difficult to understand what is mandatory and what has been mitigated. In this article, we will focus on electronic transactions and illustrate their position in the EDPA, and how they can be relevant to your business. The overall relationship between the various tax and accounting documents, and the EDPA can be summarized as shown in the diagram (Exhibit-1) below. As you can see from the diagram (Exhibit-1) above, under the EDPA, it is only electronic data exchanged through electronic transactions that is mandatory to be stored in an electronic manner. This applies not only to the data received, but to the data sent as well. For tax and accounting documents exchanged other than electronic transactions, either conventional hard copy storage or electronic data storage is permitted. So, what are the requirements for this method of electronic storage of all electronic transaction data? Initially, the visibility requirements represented by the truthfulness and retrieval methods were