The aim of this exploratory study is to understand the key issues associated with integrating Information Technology (IT) in banking mergers and acquisitions (M&A). The study is undertaken by reviewing a number of high-profile cases and interviewing the IT practitioners who managed the corresponding processes. The result is a comprehensive review of a poorly understood and researched area providing insights into the significance of the IT-related elements in the M&A integration and specifics of the M&A IT integration process. The study concludes by formulating a blueprint layout and integration model describing the timescale, stages, and principles of efficient IT integration. The layout and model can be used by organisations to guide and facilitate the execution of their future banking M&A transactions.