This document is a guide that discusses the implications of tech debt in the context of mergers and acquisitions (M&A). It outlines how tech debt can significantly affect a company's long-term performance, particularly regarding innovation and operational flexibility. The guide explains that tech debt arises from technological trade-offs and shortcuts taken during software development, which can lead to increased complexity and maintenance costs. It emphasizes the importance of assessing tech debt during the due diligence phase of M&A to mitigate risks and maximize investment value. The document also details how tech debt can introduce operational and cybersecurity risks, complicating system updates and compliance with regulations. Furthermore, it highlights the need for proactive governance involving IT and business units to manage tech debt effectively. The guide concludes by presenting a dual approach to identifying and managing tech debt, which can enhance the reliability of software assets and optimize value creation throughout the software lifecycle.