If you’re preparing for the SOA Exam C and want to master loss reserving, getting comfortable with actuarial loss development triangles in Excel is a must. These triangles are fundamental tools for analyzing how insurance claims evolve over time, helping you estimate reserves and understand the behavior of losses from accident years through development periods. Let me walk you through a clear, step-by-step tutorial on creating and interpreting these triangles in Excel, with practical tips to boost your confidence and efficiency.

Creating and interpreting actuarial loss development triangles is a foundational skill for anyone preparing for actuarial exams or working in insurance reserving. These triangles offer a clear, organized way to track how losses emerge and develop over time, providing essential insight into ultimate claim costs. If you’re gearing up for your exam or simply want to understand this better, let me walk you through the process step by step with practical examples and tips.