What is Year Over Year (YOY) in Finance

Year Over Year (YOY) is typically used to compare elements with the same time frames [a period] of two appropriate [similar] periods [normally the same for the previous year]. YoY refers to a way of comparing two or more measurable events in 12 months. For instance, if a firm made $2 million in Q1 2024 and $2.4 million in Q1 2025, the revenue increased by 20% YOY.