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Financial Definition of YOY
What It Is
How It Works
Let's assume Company XYZ's fiscal year began on January 1 and that today is March 31. During this time, Company XYZ recorded the following:
By comparing the 2012 revenues to the 2011 revenues, we can calculate that Company XYZ was up 50% YOY.
Why It Matters
YOY information is useful in looking for trends or measuring performance against goals.
However, remember that comparing YOY information among companies with different fiscal-year start dates can distort an analysis: The time included may vary, and seasonal factors may become skewed. It is also important to remember that the extra day in leap years may also distort comparisons.
Seen and Heard
What made you want to look up YOY? Please tell us where you read or heard it (including the quote, if possible).