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Year-on-Year comparisons are used to measure the difference in a data series between the same two time periods. Comparing the current Financial Year to one or more of the previous Financial Years.

Year-on-Year (YoY) is a frequently used calculation to compare two or more data series that can be measured on an annual basis. The time period for the calculation must be stated as it is essential that it is over the same time period. For example, the phrase used could be 1st Quarter YoY Sales Growth. Business conditions for companies in the Retail Sector can be very seasonal. Comparing the same period will assist in mitigating seasonal influences. The data series used in YoY comparisons could be performance data, return on investment or a growth rate, for example Sales. Thus, a YoY comparison could determine if the current year’s performance data or growth rate has improved, remains unchanged, or worsened compared to previous years’ data. Then the question is why, what’s going on?


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Warren William

Meet the author behind Smartest-Data. Warren William has a career in Finance and Investments extending over 35 years, both on the Buy Side and Sell Side. His most recent roles include, developing Institutional Risk Management Programs for managing Equity and Fixed Income Risk.  Prior to this Warren William work in Alternative Investments, in Investment Management and as a Buy Side Equity Analyst. Warren William brings a wealth of knowledge and expertise to the table, providing in-depth analysis and commentary on the latest trends in the Stock Markets. Contact information: or Telegram +393339034488

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