What is 'Base-Year Analysis'

A base-year analysis includes all layers of analysis concerning economic trends in relation to a specific base year. For example, a base-year analysis could express economic variables relative to base-year prices to eliminate the effects of inflation.

When analyzing a company's financial statements, it is useful to compare current data with that of a previous year or base year. A base-year analysis allows for comparison between current performance and historical performance. With historical context, a business analyst can spot trends helpful when allocating resources to areas requiring additional help or areas experiencing growth.

BREAKING DOWN 'Base-Year Analysis'

Often, a base-year analysis is used when expressing gross domestic product and is known as real GDP when referred to in this way. By eliminating inflation, the trend of economic growth is more accurate, as price level changes are accounted for.

A simple formula would look like: $$ (Base Year) = $$ (Chosen Year) x Price Index (Base Year) / Price Index (Chosen Year)

Why a Base-Year Analysis Matters

A base-year analysis of a company's financial statements is important when determining whether a company is growing or shrinking. If, for example, a company is profitable every year, the fact that its revenues are shrinking year-over-year may go unnoticed. By comparing revenues and profits to those of a previous year, a more detailed picture emerges.

When performing a base-year analysis of any variety, it's important to adjust an analysis for any regime changes. Common regime changes include a range of macro, micro and industry related factors. For example, changes in accounting methods, the tax code, political party control, demographics and social and cultural shifts.

The financial crisis of 2009-2010 is a good example where a base-year analysis that is not adjusted for a regime change is problematic. For instance, in response to sharp declines in housing values, many banks in the U.S. accept government lifelines, as well as changes in accounting methods (Ie. the suspension of market-to-market accounting). An analysis using 2009 as a base-year is going to be overwhelmed by the significant market disruption experienced during that time.

There is no universally accepted "base-year," every analysis will include a different base based on the particulars under review.

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