What Is the National Average Wage Index?

The National Average Wage Index (NAWI) is a measure of U.S. wage trends calculated annually by the Social Security Administration (SSA). The NAWI is dependent on income subject to federal income taxes and contributions to deferred compensation plans. The SSA primarily uses the National Average Wage Index to index retirement and insurance benefits in the United States. It is also used to update several factors in the operation of the Old-Age, Survivors and Disability Insurance (OASDI) program.

Understanding NAWI

The National Average Wage Index provides insight into the direction of wage trends and may alert policymakers to wage inflation; this might impact the Federal Reserve’s decision to raise interest rates. Raising interest rates typically has a negative effect on bond and equity markets and slows inflation. Alternately, if wage inflation is decreasing, the Federal Reserve may lower rates, which helps stimulate the economy and labor market.

National Average Wage Index Calculation

The 2016 National Average Wage Index is calculated by multiplying the 2015 NAWI of $48,098.63 by the percentage change in average wages between 2015 and 2016 (based on the SSA’s average wage data). For example, the 2015 average wage was $46,119.78 and the 2016 average wage was $46,640.94, therefore, the 2016 NAWI is $48,642.15 = ($48,098.63 x $46,640.94 / $46,119.78). The SSA website lists the NAWI between 1951 and the current year.

National Average Wage Index and Wage Indexing

Wage indexing is used by Social Security to adjust an individual’s earning history to inflation. An individual's wages are indexed to the NAWI the year they turn 60. The individual takes the NAWI for the year they turn 60 and divides it by the NAWI for the year they are indexing; they then multiply their included earnings by this number. For example, suppose an individual's 1990 earnings were $30,000. In 2016, the individual turned 60 and the NAWI for that year was $48,642.15. The 2016 NAWI is divided by the 1990 NAWI ($48,642.15 / $21,027.98) to give an index factor of 2.31. The individual’s 1990 earnings are then multiplied by the profit factor to provide that year’s inflation adjusted earnings of $69,300 = ($30,000 x 2.31).

As wage indexing uses the NAWI, an individual cannot work out the exact amount of Social Security they are going to receive until they turn 60. They could estimate the NAWI by taking average wage inflation into account.