Average Indexed Monthly Earnings (AIME)

What Is Average Indexed Monthly Earnings?

Average indexed monthly earnings, or AIME, is the wage-indexed monthly earnings figure Social Security uses to calculate a worker's primary insurance amount. The primary insurance amount is the starting point for determining retirement benefits at full retirement age.

AIME tries to make earnings from different years comparable by indexing earlier wages to national wage growth. That keeps a worker's early-career earnings from being compared directly with later earnings without adjustment.

How AIME Is Calculated

For retirement benefits, Social Security indexes covered earnings, selects the highest 35 years of indexed earnings, adds them, and divides by 420 months. The result is the average indexed monthly earnings figure. The rules can differ for disability and survivor benefits because the worker may not have a full 35-year earnings history.

The formula is not simply a lifetime average of nominal pay. It uses covered earnings subject to Social Security rules and wage indexing. Earnings above the Social Security taxable wage base for a year are not counted above that cap.

Simple Formula

The numerator is the sum of the highest 35 years of indexed covered earnings for a typical retirement calculation. The denominator is 420 because 35 years equals 420 months.

Why AIME Matters

AIME determines the earnings base that is run through the Social Security benefit formula. The primary insurance amount applies progressive bend-point percentages to AIME, replacing a higher share of earnings for lower-wage workers and a lower share for higher-wage workers.

That means an extra year of work can matter most when it replaces a zero or low-earning year in the 35-year calculation. Once a worker already has 35 strong years, another year helps only if it replaces a lower indexed year.

Planning Interpretation

AIME is useful because it turns a complicated earnings record into a planning question: which years count, how strong are they after indexing, and whether future work will replace low years. It also helps explain why Social Security statements can change as earnings records update.

Workers should check their earnings record with Social Security. Missing wages, self-employment reporting issues, or incorrect employer records can affect AIME and future benefits.

Example Planning Use

Suppose a worker has only 32 years of covered earnings. Three zero years may be included in the 35-year retirement calculation, pulling AIME down. Working three additional covered years can replace those zeros and may raise the future benefit more than the same work would for someone who already has 35 high-earning years.

That is why AIME is useful for retirement timing. It helps explain whether another year of work is merely adding one more high year to an already full record or replacing a weak year inside the calculation. The answer can affect claiming decisions, spousal planning, and the value of correcting an inaccurate earnings record.

AIME Versus the Benefit Amount

AIME is not the monthly benefit check. It is the earnings input used to calculate the primary insurance amount. The benefit a person actually receives can then change because of claiming age, delayed retirement credits, early-claiming reductions, cost-of-living adjustments, family benefits, work rules, Medicare premiums, taxation, or survivor-benefit rules.

That distinction prevents a common misunderstanding. Raising AIME can improve the base benefit formula, but the final payment still depends on when and how benefits are claimed. AIME explains the earnings side of Social Security; claiming strategy explains another large part of the household outcome.

The Bottom Line

AIME is the indexed monthly earnings average Social Security uses in the benefit formula. It connects a worker's covered earnings history to the primary insurance amount, making it one of the most important numbers behind retirement, disability, and survivor benefits.