What is the Average Indexed Monthly Earnings (AIME)?

Average Indexed Monthly Earnings (AIME) is a critical calculation used by the Social Security Administration (SSA) to determine a person's eligibility and the amount of Social Security benefits they are entitled to receive, particularly for retirement, disability, and survivors' benefits. AIME serves as the foundation for calculating the Primary Insurance Amount (PIA), which is the benefit an individual receives at full retirement age (FRA).

To arrive at the AIME, the SSA looks at a person's lifetime earnings, adjusts those earnings for inflation, and then averages them over a certain number of years. This figure is essential for people planning their retirement or those who have become disabled, as it provides a direct correlation between lifetime earnings and future benefit payouts.

The Calculation Process

1. Identifying Covered Earnings

The first step in calculating AIME involves identifying all "covered earnings," which are the wages or self-employment income a person earned while paying into Social Security through payroll taxes. These earnings are subject to an annual limit known as the Social Security wage base. In other words, there's a cap on how much of a person's income is taxed for Social Security in any given year.

2. Indexing for Inflation

Since the dollar has changed in value over time, it's necessary to adjust older earnings to account for inflation. This is done by indexing wages, meaning that earnings from past years are adjusted to reflect current wage levels. This process ensures that older earnings are comparable to more recent wages and reflect the true value of money earned over a lifetime. The SSA uses a formula based on national wage trends to index earnings.

3. Selecting the Highest Earnings Years

Once a person’s earnings have been indexed for inflation, the SSA selects the highest-earning 35 years for most individuals. For people who have worked less than 35 years, the SSA still uses 35 years in its calculations but counts some years as zero if fewer than 35 years of earnings exist. The highest 35 years are averaged to determine the final AIME figure.

4. Averaging Monthly Earnings

The total of the 35 years of indexed earnings is divided by the number of months in those years—420 months in total. The result of this division is the Average Indexed Monthly Earnings (AIME). This figure provides a snapshot of a person’s lifetime average monthly earnings, adjusted for inflation.

AIME and the Primary Insurance Amount (PIA)

After calculating the AIME, the next step is determining the PIA. The PIA is the monthly benefit that an individual is eligible to receive at full retirement age. The Social Security Administration applies a progressive formula to the AIME, which includes "bend points." These bend points determine how much of a person’s AIME is replaced by Social Security benefits, with higher percentages applied to lower portions of income and lower percentages to higher portions.

For instance, as of 2024, the formula for determining the PIA is:

• 90% of the first $1,174 of AIME,
• 32% of the amount between $1,174 and $7,078,
• 15% of any amount over $7,078.

This progressive structure means that people with lower lifetime earnings receive a higher percentage of their income replaced by Social Security, while higher earners receive a smaller percentage of their AIME in benefits.

Factors Impacting AIME

AIME can vary greatly from person to person, based on several factors:

1. Years of Work: A person’s AIME is based on their highest 35 years of earnings. People with fewer than 35 years of earnings will have zero-income years factored into the calculation, which will lower their AIME.
2. Earnings: Higher lifetime earnings naturally result in a higher AIME. Those who earned more throughout their working years will have a larger monthly benefit from Social Security.
3. Inflation: The indexing of wages for inflation ensures that workers who earned money decades ago aren’t penalized due to changes in the value of the dollar. However, because of how wages are indexed, AIME calculations can also reflect broader economic trends in wage growth over time.
4. Non-covered Work: If an individual worked in jobs that didn’t pay into Social Security (such as certain government jobs), those earnings won’t count towards AIME. This can result in a lower AIME for individuals who spent part of their careers in such positions.

AIME and Disability Benefits

While AIME is most commonly associated with retirement benefits, it also plays a key role in determining the amount of Social Security Disability Insurance (SSDI) benefits. For SSDI, the SSA follows a similar process of calculating AIME, but it considers fewer years of earnings (known as the "elapsed years") due to the fact that individuals may become disabled before reaching full retirement age.

Key Points to Remember

• AIME is the average of your highest 35 years of inflation-adjusted earnings.
• It’s a crucial figure in calculating your Social Security benefits, especially retirement and disability benefits.
• AIME is indexed to account for changes in wage levels over time, ensuring fairness in how benefits are calculated across different generations of workers.
• Non-covered earnings (jobs that didn’t pay into Social Security) won’t count toward your AIME, potentially lowering your Social Security benefits.

The Bottom Line

Average Indexed Monthly Earnings (AIME) is a vital metric used by the Social Security Administration to calculate your monthly benefit. It is derived from your lifetime earnings, adjusted for inflation, and averaged over your highest 35 earning years. Whether you're planning for retirement or dealing with disability benefits, understanding how your AIME is calculated can give you a clearer picture of your future Social Security benefits.