BACKGROUND: The Windfall Elimination Provision ( WEP ) is a formula used to adjust Social Security worker benefits for people who receive “non-covered pensions” and qualify for Social Security benefits based on other Social Security–covered earnings. a A non-covered pension is a pension paid by an employer that does not withhold Social Security taxes from your salary, typically, state and local governments or non- U.S. employers.
Congress passed the WEP to prevent workers who receive non-covered pensions from receiving higher Social Security benefits as if they were long-time, low-wage earners. b In 2022, the WEP applied to 3.1 percent of all beneficiaries (2.01 million beneficiaries out of 65.99 million total beneficiaries).
HOW THE WEP WORKS: Social Security benefits are calculated by applying three different percentages to a person's lifetime average indexed monthly earnings ( AIME ) and adding them up to obtain the worker's monthly benefit (primary insurance amount ( PIA )) at full retirement age. For most beneficiaries in 2024, the PIA equals the sum of:
The WEP PIA replicates the regular PIA but scales down the first percentage from 90 percent to 40 percent in increments of five percentage points for workers with less than 30 years of coverage ( YOC s). Thus, workers with 30 or more YOC s have a first PIA factor of 90 percent, workers with 21–29 YOC s have a first PIA factor between 45–85 percent, and workers with 20 YOC s have a first PIA factor of 40 percent.
However, the difference between the regular PIA and the WEP PIA cannot exceed one-half of the monthly non-covered pension. This provision is known as the WEP guarantee and results in a smaller WEP reduction to the Social Security benefit than otherwise would have applied.