The AWI is used to change the multiplier of every single year counted towards ones benefit calculation.
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While those born in 1960 are the most affected, the reality is everyone born in 1960 and a few years later are all affected. Basically, if born in 1960, there is a smaller or nonincrease to ones SS (besides COLA) from then on. The die is cast. But if born in 1961 or 2 even, that smaller increase in multiplier is still there, and could in fact be even worse if there is any kind of wage recession the next year, as then two or 3 years years in a row could see lower increases, compounding the flattening of the increase curve.
The real irony is that if this bailout causes inflation down the road, then then those born in 1959 and earlier would see larger net increases in their SS checks (which compounds of course) so two people with identical MAX SS earnings and 35 years counted and claiming age date could see the 1959 born person having a $100/month (or more I suppose) larger check than his financial twin born in 1961, forever.
The numerator for the multiplier calculation is based solely on the average wage in the year someone turns 60. DH and I were born in 1963, so the average wage for 2023 will apply to us for that calculation. From the link I posted earlier:
Benefit Calculation Examples For Workers Retiring In 2020
The indexing factor for a prior year Y is the result of dividing the average wage index for the year in which the person attains age 60 by the average wage index for year Y. For example, the case-A indexing factor for 1980 is the average wage for 2018 ($52,145.80) divided by the average wage for 1980 ($12,513.46).
Two people with identical work history and wages both retire at age 60. Person A turned 60 in 2008. Person B turned 60 in 2009. Average wage for 2008 is $41,334.97. Average wage for 2009 is $40,711.61. Person B is getting less base initial SS because the 2009 numerator is smaller through no fault of his/her own. It results in a multiplier that's slightly smaller than the multiplier for Person A. You're right that COLAs will always be less, compounding the issue.
Person C, also with identical work history and wages, retires in 2010 at age 60, when the average wage is $41,673.83. S/he's getting an even better multiplier than Person A and Person B!
It's not that simple, because no one has identical work history and wages. Thanks to OP for making us aware of this. BTW, I wouldn't count on anything being done to mitigate this. Congress didn't do anything to mitigate the "notch baby" issue, which adversely affected my grandfather. My grandmother always felt bitter about it. An easily readable history of that is here:
The Commission on the Social Security "Notch" Issue
The Commission does not disputeCindeed, it confirmsCthe factual allegations that benefits for many in the "Notch" years tend to be lower than benefits for many of those born in the years just before the "Notch" period and somewhat lower than for some born later. In light of these findings, the perception of those in the "Notch" years that they have been unfairly treated is entirely understandable. Nonetheless, the Commission finds that such is not the case.
There is a significant difference in the benefit levels between those in the "Notch" years and those born in earlier yearsCparticularly those born in the few years just preceding the "Notch" period, and especially for those who worked well beyond age 62. This is the result of a conscious decision by Congress to amend the law in 1977 to reduce initial benefit levels for future retirees starting with those who would reach age 62 in 1979.
Congress made this decision because of a very serious flaw in the benefit computation method that had been a part of the 1972 lawCa flaw that was causing initial benefit levels to increase very rapidly. Without such action, the very viability of the Social Security program would have been undermined.
Important points to note are that the commission admits that mistakes were made in the computation that resulted in people born before 1917 and after 1921 getting more SS than originally intended. They wouldn't reduce SS payments for those already collecting, but they cut future benefits for those who were already 60. Also, remember that file and suspend was eliminated with only 6 months notice for anyone who wasn't yet 62.
Based on these histories, I wouldn't think that an adjustment will be made if the average wage for 2020 is much lower than normal due to the pandemic, or that any consideration will ever be given to those so close to being able to collect SS when they do make adjustments that adversely affect future retirees.