Social Security Benefits vs Income

What is the max benefit from social security?

The max benefit is $3,345 per month if retiring at full retirement age in 2022.
To get max benefit, you need to average $147K over your 35 highest years (with some indexing for inflation).  I think this is based on income that is taxed by social security.  Anyone know for sure?   In that case a windfall year wouldn't bump up the average much because it only counts the amount taxed by social security.
Our friends over at gobankingrates offer some additional details.
There are a few sites with benefit calculators.  Interesting that they ask for annual salary and not 'average annual salary for 35 highest earning years'.
SSA has a quick calculator as well,
I didn't find it anywhere, but would like to see a graph of benefits vs income.   Looks like they smooth out the benefits curve.  First bracket of income has 90% replacement factor, then 32% and finally 15%.  So, after a certain salary additional income doesn't increase your benefits much.

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