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It is actually much worse than that I believe. Those last dollars of $125k will cause those dollars to be taxed at much higher than 16% & really cause about $140-$145k to be taxed based on 85% of SS being added to taxable amount. Your 16% estimate is on her entire income which currently most isnt taxed at all.| 2005 -- 2021 (irscalculators.com)
You are correct, the actual RMD funds that make her income over $40k would all be taxed at 22%+