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No, I'm already maxed on my SS income and I'm firmly within the 15% LT cap gains tax with and without the cap gains that are driving my tax. 

 

I have $104K in LT Cap gains that are driving my taxes up by almost $25K. When I view the Qualified Dividends and Cap Gains Tax worksheet for both scenarios, my taxable income changed by $15.6K, which is correct as it is 15% of the $104K. I also realize I have another 3.8% tax, adding another $4K (confirmed on Form 8960). That doesn't account for the remaining $5K increase though. Any ideas? Thanks