Line 7 on form 6251 in 2021 would be your alternative minimum tax (AMT). Line 15 is used to calculate the AMT using maximum capital gains rates and would flow back to line 7. Line 21 on schedule D would be the net capital loss allowed in 2021, which is limited to $3,000. If you didn't pay alternative minimum tax in 2021 then you can try entering $0 for the amounts requested for lines 7 and 15.
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