Yes, the worksheet in Form 8582 does show your correct MAGI. It won't show up in your return, however, unless you have passive losses that are limited because of your MAGI. If you made deductible contributions to your HSA (not excluded from income through your W-2, but contributions made on your own, not through your employer) it would reduce both your AGI and your MAGI. HSA contributions made through your employer are excluded from income and are not included in your AGI or MAGI.
You would generally compute your MAGI manually, starting with the AGI shown on line 11 of Form 1040.
[Edited 05/15/2021|6:29 AM PST]
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