"Do I adjust my income amount in the 4th qtr column for a HSA. Contribution pmt in Apr 2024?"
Yes, assuming you remember to tell the HSA custodian that the 2024 contribution is for 2023.
Logically, since the HSA contribution will be for 2023, it must count for the 4th quarter of 2023, which is as close as the contribution can come.
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