The tax returns for the year 2021 are being prepared now. You can make an HSA contribution in 2022 for tax year 2021 by April 15, 2022. The contribution that you made in 2021 for tax year 2020 would be entered on your 2020 tax return.
If you’re eligible to participate in an HSA, you can contribute right up until April 15, 2021, the expected deadline for filing and paying your 2020 federal income taxes (unless the deadlines changes, as it did in 2020 for 2019 returns).
From the IRS Publication 969
You can make contributions to your HSA for 2021 until April 15, 2022. If you fail to be an eligible individual during 2021, you can still make contributions until April 15, 2022, for the months you were an eligible individual.
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