Form 8889 is automatically generated by the tax software if you either (a) withdraw money from an HSA, or (b) contribute money to an HSA, or both.
If you made contributions in 2017 by payroll deduction, they are already reported. If you made out-of-pocket contributions for 2017 (including contributions made before April 15, 2018, if they were specifically designated as "for" 2017), and did not report them, you can file an amended 2017 tax return to take the deduction.
Amend <a rel="nofollow" target="_blank" href="
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