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@GodFather wrote:

Thank you both.  

If they did make an additional contribution (outside the W2) it would be placed on Line 2, is that correct?

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Yes.  And then the limit is calculated below that.  If you have a partial year (i.e. HDHP coverage started mid-year) do check the specific months at the top but then the client can avail themselves of the "last month rule" as long as their coverage extends the required number of months into 2023.