Open your return and enter your HSA amount shown in Box 12 on your W-2. You could use FORMS mode to do this directly on the W-2 Worksheet.
If it makes a difference in your Refund, then you should Amend your Return.
You don't have to spend the total amount in your HSA account each year.
Here's more info:
https://ttlc.intuit.com/replies/3300505
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