Box 12 with a code of W should have the dollar amount of the sum of the dollars your employer contributed to your HSA plus whatever you contributed by means of payroll deduction.
This amount is removed from Wages in boxes 1, 3, and 5, so it is non-taxable.
If for some or all of this becomes taxable (because of excess contributions), then the taxable amount will appear on line 8f on Schedule 1 (1040), which flows to line 8 on the 1040.
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