It may be for both contributions made by you and your employer:
- W-2 box 12 code W reports both your and your employer's contribution to your Health Savings Account (HSA).
- W-2 box 12 code DD indicates the total cost of what you and your employer paid for your employer-sponsored health coverage plan.
Please see the FAQs below for more information about W-2 Box 12 codes.
What do all the letter codes in Box 12 of my W-2 mean?
https://ttlc.intuit.com/replies/3300234
