what do i enter for my hsa contributions from box 12?

If your contribution to your Health Savings Account (HSA) were made through payroll deductions, then they will already be reported on your W-2 in box 12 using code W.  If you made contributions on your own to the HSA, you do not enter those as part of your W-2.  

Contributions made by you directly to the HSA are entered in the 1099-SA/HSA section of your return.  

As you go through this section, look for a screen that asks Did you put money in an HSA in 2024?  Answer 'yes' at the bottom of this screen.  The next screen will show any contributions that were reported on your W-2 in box 12 with code W.  There will also be an input box where you will enter any contributions that you personally made to the account.

Continue through this section to verify that you were eligible to make the contributions and pay attention to any messages on the screen.  

You can go to this section of your return by typing 'HSA' in the search box at the top of the TurboTax screen and clicking the link to 'enter HSA contributions' or 'jump to HSA'.