TurboTax will automatically pull the HSA contribution information from the W-2 section of the program. When you are on the Let's enter your HSA contributions screen, you should only enter contributions that you made on your own (if any) and not those contributions you made via payroll deduction. Payroll contributions are reported on your W-2 in Box 12 with code W. (Click the screenshots below for reference.)
Go back to the W-2 section of TurboTax to enter the Box 12 information. Box 12 can have numerous entries, and you need to enter all of them in TurboTax. The FAQ below provides detailed instructions for entering W-2 Box 12 information.
How do I fill out the Box 12 information from my W-2? https://ttlc.intuit.com/replies/4785646
