Do you have a Box 12 Code W with an amount? If so, you need to file Form 8889.
- W — Employer contributions (including amounts the employee elected to contribute using a Section 125 cafeteria plan) to your health savings account (HSA).
Please see this answer from BMcCalpin.
Form 8889 reports on your HSA (Health Savings Account) contributions and distributions. It is generated automatically by TurboTax based on answers in the HSA interview and on your W-2, and attached to your 1040 tax return.
If you have a code of W in box 12 on your W-2, then you have an HSA and must add form 8889 to your return. Even if you do not, but have a 1099-SA, then you should do this by going to Federal->Deductions & Credits->Medical->HSA, MSA Contributions, and completing the interview. Be sure to go to the very end, to where you are returned to "Your Tax Breaks".
