How do I enter an HSA contribution that was made in 2018 that I want applied to my 2017 taxes?

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To add, edit, or delete HSA contributions, please review the following:

1. If you are using TurboTax Online, sign in to the appropriate TurboTax account and select Take me to my return. If you are using TurboTax CD/Download, open tax return.
2. In the upper right corner, type "hsa" in the Search/Find/Search Topics (upper middle for Mac) box and then select the "Jump to" link in the search results (no "Jump to" link in Mac).
3. Select Edit on the Your HSA summary screen, if applicable.
4. On the Tell us about the health-related accounts you had in 2017 screen, check the appropriate boxes (these may already be checked from info you entered earlier).
5. On the Did you use your Health Savings Account (HSA) to pay for anything in 2017?, select No and Continue through the screens.
6. On the Let's enter XXX's HSA contributions screen, add, edit, or to delete enter "0" for Any contributions you personally made (not through your employer).

If you are using TurboTax CD/Download and are trying to enter the amount in Forms Mode Windows or Forms Mode Mac, you should enter the amount on Form 8889 Line 2 if the amount was contributed after being taxed. On the other hand, if the amount was deposited through your employer and contributed before being taxed, you should enter the amount on Form 8889 Line 9.