You can enter your St-556 purchase information by following these steps in TurboTax Online:

1. Sign into your account and continue your current return

2. Select the search menu on the top right corner

3. Search for Sales Tax and then Select Jump to Sales Tax (see attached image Jump to Sales Tax)

4. A section will come up with your current taxes you will select Continue with Sales Tax if it does not start automatically 

5. Next you will select Easy Guide on How do you want to enter your sales tax? (see attached sales interview page two)

6. You will now enter the state you lived as well as the time frame that you lived there

7. Next enter your sales tax rate and continue

8. The page will ask did you make any major purchases? Select Yes

9. You will now be able to enter your purchase information from your St-556