How do i view my tax summary for 2018?

Click on Tax Tools on the left side of the screen.  Click on Tools.  Click on View Tax Summary.  The 2018 AGI will be shown

To review your tax summary for 2018, please follow these steps:

1. Log into your TurboTax 
2. Scroll to the bottom of the page, click Add a State( you are not adding a state, this is just to get in the right menu)
3. Over to the left, click Tax Tools dropdown
4. Then, click Tools
5. On the Tools Center screen, click View Tax Summary
6. If you need to view the federal tax summary, over to the left and above Tax Tools, click Federal Tax Summary