Get your taxes done using TurboTax

To generate CA Form 5808, Underpayment of Estimated Taxes, please follow these steps:

1. If you are going through the interview for the CA return, but haven't yet completed it, you will come to a screen, Underpayment Penalty.  Click the Yes box
2. Continue through the interview, enter the requested information.

1. If you have finished the CA interview, go back into your CA return. 
   
2. On the screen Your 2018 California taxes are ready for us to check, click the Edit box next to Other Situations.
3. In the Other situations section, click Start/Revisit next to Underpayment Penalty.
4. Click Yes on the next screen and continue through the interview.