When I checked this in TurboTax Online and TurboTax CD/Download, I had a different experience than you did on Form 5805. I recommend deleting Form 5805 and first entering the details as described below.
To delete a form in TurboTax Online:
- Go to the left menu and find Tax Tools
- Select Tools and Delete a Form
- Delete the following forms one at a time:
- Form 2210 in the federal return list
- Form 5805 in the California return list
(Forms are deleted from the Forms view in the CD/Download by selecting Delete Form when viewing the form to delete. To find it, first highlight it on the left Forms in My Return.)
Next, return to the Deductions & Credits section and follow these steps:
- Under Estimated Tax Payments, find State Estimated taxes for 2020.
- At the How much did you pay in state estimated taxes? screen, the date paid will be prepopulated for 7/15/2020 for the first and second quarters.
The IRS assesses penalties and interest if either 90% of the current year tax or 100%(110% if your income is above $150,000) of the prior year tax were not paid. It sounds like you may be just fine with the July payment. In case you do need to add the underpayment forms, see this link for more information: How do I add Form 2210?
Form 5805 will generate if you select Yes at the Underpayment Penalty section of the California interview. Otherwise, on your summary page for California, scroll down and click the Edit box by Other situations to return to Form 5805 for Underpayment of Taxes.
